The X-ray luminous cluster underlying the bright radio-quiet quasar H1821+643 (2009)
Russell, H. R., Fabian, A. C., Sanders, J. S., Johnstone, R. M., Blundell, K. M., Brandt, W. N., ...
We present a Chandra observation of the only low redshift, z=0.299, galaxy cluster to contain a highly luminous radio-quiet quasar, H1821+643. By simulating the quasar PSF, we subtract the quasar...
Evidence for relativistic disc reflection in the extreme NLS1 IRAS13224-3809 (2009)
Ponti, G., Gallo, L. C., Fabian, A. C., Miniutti, G., Zoghbi, A., Uttley, P., ...
We present a spectral variability study of the XMM-Newton and Suzaku observations of one of the most extreme Narrow Line Seyfert 1 galaxies, IRAS13224-3809. The X-ray spectrum is characterized by two...
Black hole accretion disks in the canonical low-hard state (2009)
Reis, R. C., Fabian, A. C., Miller, J. M.
Stellar-mass black holes in the low-hard state may hold clues to jet formation and basic accretion disk physics, but the nature of the accretion flow remains uncertain. A standard thin disk can...
Sanders, J. S., Fabian, A. C., Smith, R. K., Peterson, J. R.
We examine deep XMM-Newton Reflection Grating Spectrometer (RGS) observations of the X-ray luminous galaxy cluster A1835. For the first time in a galaxy cluster we place direct limits on turbulent...
Vasudevan, R. V., Fabian, A. C., Gandhi, P., Winter, L. M., Mushotzky, R. F.
The Swift/BAT 9-month catalogue of active galactic nuclei (AGN) provides an unbiased census of local supermassive black hole accretion, and probes to all but the highest levels of absorption in AGN....
Deep high-resolution X-ray spectra from cool-core clusters (2009)
Sanders, J. S., Fabian, A. C., Frank, K. A., Peterson, J. R., Russell, H. R.
We examine deep XMM-Newton Reflection Grating Spectrometer (RGS) spectra from the cores of three X-ray bright cool core galaxy clusters, Abell 262, Abell 3581 and HCG 62. Each of the RGS spectra show...
X-ray reflection in a sample of X-ray bright Ultraluminous X-ray sources (2009)
Caballero-Garcia, M. D., Fabian, A. C.
We apply a reflection-based model to the best available XMM-Newton spectra of X-ray bright UltraLuminous X-ray (ULX) sources (NGC 1313 X-1, NGC 1313 X-2, M 81 X-6, Holmberg IX X-1, NGC 5408 X-1 and...
Measuring the Spin of GRS 1915+105 with Relativistic Disk Reflection (2009)
Blum, J. L., Miller, J. M., Fabian, A. C., Miller, M. C., Homan, J., ...
GRS 1915+105 harbors one of the most massive known stellar black holes in the Galaxy. In May 2007, we observed GRS 1915+105 for 117 ksec in the low/hard state using Suzaku. We collected and analyzed...
Tamura, Takayuki, Maeda, Y., Mitsuda, K., Fabian, A. C., Sanders, J. S., Furuzawa, A., ...
The results from Suzaku observations of the central region of the Perseus cluster are presented. Deep exposures with the X-ray Imaging Spectrometer provide high quality X-ray spectra from the...
Inverse Compton X-rays from Giant Radio Galaxies at z~1 (2009)
Laskar, T., Fabian, A. C., Blundell, K. M., Erlund, M. C.
We report XMM-Newton observations of three FR II radio galaxies at redshifts between 0.85 and 1.34, which show extended diffuse X-ray emission within the radio lobes, likely due to inverse-Compton...
The iron K line complex in NGC 1068: implications for X-ray reflection in the nucleus (2009)
K. Iwasawa, A. C. Fabian, G. Matt
We report a new analysis of ASCA data on the iron K line complex in NGC 1068. The line complex basically consists of three components, as previously reported. A weak red wing of the 6.4 keV...
Heating and Cooling in Clusters and Groups (2009)
The gas in the cores of many clusters and groups of galaxies has a short radiative cooling time. Energy from the central black hole is observed to flow into this gas by means of jets, bubbles and...
An accretion disc origin for the `X-ray broad line region' in 1H0707-495 (2009)
We use a 380 ks XMM-Newton high-resolution RGS spectrum to look for narrow spectral features from the nuclear environment of 1H0707-495. We do not find any evidence of a line-of-sight ionized wind...
Serendipity in Astronomy (2009)
Astronomy is an observationally-led subject where chance discoveries play an important role. A whole range of such discoveries is continually made, from the trivial to the highly significant. What is...
Constraining the Spin of the Black Hole in Fairall 9 with Suzaku (2009)
Schmoll, S., Miller, J. M., Volonteri, M., Cackett, E., Reynolds, C. S., Fabian, A. C., ...
We report on the results of spectral fits made to data obtained from a 168 ksec Suzaku observation of the Seyfert-1 galaxy Fairall 9. The source is clearly detected out to 30 keV. The observed...
Vasudevan, R. V., Mushotzky, R. F., Winter, L. M., Fabian, A. C.
(Abridged) We present simultaneous optical--to--X-ray spectral energy distributions (SEDs) from Swift's X-ray and UV--optical telescopes (XRT and UVOT) for a well-selected sample of 26 low-redshift (z
The role of black holes in galaxy formation and evolution (2009)
Cattaneo, A., Faber, S. M., Binney, J., Dekel, A., Kormendy, J., Mushotzky, R., ...
Virtually all massive galaxies, including our own, host central black holes ranging in mass from millions to billions of solar masses. The growth of these black holes releases vast amounts of energy...
Massive black holes are ubiquitous, occurring at the centres of all massive galaxies and possibly many low mass ones. They are no ornament which just happens to be there, but play a role vital to the...
A Compton-thick Wind in the High Luminosity Quasar, PDS 456 (2009)
Reeves, J. N., O'Brien, P. T., Braito, V., Behar, E., Miller, L., Turner, T. J., ...
PDS 456 is a nearby (z=0.184), luminous (L_bol ~10^47 erg/s) type I quasar. A deep 190 ks Suzaku observation in February 2007 revealed the complex, broad band X-ray spectrum of PDS 456. The Suzaku...
Fabian, A. C., Zoghbi, A., Ross, R. R., Uttley, P., Gallo, L. C., Brandt, W. N., ...
Since the discovery of the first broad iron-K line in 1995 from the Seyfert Galaxy MCG--6-30-15, broad iron-K lines have been found in several other Seyfert galaxies, from accreting stellar mass...
Miniutti, G., Panessa, F., De Rosa, A., Fabian, A. C., Malizia, A., Molina, M., ...
We have observed the hard X-ray selected Narrow-Line Seyfert 1 galaxy SWIFT J2127.4+5654 with Suzaku. We report the detection of a broad relativistic iron emission line from the inner accretion disc....
PHL 1092 as a transient extreme X-ray weak quasar (2009)
Miniutti, G., Fabian, A. C., Brandt, W. N., Gallo, L. C., Boller, Th.
We report a dramatic variability event in the X-ray history of the Narrow-Line quasar PHL 1092 (z=0.396). Our latest 2008 XMM-Newton observation reveals a flux drop of ~200 with respect to the...
Reis, R. C., Fabian, A. C., Young, A. J.
The X-ray spectra of accreting compact objects often exhibit discrete emission features associated with fluorescent emission in the accretion disk, the strongest of which is the Fe Kalpha...
Feedback through multiple outbursts in the cluster 2A 0335+096 (2009)
Sanders, J. S., Fabian, A. C., Taylor, G. B.
We examine the core of the X-ray bright galaxy cluster 2A 0335+096 using deep Chandra X-ray imaging and spatially-resolved spectroscopy, and include new radio observations. The set of around eight...
Radio constraints on the volume filling factors of AGN winds (2009)
The calculation of mass outflow rates of AGN winds is of great importance in understanding the role that such winds play in AGN-galaxy feedback processes. The mass outflow rates are, however,...
Eddington ratio and accretion efficiency in AGN evolution (2009)
Raimundo, S. I., Fabian, A. C.
The cosmological evolution of Active Galactic Nuclei (AGN) is important for understanding the mechanism of accretion onto supermassive black holes, and the related evolution of the host galaxy. In...
The Growth of Supermassive Black Holes Across Cosmic Time (2009)
Nandra, K., Aird, J. A., Alexander, D. M., Ballantyne, D. R., Barcons, X., Bauer, F. E., ...
One of the main themes in extragalactic astronomy for the next decade will be the evolution of galaxies over cosmic time. Many future observatories, including JWST, ALMA, GMT, TMT and E-ELT will...
Fabian, A. C., Chapman, S., Casey, C. M., Bauer, F., Blundell, K. M.
One of the six extended X-ray sources found in the Chandra DeepField North is centred on HDF130, which has recently been shown to be a massive galaxy at z=1.99 with a compact radio nucleus. The X-ray...
Stellar-mass Black Hole Spin Constraints from Disk Reflection and Continuum Modeling (2009)
Miller, J. M., Reynolds, C. S., Fabian, A. C., Miniutti, G., Gallo, L. C.
Accretion disk reflection spectra, including broad iron emission lines, bear the imprints of the strong Doppler shifts and gravitational red-shifts close to black holes. The extremity of these shifts...
Thermal emission from the stellar-mass black hole binary XTE J1118+480 in the low/hard state (2009)
Reis, R. C., Miller, J. M., Fabian, A. C.
We report on the detection of a thermal-disk component from the stellar-mass black hole binary XTE J1118+480 in the canonical low/hard state. The presence of a thermal component with a temperature of...
Determining the spin of two stellar-mass black holes from disk reflection signatures (2009)
Reis, R. C., Fabian, A. C., Ross, R. R., Miller, J. M.
We present measurements of the dimensionless spin parameters and inner-disk inclination of two stellar mass black holes. The spin parameter of SWIFT J1753.5-0127 and GRO J1655-40 are estimated by...
XMM-Newton and Suzaku analysis of the Fe K complex in the Seyfert 1 galaxy Mrk 509 (2009)
Ponti, G., Cappi, M., Vignali, C., Miniutti, G., Tombesi, F., Dadina, M., ...
We report on partially overlapping XMM-Newton (~260 ks) and Suzaku (~100 ks) observations of the iron K band in the nearby, bright Seyfert 1 galaxy Mrk 509. The source shows a resolved neutral Fe K...
Radiation pressure and absorption in AGN: results from a complete unbiased sample from Swift (2009)
Fabian, A. C., Vasudevan, R. V., Mushotzky, R. F.
Outward radiation pressure can exceed the inward gravitational pull on gas clouds in the neighbourhood of a luminous Active Galactic Nucleus (AGN). This creates a forbidden region for long-lived...
The XMM–Newton view of AGN with intermediate-mass black holes (2009)
Miniutti, G., Ponti, G., Greene, J. E., Ho, L. C., Fabian, A. C., Iwasawa, K.
Broad line emission from iron K- and L-shell transitions in the active galaxy 1H 0707-495 (2009)
Fabian, A. C., Zoghbi, A., Ross, R. R., Uttley, P., Gallo, L. C., Brandt, W. N., ...
PHL 1092 as a transient extreme X-ray weak quasar (2009)
Miniutti, G., Fabian, A. C., Brandt, W. N., Gallo, L. C., Boller, Th.
Constraining the spin of the black hole in Fairall 9 with Suzaku (2009)
Schmoll, S., Miller, J. M., Volonteri, M., Cackett, E., Reynolds, C. S., Fabian, A. C., ...
The XMM-Newton view of AGN with intermediate mass black holes (2008)
Miniutti, G., Ponti, G., Greene, J. E., Ho, L. C., Fabian, A. C., Iwasawa, K.
We have observed with XMM-Newton four radiatively efficient active type 1 galaxies with black hole masses < 10^6 Msun, selected optically from the SDSS. We show here that their soft X-ray spectrum...
The high-energy emission from GX 339-4 as seen with INTEGRAL and XMM-Newton (2008)
Caballero-Garcia, M. D., Miller, J. M., Fabian, A. C.
GX 339--4 is a well-known microquasar. In this contribution we show the obtained results with the INTEGRAL and XMM-Newton observatories of the outburst undertaken on 2007. The observations cover...
X-Ray Spectral Variability of the Seyfert Galaxy NGC 4051 Observed with Suzaku (2008)
Terashima, Y., Gallo, L. C., Inoue, H., Markowitz, A. G., Reeves, J. N., Anabuki, N., ...
We report results from a Suzaku observation of the narrow-line Seyfert 1 NGC 4051. During our observation, large amplitude rapid variability is seen and the averaged 2--10 keV flux is 8.1x10^-12 erg...
Giant cavities, cooling and metallicity substructure in Abell 2204 (2008)
Sanders, J. S., Fabian, A. C., Taylor, G. B.
We present results from deep Chandra and XMM-Newton observations of the relaxed X-ray luminous galaxy cluster Abell 2204. We detect metallicity inhomogeneities in the intracluster medium on a variety...
The Chandra Deep Field-South Survey: 2 Ms Source Catalogs (2008)
Luo, B., Bauer, F. E., Brandt, W. N., Alexander, D. M., Lehmer, B. D., Schneider, D. P., ...
We present point-source catalogs for the ≈2 Ms exposure of the Chandra Deep Field-South (CDF-S); this is one of the two most sensitive X-ray surveys ever performed. The survey covers an area of...
Caballero-Garcia, M. D., Miller, J. M., Trigo, M. Diaz, Kuulkers, E., Fabian, A. C., Mas-Hesse, J. M., ...
We present simultaneous XMM-Newton and INTEGRAL observations of the luminous black hole transient and relativistic jet source GX 339-4. GX 339-4 started an outburst on November of 2006 and our...
Collisional heating as the origin of filament emission in galaxy clusters (2008)
Ferland, G. J., Fabian, A. C., Hatch, N. A., Johnstone, R. M., Porter, R. L., ...
[Abridged] Photoionization, whether by starlight or other sources, has difficulty in accounting for the observed spectra of the optical filaments that often surround central galaxies in large...
Vasudevan, R. V., Fabian, A. C.
We employ contemporaneous optical, UV and X-ray observations from the XMM-Newton EPIC-pn and Optical Monitor (OM) archives to present, for the first time, simultaneous spectral energy distributions...
Zoghbi, A., Fabian, A. C., Gallo, L. C.
Multi-epoch XMM-Newton spectra of the two Narrow Line Seyfert 1 (NLS1), Mrk 478 and EXO 1346.2+2645, are presented. The data were fitted with different models, including the relativistically-blurred...
Magnetic support of the optical emission line filaments in NGC 1275 (2008)
Fabian, A. C., Johnstone, R. M., Sanders, J. S., Conselice, C. J., Crawford, C. S., Gallagher III, J. S., ...
The giant elliptical galaxy NGC 1275, at the centre of the Perseus cluster, is surrounded by a well-known giant nebulosity of emission-line filaments, which are plausibly about >10^8 yr old. The...
Direct X-ray Spectral Deprojection of Galaxy Clusters (2008)
Russell, H. R., Sanders, J. S., Fabian, A. C.
Temperature, density and abundance profiles of the hot intracluster medium (ICM) are important diagnostics of the complex interactions of gravitational and feedback processes in the cores of galaxy...
Sound waves in the intracluster medium of the Centaurus cluster (2008)
We report the discovery of ripple-like X-ray surface brightness oscillations in the core of the Centaurus cluster of galaxies, found with 200 ks of Chandra observations. The features are between 3 to...
Detecting Sound-Wave-Like Surface Brightness Ripples in Cluster Cores (2008)
Graham, J., Fabian, A. C., Sanders, J. S.
We investigate the observational requirements for the detection of sound-wave-like features in galaxy cluster cores. We calculate the effect of projection on the observed wave amplitude, and find...
Electron-ion coupling in rapidly varying sources (2008)
Summary. The Thomson depth of sources radiating at the efficiency limit must lie near unity. This allows us to deduce a general condition on the maximum electron temperature attainable in such a...
Gandhi, P., Makishima, K., Durant, M., Fabian, A. C., Dhillon, V. S., Marsh, T. R., ...
We present the discovery of optical/X-ray flux correlations on rapid timescales in the low/hard state of the Galactic black hole GX 339-4. The source had recently emerged from outburst and was...
The Chandra Deep Field-South Survey: 2 Ms Source Catalogs (2008)
Luo, B., Bauer, F. E., Brandt, W. N., Alexander, D. M., Lehmer, B. D., Schneider, D. P., ...
We present point-source catalogs for the ~2 Ms exposure of the Chandra Deep Field-South (CDF-S); this is one of the two most-sensitive X-ray surveys ever performed. The survey covers an area of ~436...
Exploring the disc/jet interaction in the radio-loud quasar 4C +74.26 with Suzaku (2008)
Larsson, J., Fabian, A. C., Ballantyne, D. R., Miniutti, G.
We report on a 90 ks Suzaku observation of the radio-loud quasar 4C +74.26. The source was observed in its highest flux state to date, and we find that it brightened by about 20 per cent during the...
Cold gas in the Perseus cluster core: Excitation of molecular gas in filaments (2008)
Salomé, P., Combes, F., Revaz, Y., Edge, A. C., Hatch, N. A., Fabian, A. C., ...
We have recently detected CO lines in the well-known filaments around NGC 1275, the galaxy at the centre of the Perseus cluster of galaxies. These previous observations, with the HERA multi-beam...
Observations of CO in the eastern filaments of NGC 1275 (2008)
Salomé, P., Revaz, Y., Combes, F., Pety, J., Downes, D., Edge, A. C., ...
We recently found extended CO(2-1) emission from cold molecular gas embedded in the network of Halpha filaments surrounding the galaxy NGC 1275 (Salome et al. 2006). We now present CO(2-1)...
Reis, R. C., Fabian, A. C., Ross, R., Miniutti, G., Miller, J. M., Reynolds, C.
We present a systematic study of GX 339-4 in both its very high and low hard states from simultaneous observations made with XMM-Newton and RXTE in 2002 and 2004. The X-ray spectra of both these...
The inverse-Compton X-ray-emitting lobes of the high-redshift giant radio galaxy 6C 0905+39 (2008)
Erlund, M. C., Fabian, A. C., Blundell, Katherine M.
We present new XMM-Newton data of the high-redshift (z=1.883), Mpc-sized giant radio galaxy 6C 0905+39. The larger collecting area and longer observation time for our new data means that we can...
Initial Measurements of Black Hole Spin in GX 339-4 from Suzaku Spectroscopy (2008)
Miller, J. M., Reynolds, C. S., Fabian, A. C., Cackett, E. M., Miniutti, G., Raymond, J., ...
We report on a deep Suzaku observation of the stellar-mass black hole GX 339-4 in outburst. A clear, strong, relativistically-shaped iron emission line from the inner accretion disk is observed. The...
The origin of molecular hydrogen emission in cooling-flow filaments (2008)
Ferland, G. J., Fabian, A. C., Hatch, N. A., Johnstone, R. M., Porter, R. L., ...
The optical filaments found in many cooling flows in galaxy clusters consist of low density ($\sim 10^3 \pcc$) cool ($\sim 10^3$ K) gas surrounded by significant amounts of cosmic-ray and...
The Accretion Disk Wind in the Black Hole GRO J1655-40 (2008)
Miller, J. M., Raymond, J., Reynolds, C. S., Fabian, A. C., Kallman, T. R., Homan, J.
We report on simultaneous Chandra/HETGS and RXTE observations of the transient stellar-mass black hole GRO J1655-40, made during its 2005 outburst. Chandra reveals a line-rich X-ray absorption...
The Weak Shock in the Core of the Perseus Cluster (2008)
Graham, J., Fabian, A. C., Sanders, J. S.
The dissipation of energy from sound waves and weak shocks is one of the most promising mechanisms for coupling AGN activity to the surrounding intracluster medium (ICM), and so offsetting cooling in...
The Compton-thick quasar at the heart of the high-redshift giant radio galaxy 6C 0905+39 (2008)
Erlund, M. C., Fabian, A. C., Blundell, Katherine M., Crawford, Carolin S.
Our XMM-Newton spectrum of the giant, high-redshift (z=1.88) radio galaxy 6C 0905+39 shows that it contains one of the most powerful, high-redshift, Compton-thick quasars known. Its spectrum is very...
Investigating Heating and Cooling in the BCS & B55 Cluster Samples (2008)
We study clusters in the BCS cluster sample which are observed by Chandra and are more distant than redshift, z>0.1. We select from this subsample the clusters which have both a short central cooling...
XMM-Newton observations of the Lockman hole: X-ray source catalogue and number counts (2008)
Brunner, H., Cappelluti, N., Hasinger, G., Barcons, X., Fabian, A. C., Mainieri, V., ...
The Chandra deep field-south survey: 2 Ms source catalogs (2008)
Luo, B., Bauer, F. E., Brandt, W. N., Alexander, D. M., Lehmer, B. D., Schneider, D. P., ...
Suzaku observations of Markarian 335: evidence for a distributed reflector (2007)
Larsson, J., Miniutti, G., Fabian, A. C., Miller, J. M., Reynolds, C. S., Ponti, G.
We report on a 151 ks net exposure Suzaku observation of the Narrow Line Seyfert 1 galaxy Mrk 335. The 0.5-40 keV spectrum contains a broad Fe line, a strong soft excess below about 2 keV and a...
The effect of radiation pressure on dusty absorbing gas around AGN (2007)
Fabian, A. C., Vasudevan, R. V., Gandhi, P.
Many Active Galactic Nuclei (AGN) are surrounded by gas which absorbs the radiation produced by accretion onto the central black hole and obscures the nucleus from direct view. The dust component of...
Barcons, Xavier, Carrera, Francisco J., Ceballos, María Teresa, Page, M. J., Bussons-Gordo, Javier, Corral, Amalia, ...
13 pages, 6 figures, 7 tables.-- ISI Article Identifier: 000251507500014.-- ArXiv pre-print available at: http://arxiv.org/abs/0710.0402
XMM-Newton observations of the Lockman Hole: X-ray source catalogue and number counts (2007)
Brunner, H., Cappelluti, N., Hasinger, G., Barcons, X., Fabian, A. C., Mainieri, V., ...
The Lockman Hole field represents the sky area of lowest Galactic line-of-sight column density N_H=5.7X10^19 cm^-2. It was observed by the XMM-Newton X-ray observatory in 18 pointings for a total of...
S. Ettori, S. W. Allen, A. C. Fabian
We present an analysis of BeppoSAX observations of three clusters of galaxies which are amongst the most luminous in the Universe: RXJ1347-1145, Zwicky 3146 and Abell 2390. Using data from both the...
Broad iron lines in Active Galactic Nuclei (2007)
A. C. Fabian, K. Iwasawa, A. J. Young
An intrinsically narrow line emitted by an accretion disk around a black hole appears broadened and skewed as a result of the Doppler eect and gravitational redshift. The uorescent iron line in the...
PSPC observations of 36 high-luminosity clusters of galaxies: constraints on the gas fraction (2007)
Ettori And Fabian, S. Ettori, A. C. Fabian, Erg S
We present a detailed and homogeneous analysis of the ROSAT PSPC surface brightness proles of 36 clusters of galaxies with high X-ray luminosity (LX > 10 45 erg s 1 ) and redshifts between 0.05...
Testing the connection between the X-ray and submillimetre source populations using . . . (2007)
A. C. Fabian, Ian Smail, S.W. Allen, K. Iwasawa, A. W. Blain, ...
The powerful combination of the Chandra X-ray telescope, the SCUBA submillimetre-wave camera and the gravitational lensing effect of the massive galaxy clusters A 2390 and A 1835 has been used to...
constraints on the thermal conduction in the intracluster plasma of A2142 (2007)
Ettori And Fabian, S. Ettori, A. C. Fabian
In this Letter, we use the recent Chandra observation of Abell 2142 reported by Markevitch et al. to put constraints on thermal conduction in the intracluster plasma. We show that the observed sharp...
The outer regions of the Perseus cluster of galaxies: a ROSAT PSPC look (2007)
Ettori And Fabian, S. Ettori, A. C. Fabian
. We report on the results of surveying the cluster out to radii of 80 arcmin ( 2:4 Mpc) using a mosaic of four off-axis, ROSAT PSPC observations of the Perseus cluster of galaxies (Abell 426). A...
S. Ettori, A.C. Fabian and D.A. White (2007)
S. Ettori, A. C. Fabian, D. A. White, Erg S
We present an analysis of four off-axis ROSAT PSPC observations of the Perseus cluster of galaxies (Abell 426). We detect the surface brightness profile to a radius of 80 arcmin ( 2:4h \Gamma1 50...
Constraints on the Gas Fraction From (2007)
Rosat Pspc Observations, S. Ettori, A. C. Fabian, Erg S
We present a detailed and homogeneous analysis of the ROSAT PSPC surface brightness profiles of 36 clusters of galaxies with high X-ray luminosity (LX ? 10 45 erg s \Gamma1 ) and redshifts between...
SN 1988Z: Spectro-photometric catalogue and energy estimates (2007)
Itziar Aretxaga, S. Benetti, R. J. Terlevich, A.C. Fabian, E. Cappellaro, M. Turatto, ...
We present a spectro-photometric catalogue of the evolution of supernova 1988Z which combines new and published observations in the radio, optical and X-ray bands, with the aim of oering a...
The X-ray properties of Cygnus-A (2007)
By Reynolds, C. S. Reynolds, A. C. Fabian
this article we briefly review the observations leading to our current picture of this system (Section 2). We then present the results of a ROSAT Position Sensitive Proportional Counter (PSPC)...
The inner accretion disk in M87 (2007)
Reynolds Di, C. S. Reynolds, T. Di Matteo, A. C. Fabian, Erg S
. The observed AGN in M87 is extremely quiescent compared to expectations based upon simple estimates for the mass accretion rate. We examine the possibility that the final stages of accretion are...
observations of the Seyfert 1 galaxies Mrk 1040 and MS 0225.5+3121 (2007)
Reynolds Fabian, C. S. Reynolds, A. C. Fabian, H. Inoue
We present ASCA observations of the Seyfert 1 galaxies Mrk 1040 and MS 0225.5+3121. Mrk 1040 was found to have decreased in flux by almost a factor of 4 since an EXOSAT observation 10 years ago. The...
Warm absorbers in active galactic nuclei (2007)
Recent ASCA observations confirm the presence of X-ray absorption due to partially ionized gas in many Seyfert 1 galaxies; the so-called warm absorber. Constraints on the location of the warm...
Special relativistic effects on the strength of the fluorescent Kff iron line from black hole accretion disks.
C. S. Reynolds, A. C. Fabian, A. Celotti
We present a multiwaveband spectroscopic study of the nearby Seyfert 1 galaxy MCG\Gamma6-30-15. New optical spectra from the Anglo-Australian Telescope are presented which clearly show the effects of...
C. S. Reynolds, A. C. Fabian, K. Nandra, H. Inoue, H. Kunieda, K. Iwasawa
ASCA PV observations of the Seyfert 1 galaxy MCG\Gamma6\Gamma30\Gamma15: rapid variability of the warm absorber.
C. S. Reynolds, C. S. Crawford, A. C. Fabian
We present an ASCA observation of the broad line radio galaxy 3C 111. The Xray spectrum is well described by a model consisting of a photoelectrically-absorbed power-law form. The inferred absorbing...
C. S. Reynolds, T. Di Matteo, A. C. Fabian, U. Hwang, C. R. Canizares
It is believed that most giant elliptical galaxies possess nuclear black holes with masses in excess of 10 8 M fi. Bondi accretion from the interstellar medium might then be expected to produce...
C. S. Reynolds, A. C. Fabian, A. Celotti, M. J. Rees
matter content of the jet in M87: evidence for an electron-positron jet
ROSAT PSPC observations of Cygnus-A: X-ray spectra of the cooling flow and hot spots. (2007)
We present a ROSAT Position Sensitive Proportional Counter (PSPC) observation of the powerful radio galaxy Cygnus-A. The X-ray emission in the ROSAT band is dominated by thermal emission from the hot...
C. S. Reynolds, A. J. Loan, A. C. Fabian, K. Makishima, W. N. Br, T. Mizuno
We present ASCA observations of the nearby galaxies Dwingeloo 1 (Dw1) and Maffei 1 (Mf1). X-ray sources are clearly detected within 3 arcminutes of the optical nuclei of both galaxies. Despite the...
XMM-Newton and Broad Iron Lines (2007)
Iron line emission is common in the X-ray spectra of accreting black holes. When the line emission is broad or variable then it is likely to originate from close to the black hole. X-ray irradiation...
Cool X-ray emitting gas in the core of the Centaurus cluster of galaxies (2007)
Sanders, J. S., Fabian, A. C., Allen, S. W., Morris, R. G., Graham, J., Johnstone, R. M.
We use a deep XMM-Newton Reflection Grating Spectrometer observation to examine the X-ray emission from the core of the Centaurus cluster of galaxies. We clearly detect Fe-XVII emission at four...
Caballero García, María Dolores, Miller, J. M., Kuulkers, E., Trigo, M. D., Homan, J., Lewin, W. H. G., ...
12 pages, 10 figures, 3 tables.-- ISI Article Identifier: 000250480600041.-- ArXiv pre-print available at: http://arxiv.org/abs/0706.1302
The Suzaku Observation of NGC 3516: Complex Absorption and the Broad and Narrow Fe K Lines (2007)
Markowitz, A., Reeves, J. N., Miniutti, G., Serlemitsos, P., Kunieda, H., Yaqoob, T., ...
We present results from a 150 ksec Suzaku observation of the Seyfert 1.5 NGC 3516 in October 2005. The source was in a relatively highly absorbed state. Our best-fit model is consistent with the...
Barcons, X., Carrera, F. J., Ceballos, M. T., Page, M. J., Bussons-Gordo, J., Corral, A., ...
We present the XMM-Newton Medium sensitivity Survey (XMS), including a total of 318 X-ray sources found among the serendipitous content of 25 XMM-Newton target fields. The XMS comprises four largely...
Constraints on light bending and reflection from the hard X-ray background (2007)
Gandhi, P., Fabian, A. C., Suebsuwong, T., Malzac, J., Miniutti, G., Wilman, R. J.
Light bending due to strong gravity has recently been invoked to explain variability and flux correlations between different bands in some accreting black holes. A characteristic feature of light...
X-ray active galactic nuclei in the core of the Perseus cluster (2007)
Santra, S., Sanders, J. S., Fabian, A. C.
We present a study of the X-ray emission from the nuclei of galaxies observed in the core of the Perseus cluster in a deep exposure with Chandra. Point sources are found coincident with the nuclei of...
X-ray reflection in accreting stellar-mass black hole systems (2007)
The X-ray spectra of accreting stellar-mass black hole systems exhibit spectral features due to reflection, especially broad iron K alpha emission lines. We investigate the reflection by the...
Piecing Together the X-ray Background: Bolometric Corrections for Active Galactic Nuclei (2007)
Vasudevan, R. V., Fabian, A. C.
(Abridged) The X-ray background can be used to constrain the accretion history of Supermassive Black Holes (SMBHs) in Active Galactic Nuclei (AGN). A knowledge of the hard X-ray bolometric...
Fields and Filaments in the Core of the Centaurus Cluster (2007)
Taylor, G. B., Fabian, A. C., Gentile, G., Allen, S. W., Crawford, C., Sanders, J. S.
We present high resolution images of the Faraday Rotation Measure (RM) structure of the radio galaxy PKS 1246-410, at the center of the Centaurus cluster. Comparison with Halpha-line and soft X-ray...
XMM-Newton observations of the Lockman Hole V: time variability of the brightest AGN (2007)
Mateos, S., Barcons, X., Carrera, F. J., Page, M. J., Ceballos, M. T., Hasinger, G., ...
This paper presents the results of a study of X-ray spectral and flux variability on time scales from months to years, of the 123 brightest objects (including 46 type-1 AGN and 28 type-2 AGN)...
Caballero-Garcia, M. D., Miller, J. M., Kuulkers, E., Trigo, M. Diaz, Homan, J., Lewin, W. H. G., ...
We present broadband (3-500 keV) INTEGRAL X-ray spectra and X-ray/optical light curves of the luminous black hole X-ray transient and relativistic jet source GRO J1655-40. Our analysis covers four...
Ionized nebulae surrounding brightest cluster galaxies (2007)
Hatch, N. A., Crawford, C. S., Fabian, A. C.
We present IFU observations of six emission-line nebulae that surround the central galaxy of cool core clusters. Qualitatively similar nebulae are observed in cool core clusters even when the...
Allen, S. W., Rapetti, D. A., Schmidt, R. W., Ebeling, H., Morris, G., Fabian, A. C.
We present constraints on the mean matter density, Omega_m, dark energy density, Omega_de, and the dark energy equation of state parameter, w, using Chandra measurements of the X-ray gas mass...
We make a further study of the very deep Chandra observation of the X-ray brightest galaxy cluster, A426 in Perseus. We examine the radial distribution of energy flux inferred by the quasi-concentric...
The luminous X-ray hotspot in 4C 74.26: synchrotron or inverse-Compton emission? (2007)
Erlund, M. C., Fabian, A. C., Blundell, Katherine M., Moss, C., Ballantyne, D. R.
We report the discovery of an X-ray counterpart to the southern radio hotspot of the largest-known radio quasar 4C 74.26 (whose redshift is z=0.104). Both XMM-Newton and Chandra images reveal the...
A longer XMM-Newton look at I Zwicky 1: Distinct modes of X-ray spectral variability (2007)
Gallo, L. C., Brandt, W. N., Costantini, E., Fabian, A. C.
The short-term spectral variability of the narrow-line Seyfert 1 galaxy I Zwicky 1 (I Zw 1) as observed in an 85 ks XMM-Newton observation is discussed in detail. I Zw 1 shows distinct modes of...
Costantini, E., Gallo, L. C., Brandt, W. N., Fabian, A. C., Boller, Th.
We present a spectral analysis of the narrow-line Seyfert 1 galaxy I Zwicky 1, focusing on the characteristics of the ionised absorbers as observed with XMM-Newton in 2005. The soft X-ray spectrum...
Exploring the X-ray spectral variability of MCG-6-30-15 with XMM-Newton (2007)
Larsson, J., Fabian, A. C., Miniutti, G., Ross, R. R.
We present a study of the spectral variability of the Seyfert I galaxy MCG-6-30-15 based on the two long XMM-Newton observations from 2000 and 2001. The X-ray spectrum and variability properties of...
XMM-Newton observations of the Lockman Hole - V. Time variability of the brightest AGN (2007)
Mateos, S., Barcons, X., Carrera, F. J., Page, M. J., Ceballos, M. T., Hasinger, G., ...
García, M.D. Caballero, Miller, J.M., Kuulkers, E., Trigo, M. Díaz, Homan, J., Lewin, W.H.G., ...
We present broadband (3-500 keV) INTEGRAL X-ray spectra and X-ray/optical light curves of the luminous black hole X-ray transient and relativistic jet source GRO J1655-40. Our analysis covers four...
Heating and cooling in the Perseus cluster core (2006)
It is well known that the radiative cooling time of the hot X-ray emitting gas in the cores of most clusters of galaxies is less than 10^10 yr. In many clusters the gas temperature also drops towards...
Strong gravity effects: X-ray spectra, variability and polarimetry (2006)
Accreting black holes often show iron line emission in their X-ray spectra. When this line emission is very broad or variable then it is likely to originate from close to the black hole. The theory...
We use a very deep 900 ks Chandra X-ray observation of the core of the Perseus cluster to measure and confirm the hard X-ray emission detected from a previous analysis. By fitting a model made up of...
Suzaku Observations of Iron Lines and Reflection in AGN (2006)
Reeves, J. N., Fabian, A. C., Kataoka, J., Kunieda, H., Markowitz, A., Miniutti, G., ...
Initial results on the iron K-shell line and reflection component in several AGN observed as part of the Suzaku Guaranteed time program are reviewed. This paper discusses a small sample of...
Gallo, L. C., Brandt, W. N., Costantini, E., Fabian, A. C., Iwasawa, K., Papadakis, I. E.
We present the second XMM-Newton observation (85 ks) of the narrow-line Seyfert 1 galaxy (NLS1) I Zw 1 and describe its mean spectral and timing characteristics. On average, I Zw 1 is ~35 per cent...
Investigating AGN Heating in a Sample of Nearby Clusters (2006)
We analyse those objects in the Brightest 55 sample of clusters of galaxies which have a short central cooling time and a central temperature drop. Such clusters are likely to require some form of...
Using Radio Bubbles to Constrain the Matter Content of AGN Jets (2006)
Dunn, R. J. H., Fabian, A. C., Celotti, A.
We revisit a method to obtain upper limits on the jet matter content combining synchrotron self-absorption constraints and the large scale bubble energy. We use both X-ray observations, which give...
Radiative pressure feedback by a quasar in a galactic bulge (2006)
Fabian, A. C., Celotti, A., Erlund, M. C.
We show that Eddington-limited black hole luminosities can be sufficient to deplete a galaxy bulge of gas through radiation pressure, when the ionization state of the gas and the presence of dust are...
Have we detected the most luminous ULX so far? (2006)
Miniutti, G., Ponti, G., Dadina, M., Cappi, M., Malaguti, G., Fabian, A. C., ...
We report the XMM-Newton detection of a moderately bright X-ray source superimposed on the outer arms of the inactive spiral galaxy MCG-03-34-63 (z=0.0213). It is clearly offset from the nucleus (by...
An extended multi-zone model for the MCG-6-30-15 warm absorber (2006)
R. Morales, A. C. Fabian, C. S. Reynolds
An extended multi-zone model for the MCG-6-30-15 warm absorber
Enrichment in the Centaurus cluster of galaxies (2006)
We perform a detailed spatially-resolved, spectroscopic, analysis of the core of the Centaurus cluster of galaxies using a deep Chandra X-ray observation and XMM-Newton data. The Centaurus cluster...
On the X-ray spectra of luminous, inhomogeneous accretion flows (2006)
Merloni, A., Malzac, J., Fabian, A. C., Ross, R. R.
We discuss the expected X-ray spectral and variability properties of black hole accretion discs at high luminosity, under the hypothesis that radiation pressure dominated discs are subject to violent...
Extended inverse-Compton emission from distant, powerful radio galaxies (2006)
Erlund, M. C., Fabian, A. C., Blundell, Katherine M., Celotti, A., Crawford, C. S.
We present Chandra observations of two relatively high redshift FRII radio galaxies, 3C 432 and 3C 191 (z=1.785 and z=1.956 respectively), both of which show extended X-ray emission along the axis of...
Fe emission and ionized excess absorption in the luminous quasar 3C109 with XMM-Newton (2006)
Miniutti, G., Ballantyne, D. R., Allen, S. W., Fabian, A. C., Ross, R. R.
We report results from an XMM-Newton observation of the broad-line radio galaxy 3C109 (z=0.3056). Confirming previous results, an Fe emission line is detected, possibly comprising a broad component....
The magnetic nature of disk accretion onto black holes (2006)
Miller, J. M., Raymond, J., Fabian, A. C., Steeghs, D., Homan, J., Reynolds, C. S., ...
Although disk accretion onto compact objects - white dwarfs, neutron stars, and black holes - is central to much of high energy astrophysics, the mechanisms which enable this process have remained...
Isothermal shocks in Abell 2199 and 2A 0335+096? (2006)
We report on a partially circular X-ray surface brightness discontinuity found at about 55 kpc from the centre of Abell 2199 with Chandra X-ray observatory observations. Unlike cold fronts found in...
Resonance scattering, absorption and off-centre abundance peaks in clusters of galaxies (2006)
A possible explanation for the central abundance dips found from spatially-resolved X-ray spectroscopy of several groups and clusters of galaxies is resonance scattering. A number of the prominent...
4C 39.29 - extended emission around a powerful Type 2 quasar (2006)
Gandhi, P., Fabian, A. C., Crawford, C. S.
We present new X-ray and optical spectroscopy of a Type 2 quasar candidate selected from a follow-up program of hard, optically-dim, serendipitous Chandra sources. The source is confirmed to be a...
Effects of sedimented helium on the X-ray properties of galaxy clusters (2006)
In this Letter, we consider the role played by the sedimentation of helium nuclei on the emissivity and metallicity distribution of the X-ray emitting plasma in the cores of relaxed galaxy clusters....
Magnetic Fields in the Center of the Perseus Cluster (2006)
Taylor, G. B., Gugliucci, N. E., Fabian, A. C., Sanders, J. S., Gentile, G., Allen, S. W.
We present Very Long Baseline Array (VLBA) observations of the nucleus of NGC 1275, the central, dominant galaxy in the Perseus cluster of galaxies. These are the first observations to resolve the...
A Long, Hard Look at the Low-Hard State in Accreting Black Holes (2006)
Miller, J. M., Homan, J., Steeghs, D., Rupen, M., Hunstead, R. W., Wijnands, R., ...
We present the first results of coordinated multi-wavelength observations of the Galactic black hole GX 339-4 in a canonical low-hard state, obtained during its 2004 outburst. XMM-Newton observed the...
Worsley, M. A., Fabian, A. C., Bauer, F. E., Alexander, D. M., Brandt, W. N., Lehmer, B. D.
The emission from individual X-ray sources in the Chandra Deep Fields and XMM-Newton Lockman Hole shows that almost half of the hard X-ray background above 6 keV is unresolved and implies the...
The relation between accretion rate and jet power in X-ray luminous elliptical galaxies (2006)
Allen, S. W., Dunn, R. J. H., Fabian, A. C., Taylor, G. B., Reynolds, C. S.
Using Chandra X-ray observations of 9 nearby, X-ray luminous ellipticals with good optical velocity dispersion measurements, we show that a tight correlation exists between the Bondi accretion rates...
Tracing gas motions in the Centaurus Cluster (2006)
Graham, J., Fabian, A. C., Sanders, J. S., Morris, R. G.
We apply the stochastic model of iron transport developed by Rebusco et. al. (2005) to the Centaurus cluster. Using this model, we find that an effective diffusion coefficient D in the range 2x10^28...
Galaxy cluster mass profiles (2006)
Accurate measurements of the mass distribution in galaxy and cluster halos are essential to test the cold dark matter (CDM) paradigm. The cosmological model predicts a universal shape for the density...
Worsley, M. A., Fabian, A. C., Pooley, G. G., Chandler, C. J.
We report on the extreme behaviour of the high redshift blazar GB B1428+4217 at z=4.72. A continued programme of radio measurements has revealed an exceptional flare in the lightcurve, with the 15.2...
OVI Observations of Galaxy Clusters: Evidence for Modest Cooling Flows (2006)
Bregman, Joel N., Fabian, A. C., Miller, Eric D., Irwin, Jimmy A.
A prediction of the galaxy cluster cooling flow model is that as gas cools from the ambient cluster temperature, emission lines are produced in gas at subsequently decreasing temperatures. Gas...
Yuan, W., Fabian, A. C., Worsley, M. A., McMahon, R. G.
(abridged) We firstly present the results of X-ray spectroscopic observations with XMM-Newton for four high-redshift radio-loud quasars at z>4. These observations more than double the number of z>4...
XMM-Newton study of the complex and variable spectrum of NGC 4051 (2006)
Ponti, G., Miniutti, G., Cappi, M., Maraschi, L., Fabian, A. C., Iwasawa, K.
We study the X-ray spectral variability of the Narrow Line Seyfert 1 galaxy NGC 4051 as observed during two XMM-Newton observations. The data show evidence for a neutral and constant reflection...
The Ultra Luminous X-ray sources in the High Velocity System of NGC 1275 (2006)
Gonzalez-Martin, O., Fabian, A. C., Sanders, J. S.
We report the results of a study of X-ray point sources coincident with the High Velocity System (HVS) projected in front of NGC 1275. A very deep X-ray image of the core of the Perseus cluster made...
The new XEUS science case (2006)
Hasinger, G., Arnaud, M., Barcons, X., Barret, D., Bleeker, J., Böhringer, H., ...
The new XEUS science case (2006)
Hasinger, G., Arnaud, M., Barcons, X., Barret, D., Bleeker, J.A., Böhringer, H., ...
XEUS is the potential successor to ESA's XMM-Newton X-ray observatory and is being proposed in response to the Cosmic Vision 2015-2025 long term plan for ESA's Science Programme. A new mission...
Miller, J.M., Raymond, J., Homan, J., Fabian, A.C., Steeghs, D., Wijnands, R.A.D., ...
We observed the bright phase of the 2003 outburst of the Galactic black hole candidate H1743-322 in X-rays simultaneously with Chandra and RXTE on four occasions. The Chandra HETGS spectra reveal...
The magnetic nature of disk accretion onto black holes (2006)
Miller, J.M., Raymond, J., Fabian, A.C., Steeghs, D., Homan, J., Reynolds, C., ...
Although disk accretion onto compact objects-white dwarfs, neutron stars and black holes-is central to much of high-energy astrophysics, the mechanisms that enable this process have remained...
Evidence for a Magnetically Driven Disk Wind in the Black Hole GRO J1655-40 (2006)
Miller, J.M., Raymond, J., Fabian, A.C., Reynolds, C., Steeghs, D., Homan, J., ...
We recently observed the Galactic black hole GRO J1655-40 in outburst on two occasions, using Chandra and RXTE. The Chandra/HETG spectra reveal over 90 absorption lines. The lines are blue-shifted,...
A Long, Hard Look at the Low/Hard State in Accreting Black Holes (2006)
Miller, J.M., Homan, J., Steeghs, D., Rupen, M., Hunstead, R.W., Wijnands, R.A.D., ...
We present the first results of coordinated multiwavelength observations of the Galactic black hole GX 339-4 in a canonical low/hard state, obtained during its 2004 outburst. XMM-Newton observed the...
X-ray Spectroscopy of Cooling Clusters (2005)
Peterson, J. R., Fabian, A. C.
We review the X-ray spectra of the cores of clusters of galaxies. Recent high resolution X-ray spectroscopic observations have demonstrated a severe deficit of emission at the lowest X-ray...
On the Robustness of Cool Disc Components in Bright ULXs (2005)
Miller, J. M., Fabian, A. C., Miller, M. C.
In this letter, we comment on the robustness of putative cool (kT ~ 0.2 keV) accretion disc components in the X-ray spectra of the most luminous (L ~ 10^40 erg/s) ultra-luminous X-ray sources (ULXs)...
On the origin and excitation of the extended nebula surrounding NGC 1275 (2005)
Hatch, N. A., Crawford, C. S., Fabian, A. C., Johnstone, R. M.
We use line-of-sight velocity information on the filamentary emission-line nebula of NGC 1275 to infer a dynamical model of the nebula's flow through the surrounding intracluster gas. We detect...
Precession of the Super-Massive Black Hole in NGC 1275 (3C 84)? (2005)
Dunn, R. J. H., Fabian, A. C., Sanders, J. S.
The X-ray holes at the centre of the Perseus Cluster of galaxies are not all at the same position angle with respect to the centre of the cluster. This configuration would result if the jet inflating...
X-ray reflections on AGN (2005)
X-ray reflection generates much of the spectral complexity in the X-ray spectra of AGN. It is argued that strong relativistic blurring of the reflection spectrum should commonly be expected from...
We report results from the XMM-Newton observation of the radio-loud quasar PG 1425+267 (z=0.366). The EPIC-pn data above 2 keV exhibit a double-peaked emission feature in the Fe K band. The higher...
A very deep Chandra observation of the Perseus cluster: shocks, ripples and conduction (2005)
Fabian, A. C., Sanders, J. S., Taylor, G. B., Allen, S. W., Crawford, C. S., Johnstone, R. M., ...
We present the first results from a very deep Chandra X-ray observation of the core of the Perseus cluster of galaxies. A pressure map reveals a clear thick band of high pressure around the inner...
The low-power nucleus of PKS 1246-410 in the Centaurus Cluster (2005)
Taylor, G. B., Sanders, J. S., Fabian, A. C., Allen, S. W.
We present Chandra, Very Large Array (VLA), and Very Long Baseline Array (VLBA) observations of the nucleus of NGC 4696, a giant elliptical in the Centaurus cluster of galaxies. Like M87 in the Virgo...
Radio Bubbles in Clusters (2005)
Dunn, R. J. H., Fabian, A. C., Taylor, G. B.
We extend our earlier work on cluster cores with distinct radio bubbles, adding more active bubbles, i.e. those with Ghz radio emission, to our sample, and also investigating ``ghost bubbles,'' i.e....
INTEGRAL observations of AGN in the Galactic Plane (2005)
Soldi, S., Beckmann, V., Bassani, L., Courvoisier, T. J. -L., Landi, R., Malizia, A., ...
We present results on approximately one year of INTEGRAL observations of six AGN detected during the regular scans of the Galactic Plane. The sample is composed by five Seyfert 2 objects (MCG...
A possible line-like emission feature at 8 keV in the Seyfert 1.2 UGC 3973 (2005)
Gallo, L. C., Fabian, A. C., Boller, Th., Pietsch, W.
Two short X-ray exposures (< 3600 s each) of the radio-quiet Seyfert 1.2 galaxy UGC 3973 (Mrk 79) were conducted with XMM-Newton as part of an AGN snap-shot survey. In this paper we concentrate on...
Crawford, C. S., Hatch, N. A., Fabian, A. C., Sanders, J. S.
We present images of NGC4696, the central galaxy in the Centaurus cluster, showing the large extent of cool filaments which are bright in H-alpha line emission. These filaments share the detailed...
XMM-Newton observations of the Lockman Hole IV: spectra of the brightest AGN (2005)
Mateos, S., Barcons, X., Carrera, F. J., Ceballos, M. T., Hasinger, G., Lehmann, I., ...
This paper presents the results of a detailed X-ray spectral analysis of a sample of 123 X-ray sources (46 being type-1 AGN and 28 type-2 AGN) detected with XMM-Newton in the Lockman Hole field....
X-rays from the Type II quasar in the hyperluminous infrared galaxy IRAS F15307+3252 (2005)
Iwasawa, K., Crawford, C. S., Fabian, A. C., Wilman, R. J.
We report the detection of X-ray emission from the hyperluminous infrared galaxy IRAS F15307+3252 at z=0.93 and its properties obtained from XMM-Newton observations. Although the X-ray emission is...
Investigating ionized disc models of the variable narrow-line Seyfert 1 PG 1404+226 (2005)
Crummy, J., Fabian, A. C., Brandt, W. N., Boller, Th.
We investigate the use of relativistically blurred photoionized disc models on an XMM-Newton observation of the Narrow Line Seyfert 1 galaxy PG 1404+226. The model is designed to reproduce the...
Young, A. J., Lee, J. C., Fabian, A. C., Reynolds, C. S., Gibson, R. R., Canizares, C. R.
We present a high resolution X-ray spectrum of the iron K bandpass in MCG-6-30-15 based on a 522 ksec observation with Chandra's High Energy Transmission Grating Spectrometer. The Chandra spectrum is...
The giant H-alpha/X-ray filament in the cluster of galaxies A1795 (2005)
Crawford, C. S., Sanders, J. S., Fabian, A. C.
The cluster of galaxies A1795 hosts a 46 kpc-long filament at its core, which is clearly visible in the light of H-alpha and X-ray emission. We present optical slit spectroscopy and deeper Chandra...
Fabian, A. C., Miniutti, G., Iwasawa, K., Ross, R. R.
We report results obtained from six XMM-Newton observations of the Seyfert galaxy 1H 0419-577. Here we show that the X-ray spectrum and variability are well described by a two-component model...
Sanders, J. S., Fabian, A. C., Dunn, R. J. H.
Using a deep Chandra observation of the Perseus cluster of galaxies, we find a high-abundance shell 250 arcsec (93 kpc) from the central nucleus. This ridge lies at the edge of the Perseus radio...
The Prevalence of Cooling Cores in Clusters of Galaxies at z~0.15-0.4 (2005)
Bauer, F. E., Fabian, A. C., Sanders, J. S., Allen, S. W., Johnstone, R. M.
We present a Chandra study of 38 X-ray luminous clusters of galaxies in the ROSAT Brightest Cluster Sample (BCS) that lie at z~0.15-0.4. We find that the majority of clusters at moderate redshift...
A deep Chandra observation of the Centaurus cluster: bubbles, filaments and edges (2005)
Fabian, A. C., Sanders, J. S., Taylor, G. B, Allen, S. W.
X-ray images and gas temperatures taken from a deep ~200 ks Chandra observation of the Centaurus cluster are presented. Multiple inner bubbles and outer semicircular edges are revealed, together with...
Evidence for an Untruncated Accretion Disk in the Broad-Line Radio Galaxy 4C+74.26 (2005)
Ballantyne, D. R., Fabian, A. C.
We present evidence for a broad, ionized Fe K line in the XMM-Newton spectrum of the broad-line radio galaxy (BLRG) 4C+74.26. This is the first indication that the innermost regions of the accretion...
An XMM-Newton Observation of Abell 2597 (2005)
Morris, R. Glenn, Fabian, A. C.
We report on a 120 ks XMM-Newton observation of the galaxy cluster Abell 2597. Results from both the European Photon Imaging Camera (EPIC) and the Reflection Grating Spectrometer (RGS) are presented....
On viscosity, conduction and sound waves in the intracluster medium (2005)
Fabian, A. C., Reynolds, C. S., Taylor, G. B., Dunn, R. J. H.
Recent X-ray and optical observations of the Perseus cluster indicate that the viscous and conductive dissipation of sound waves is the mechanism responsible for heating the intracluster medium and...
A comprehensive range of X-ray ionized reflection models (2005)
X-ray ionized reflection occurs when a surface is irradiated with X-rays so intense that its ionization state is determined by the ionization parameter xi propto F/n, where F is the incident flux and...
INTEGRAL SPI limits on electron-positron annihilation radiation from the galactic plane (2005)
Teegarden, B. J., Watanabe, K., Jean, P., Knödlseder, J., Lonjou, V., Roques, J. P., ...
Probing the X-ray universe: analysis of faint sources with XMM-Newton (2005)
Streblyanska, A., Hasinger, G., Barcons, X., Bergeron, J., Brunner, H., Fabian, A. C., ...
XMM-Newton observations of the Lockman Hole IV: spectra of the brightest AGN (2005)
Mateos, S., Barcons, X., Carrera, F. J., Ceballos, M. T., Hasinger, G., Lehmann, I., ...
Resolving the X-ray background (2005)
Worsley, M. A., Fabian, A. C., Alexander, D. M., Bauer, F. E., Brandt, W. N., Hasinger, G., ...
XMM-Newton observations of the Lockman Hole IV: spectra of the brightest AGN (2005)
Mateos, S., Barcons, X., Carrera, F.J., Ceballos, M.T., Hasinger, G., Lehmann, I., ...
Revealing the Focused Companion Wind in Cygnus X-1 with Chandra (2005)
Miller, J.M., Wojdowski, P., Schulz, N.S., Marshall, H.L., Fabian, A.C., Remillard, R.A., ...
We have analyzed a Chandra HETGS spectrum of the Galactic black hole Cygnus X-1, obtained at a source flux that is approximately twice that commonly observed in its persistent low-intensity,...
Rapid X-ray Variability of Seyfert 1 Galaxies (2004)
Vaughan, S., Fabian, A. C., Iwasawa, K.
The rapid and seemingly random fluctuations in X-ray luminosity of Seyfert galaxies provided early support for the standard model in which Seyferts are powered by a supermassive black hole fed from...
Worsley, M. A., Fabian, A. C., Bauer, F. E., Alexander, D. M., Hasinger, G., Mateos, S., ...
We extend our earlier work on X-ray source stacking in the deep XMM-Newton observation of the Lockman Hole, to the 2 Ms Chandra Deep Field North and the 1 Ms Chandra Deep Field South. The XMM-Newton...
Broad Iron Lines in AGN and X-ray Binaries (2004)
Several AGN and black hole X-ray binaries show a clear very broad iron line which is strong evidence that the black holes are rapidly spinning. Detailed analysis of these objects shows that the...
Detections of Molecular Hydrogen in the Outer Filaments of NGC 1275 (2004)
Hatch, N. A., Crawford, C. S., Fabian, A. C., Johnstone, R. M.
We present clear spectroscopic detections of molecular hydrogen in the outer filaments of the H-alpha nebula surrounding the central galaxy of the Perseus cluster, NGC 1275. This implies the presence...
Streblyanska, A., Hasinger, G., Finoguenov, A., Barcons, X., Mateos, S., Fabian, A. C.
Using the 770 ksec XMM-Newton survey of the Lockman Hole field in combination with extensive optical identifications of the AGN population, we derive an average rest-frame spectrum of AGN types-1 and...
The Obscured X-ray Background and Evolution of AGN (2004)
The X-ray Background has been resolved in the 0.5-5keV band and found to consist mostly of both unabsorbed and absorbed AGN with column densities 1e24). Stacking analysis of the integrated emission...
INTEGRAL/SPI Limits on Electron-Positron Annihilation Radiation from the Galactic Plane (2004)
Teegarden, B. J., Watanabe, K., Jean, P., Knodlseder, J., Lonjou, V., Roques, J. P., ...
The center of our Galaxy is a known strong source of electron-positron 511-keV annihilation radiation. Thus far, however, there have been no reliable detections of annihilation radiation outside of...
Yuan, W., Fabian, A. C., Celotti, A., McMahon, R. G., Matsuoka, M.
We present results from a new XMM-Newton observation of the high-redshift quasar RXJ1028.6-0844 at a redshift of 4.276. The soft X-ray spectral flattening, as reported by a study with ASCA previously...
The exceptional X-ray variability of the dwarf Seyfert nucleus NGC 4395 (2004)
Vaughan, S., Iwasawa, K., Fabian, A. C., Hayashida, K.
An analysis of the X-ray variability of the low luminosity Seyfert nucleus NGC 4395, based on a long XMM-Newton observation, is presented. The power spectrum shows a clear break from a flat spectrum...
The Galaxy Cluster Abell 3581 as seen by Chandra (2004)
Johnstone, R. M., Fabian, A. C., Morris, R. G., Taylor, G. B.
We present results from an analysis of a Chandra observation of the cluster of galaxies Abell 3581. We discover the presence of a point-source in the central dominant galaxy which is coincident with...
Guainazzi, M., Fabian, A. C., Iwasawa, K., Matt, G., Fiore, F.
We present Chandra and XMM-Newton observations of a small sample (11 objects) of optically-selected Seyfert~2 galaxies, for which ASCA and BeppoSAX had suggested Compton-thick obscuration of the...
Iwasawa, K., Miniutti, G., Fabian, A. C.
We report the tentative detection of the modulation of a transient, redshifted Fe Kalpha emission feature in the X-ray spectrum of the Seyfert galaxy NGC3516. The detection of the spectral feature at...
Particle Energies and Filling Fractions of Radio Bubbles in Cluster Cores (2004)
Using Chandra images of cluster cores with clear radio bubbles, we have determined k, which is the ratio of the total particle energy to that of the electrons radiating between 10 MHz and 10 GHz....
The narrow-line quasar NAB 0205+024 observed with XMM-Newton (2004)
Gallo, L. C., Boller, Th., Brandt, W. N., Fabian, A. C., Vaughan, S.
The XMM-Newton observation of the narrow-line quasar NAB 0205+024 reveals three striking differences since it was last observed in the X-rays with ASCA. Firstly, the 2-10 keV power-law is notably...
Unveiling the nature of the highly obscured AGN in NGC5643 with XMM-Newton (2004)
Guainazzi, M., Rodriguez-Pascual, P., Fabian, A. C., Iwasawa, K., Matt, G.
We present results from an XMM-Newton observation of the nearby Seyfert 2 galaxy NGC5643. The nucleus exhibits a very flat X-ray continuum above 2 keV, together with a prominent K-alpha fluorescent...
On the observed disc temperature of accreting intermediate mass black holes (2004)
Fabian, A. C., Ross, R. R., Miller, J. M.
Some ultraluminous X-ray sources in nearby galaxies show soft components resembling thermal disc emission. Calculations based on blackbody emission then indicate that the accreting black holes at the...
Active Galaxies and Cluster Gas (2004)
Two lines of evidence indicate that active galaxies, principally radio galaxies, have heated the diffuse hot gas in clusters. The first is the general need for additional heating to explain the...
The XMM-Newton View of the Broad-Line Radio Galaxy 3C 120 (2004)
Ballantyne, D. R., Fabian, A. C., Iwasawa, K.
We present the results of a 127 ks XMM-Newton observation of the broad-line radio galaxy 3C 120 performed simultaneously with RXTE. The time-averaged spectrum is Seyfert-like, with a reflection...
A Comparison of Intermediate Mass Black Hole Candidate ULXs and Stellar-Mass Black Holes (2004)
Miller, J. M., Fabian, A. C., Miller, M. C.
Cool thermal emission components have recently been revealed in the X-ray spectra of a small number of ultra-luminous X-ray (ULX) sources with L_X > 1 E+40 erg/s in nearby galaxies. These components...
Miller, J. M., Raymond, J., Homan, J., Fabian, A. C., Steeghs, D., Wijnands, R., ...
We observed the bright phase of the 2003 outburst of the Galactic black hole candidate H 1743-322 in X-rays simultaneously with Chandra and RXTE on four occasions. The Chandra/HETGS spectra reveal...
A Chandra observation of the disturbed cluster core of Abell 2204 (2004)
Sanders, J. S., Fabian, A. C., Taylor, G. B.
We present results from an observation of the luminous cluster of galaxies Abell 2204 using the Chandra X-ray Observatory. We show the core of the cluster has a complex morphological structure, made...
Extended X-ray emission at high redshifts: radio galaxies versus clusters (2004)
Most old distant radio galaxies should be extended X-ray sources due to inverse Compton scattering of Cosmic Microwave Background (CMB) photons. Such sources can be an important component in X-ray...
The soft X-ray absorption lines of the Seyfert 1 galaxy MCG--6-30-15 (2004)
Turner, A. K., Fabian, A. C., Lee, J. C., Vaughan, S.
The absorption lines in the soft X-ray spectrum of MCG--6-30-15 are studied using the Reflection Grating Spectrometer data from the 2001 XMM-Newton 320 ks observation. A line search of the full...
An improved approach to measuring H_0 using X-ray and SZ observations of galaxy clusters (2004)
Schmidt, R. W., Allen, S. W., Fabian, A. C.
We present an improved method for predicting the Sunyaev-Zeldovich (SZ) effect in galaxy clusters from spatially-resolved, spectroscopic X-ray data. Using the deprojected electron density and...
Constraints on dark energy from Chandra observations of the largest relaxed galaxy clusters (2004)
Allen, S. W., Schmidt, R. W., Ebeling, H., Fabian, A. C., Van Speybroeck, L.
We present constraints on the mean dark energy density, Omega_X and dark energy equation of state parameter, w_X, based on Chandra measurements of the X-ray gas mass fraction in 26 X-ray luminous,...
Long-term spectral changes in the partial-covering candidate NLS1 1H 0707-495 (2004)
Gallo, L. C., Tanaka, Y., Boller, Th., Fabian, A. C., Vaughan, S., Brandt, W. N.
We compare two XMM-Newton observations of the Narrow-Line Seyfert 1 galaxy 1H 0707-495 separated by two years, and discuss the results in terms of the partial-covering phenomenon. The second longer...
X-ray reflection in the NLS1 1H 0707-495 (2004)
Fabian, A. C., Miniutti, G., Gallo, L., Boller, Th., Tanaka, Y., Vaughan, S., ...
We apply a reflection-dominated model to the second XMM-Newton observation of the Narrow Line Seyfert 1 galaxy 1H 0707-495. As in the first XMM-Newton observation a sharp spectral drop is detected...
Gallo, L. C., Boller, Th., Brandt, W. N., Fabian, A. C., Grupe, D.
The narrow-line quasar PHL 1092 was observed by XMM-Newton at two epochs separated by nearly thirty months. Timing analyses confirm the extreme variability observed during previous X-ray missions. A...
The (un)resolved X-ray background in the Lockman Hole (2004)
Worsley, M. A., Fabian, A. C., Barcons, X., Mateos, S., Hasinger, G., Brunner, H.
Most of the soft and a growing fraction of the harder X-ray background has been resolved into emission from point sources, yet the resolved fraction above 7 keV has only been poorly constrained. We...
Transmission- to reflection-dominated transition in Seyfert 2 galaxies: the XMM-Newton view (2004)
Guainazzi, M., Rodriguez-Pascual, P., Fabian, A. C., Iwasawa, K., Matt, G., Fiore, F.
In this paper we present the current status of a XMM-Newton program to observe an optically-defined, complete and unbiased sample of Compton-thick Seyfert 2 galaxies. The main goal of this project is...
XMM-Newton observations of GB B1428+4217: confirmation of intrinsic soft X-ray absorption (2004)
Worsley, M. A., Fabian, A. C., Celotti, A., Iwasawa, K.
We report the results of XMM-Newton observations of the X-ray bright, radio-loud blazar GB B1428+4217 at a redshift of z=4.72. We confirm the presence of soft X-ray spectral flattening at energies
An XMM-Newton observation of Ark 120: the X-ray spectrum of a `bare' Seyfert 1 nucleus (2004)
Vaughan, S., Fabian, A. C., Ballantyne, D. R., De Rosa, A., Piro, L., Matt, G.
We report on a long (100 ks) XMM-Newton observation of the bright Seyfert 1 galaxy Arakelian 120. The source previously showed no signs of intrinsic reddening in its infrared-ultraviolet continuum...
Relativistic Iron Lines in Galactic Black Holes: Recent Results and Lines in the ASCA Archive (2004)
Miller, J. M., Fabian, A. C., Nowak, M. A., Lewin, W. H. G.
Recent observations with Chandra and XMM-Newton, aided by broad-band spectral coverage from RXTE, have revealed skewed relativistic iron emission lines in stellar-mass Galactic black hole systems....
Variability in the X-ray warm absorber in GX 339-4 (2004)
Miller, J.M., Raymond, J., Fabian, A.C., Wijnands, R., Klis, M. Van Der, Lewin, W.H.G.
I Zw 1 observed with XMM-Newton (2004)
Gallo, L. C., Boller, Th., Brandt, W. N., Fabian, A. C., Vaughan, S.
The (un)resolved X-ray background in the Lockman Hole (2004)
Worsley, M. A., Fabian, A. C., Barcons, X., Mateos, S., Hasinger, G., Brunner, H.
X-ray reflection in the narrow-line Seyfert 1 galaxy 1H 0707-495 (2004)
Fabian, A. C., Miniutti, G., Gallo, L., Boller, Th., Tanaka, Y., Vaughan, S., ...
The narrow-line quasar NAB 0205+024 observed with XMM-Newton (2004)
Gallo, L. C., Boller, T., Brandt, W. N., Fabian, A. C., Vaughan, S.
Arakelian 564: an XMM-Newton view (2004)
Vignali, Cristian, Brandt, W. N., Boller, Th., Fabian, A. C., Vaughan, Simon
Variability in the X-ray Warm Absorber in GX 339-4 (2004)
Miller, J.M., Raymond, J., Fabian, A.C., Wijnands, R.A.D., Klis, M. Van Der, Lewin, W.H.G.
We have previously reported evidence for a Seyfert-like warm absorber in the stellar-mass Galactic black hole GX 339-4, based on a Chandra/HETGS spectrum obtained during a 75 ksec observation during...
Miller, J.M., Raymond, J., Fabian, A.C., Homan, J., Nowak, M.A., Wijnands, R.A.D., ...
We observed the Galactic black hole GX 339-4 with the Chandra High Energy Transmission Grating Spectrometer (HETGS) for 75 ks during the decline of its 2002-2003 outburst. The sensitivity of this...
Miller, J.M., Fabian, A.C., Reynolds, C.S., Nowak, M.A., Homan, J., Freyberg, M.J., ...
We have analyzed spectra of the Galactic black hole GX 339-4 obtained through simultaneous 76 ks XMM-Newton/EPIC-pn and 10 ks Rossi X-Ray Timing Explorer observations during a bright phase of its...
Gallo, L. C., Boller, Th., Brandt, W. N., Fabian, A. C., Vaughan, S.
We present a 20 ks XMM-Newton observation of the prototypical Narrow-Line Seyfert 1 galaxy IZw1. The best-fit model to the data is a double blackbody plus a dominant power-law, on which complex soft...
Miller, J. M., Fabian, A. C., Reynolds, C. S., Nowak, M. A., Homan, J., Freyberg, M. J., ...
We have analyzed spectra of the Galactic black hole GX 339-4 obtained through simultaneous 76 ksec XMM-Newton/EPIC-pn and 10 ksec RXTE observations during a bright phase of its 2002-2003 outburst. An...
Mapping small-scale temperature and abundance structures in the core of the Perseus cluster (2003)
Sanders, J. S., Fabian, A. C., Allen, S. W., Schmidt, R. W.
We report further results from a 191 ks Chandra observation of the core of the Perseus cluster, Abell 426. The emission-weighted temperature and abundance structure is mapped detail. There are...
A long, hard look at MCG-6-30-15 with XMM-Newton II: detailed EPIC analysis and modelling (2003)
The bright Seyfert 1 galaxy MCG-6-30-15 has provided some of the best evidence to date for the existence of supermassive black holes in active galactic nuclei. Observations with ASCA revealed an...
Bromley, J. M., Somerville, R. S., Fabian, A. C.
We investigate the constraints on models of supermassive black hole (SMBH) and quasar formation obtainable from two recent observational developments: the discovery of luminous quasars at z~6, and...
Miniutti, G., Fabian, A. C., Miller, J. M.
We report spectral results from three BeppoSAX observations of the black hole candidate XTE J1650-500 during its 2001/2002 outburst. We find strong evidence for the presence of a broad and strongly...
An X-ray absorption analysis of the high-velocity system in NGC 1275 (2003)
Gillmon, K., Sanders, J. S., Fabian, A. C.
We present an X-ray absorption analysis of the high-velocity system (HVS) in NGC 1275 using results from a deep 200 ks Chandra observation. We are able to describe the morphology of the HVS in more...
Powerful obscured AGN among X-ray hard, optically-dim serendipitous Chandra sources (2003)
Gandhi, P., Crawford, C. S., Fabian, A. C., Johnstone, R. M.
We present a small sample of Chandra X-ray sources selected from the fields of ACIS observations which probe fluxes around the break in the hard band source counts. The targets of these fields...
Miller, J. M., Fabian, A. C., Miller, M. C.
We report the results of an analysis of two XMM-Newton/EPIC-pn spectra of the bright ultraluminous X-ray source M81 X-9 (Holmberg IX X-1), obtained in snapshot observations. Soft thermal emission is...
XMM-Newton confirmation of a warm absorber in the z=4.4 blazar PMN J0525-3343 (2003)
Worsley, M. A., Fabian, A. C., Turner, A. K., Celotti, A., Iwasawa, K.
We present the analysis and results from a series of XMM-Newton observations of the distant blazar PMN J0525-3343, at a redshift of 4.4. The X-ray spectrum shows a spectral flattening below ~1 keV...
Arakelian 564: An XMM-Newton view (2003)
Vignali, C., Brandt, W. N., Boller, Th., Fabian, A. C., Vaughan, S.
We report on two XMM-Newton observations of the bright narrow-line Seyfert 1 galaxy Ark 564 taken one year apart (2000 June and 2001 June). The 0.6-10 keV continuum is well described by a soft...
Iwasawa, K., Lee, J. C., Young, A. J., Reynolds, C. S., Fabian, A. C.
We report our analysis of X-ray spectra of the Seyfert galaxy IRAS 18325-5926 (=Fairall 49) obtained from various X-ray observatories prior to XMM-Newton, including new results from two RXTE and one...
Extended X-ray emission in the high redshift quasar GB 1508+5714 at z=4.3 (2003)
Yuan, W., Fabian, A. C., Celotti, A., Jonker, P. G.
We report the discovery of extended X-ray emission around the powerful high-redshift quasar GB 1508+5714 at z=4.3, revealed in a long Chandra ACIS observation. The emission feature is 3-4 arcsec away...
Gallo, L. C., Boller, Th., Tanaka, Y., Fabian, A. C., Brandt, W. N., Welsh, W. F., ...
We report on the XMM-Newton timing properties of the most X-ray variable, radio-quiet, NLS1 IRAS 13224-3809. IRAS 13224-3809 continues to display the extremely variable behavior that was previously...
A light bending model for the X-ray temporal and spectral properties of accreting black holes (2003)
Uncorrelated variability between direct X-ray continuum and reflection components (including the Fe line, if present) has been reported in many accreting black hole systems, challenging theoretical...
A long hard look at MCG-6-30-15 with XMM-Newton and BeppoSAX (2003)
Vaughan, S., Fabian, A. C., Iwasawa, K., Turner, A. K.
We summarise the primary results from a 320 ks observation of the bright Seyfert 1 galaxy MCG-6-30-15 with XMM-Newton and Beppo-SAX.
Thermal conduction and reduced cooling flows in galaxy clusters (2003)
Conduction may play an important role in reducing cooling flows in galaxy clusters. We analyse a sample of sixteen objects using Chandra data and find that a balance between conduction and cooling...
Miller, J. M., Raymond, J., Fabian, A. C., Homan, J., Nowak, M. A., Wijnands, R., ...
We observed the Galactic black hole GX 339-4 with the Chandra High Energy Transmission Grating Spectrometer (HETGS) for 75 ksec during the decline of its 2002-2003 outburst. The sensitivity of this...
The lack of variability of the iron line in MCG-6-30-15: general relativistic effects (2003)
Miniutti, G., Fabian, A. C., Goyder, R., Lasenby, A. N.
The spectrum and variability of the Seyfert galaxy MCG-6-30-15 can be decomposed into two apparently disconnected components: a highly variable power law and an almost constant component which...
The X-ray nebula around the Seyfert 2 galaxy NGC4388 (2003)
Iwasawa, K., Wilson, A. S., Fabian, A. C., Young, A. J.
We report on X-ray emission from the Seyfert 2 galaxy NGC4388 observed with the Chandra X-ray Observatory. A hard X-ray peak is found at the position of the active nucleus suggested by optical and...
A deep Chandra observation of the Perseus cluster: shocks and ripples (2003)
Fabian, A. C., Sanders, J. S., Allen, S. W., Crawford, C. S., Iwasawa, K., Johnstone, R. M., ...
We present preliminary results from a deep observation lasting almost 200 ks, of the centre of the Perseus cluster of galaxies around NGC 1275. The X-ray surface brightness of the intracluster gas...
Fabian, A. C., Sanders, J. S., Crawford, C. S., Conselice, C. J., Gallagher III, J. S., Wyse, R. F. G.
NGC 1275 in the centre of the Perseus cluster of galaxies, Abell 426, is surrounded by a spectacular filamentary Halpha nebula. Deep Chandra X-ray imaging has revealed that the brighter outer...
A BeppoSAX observation of MKN6 (2003)
Malizia, A., Bassani, L., Capalbi, M., Fabian, A. C., Fiore, F., Nicastro, F.
We have used the BeppoSAX satellite to study the broad band (0.5-100 keV) X-ray spectrum of the Seyfert 1.5 galaxy MKN6. The source is characterized by a power law of Gamma=1.7 [+0.08, -0.07] and...
Ballantyne, D. R., Fabian, A. C.
The iron K line is perhaps the most important spectral diagnostic available in the study of accreting black holes. The line is thought to result from the reprocessing of external X-rays by the...
Obscured Active Galactic Nuclei and Obscured Accretion (2003)
Most of the local active galactic nucleus (AGN) population is obscured and much of the X-ray background originates in obscured AGNs. The contribution of obscured accretion to the growth of massive...
X-rays from Clusters of Galaxies (2003)
The X-ray emission from clusters of galaxies enables them to be used as good cosmological probes and as an example for massive galaxy formation. The gas mass fraction in clusters should be a...
A softer look at MCG--6-30-15 with XMM-Newton (2003)
Turner, A. K., Fabian, A. C., Vaughan, S., Lee, J. C.
We present analysis and results from the Reflection Grating Spectrometer during the 320 ks XMM observation of the Seyfert 1 galaxy MCG-6-30-15. The spectrum is marked by a sharp drop in flux at 0.7...
Iron K alpha line profiles and the inner boundary condition of accretion flows (2003)
Recent X-ray observations have shown evidence for exceptionally broad and skewed iron K alpha emission lines from several accreting black hole systems. The lines are assumed to be due to fluorescence...
Chandra and XMM-Newton observations of Tololo 0109-383 (2003)
Matt, G., Bianchi, S., Guainazzi, M., Brandt, W. N., Fabian, A. C., Iwasawa, K., ...
We present and discuss Chandra and XMM-Newton observations of the Seyfert 2 galaxy and Compton-thick absorbed source, Tololo~0109-383. The hard X-ray emission (i.e. above $\sim$2 keV), is dominated...
A two-component ionized reflection model of MCG--6-30-15 (2003)
Ballantyne, D. R., Vaughan, S., Fabian, A. C.
Ionized reflection has often been considered as the explanation for the unusual Fe K variability observed in MCG--6-30-15. In this paper, we test this model using a 325 ks observation of MCG--6-30-15...
Evidence for an intermediate mass black hole and a multi-zone warm absorber in NGC 4395 (2003)
Shih, D. C., Iwasawa, K., Fabian, A. C.
We report on the results of an analysis in the X-ray band of a recent long ASCA observation of NGC 4395, the most variable low-luminosity AGN known. A relativistically-broadened iron line at ~6.4 keV...
The iron line in MCG-6-30-15 from XMM-Newton: evidence for gravitational light-bending? (2003)
The lack of variability of the broad iron line seen in the Seyfert 1 galaxy MCG-6-30-15 is studied using the EPIC pn data obtained from a 2001 observation of 325 ks, during which the count rate from...
A deep Chandra observation of the cluster environment of the z=1.786 radio galaxy 3C294 (2003)
Fabian, A. C., Sanders, J. S., Crawford, C. S., Ettori, S.
We report the results from a 200 ks Chandra observation of the z=1.786 radio galaxy 3C294 and its cluster environment, increasing by tenfold our earlier observation. The diffuse emission, extending...
The high frequency power spectrum of Markarian 766 (2003)
An analysis is presented of the power spectrum of X-ray variability of the bright Seyfert 1 galaxy Mrk 766 as observed by XMM-Newton. Over the 0.2-10 keV energy range the power spectral density (PSD)...
Chandra and RXTE spectroscopy of the Galactic microquasar XTE J1550-564 in outburst (2003)
Miller, J.M., Marshall, H., Wijnands, R.A.D., Matteo, T. Di, Fox, D.W., Kommers, J., ...
XEUS: the x-ray evolving universe spectroscopy mission (2003)
Parmar, A.N., Hasinger, G., Arnaud, M., Barcons, X., Barret, D., Blanchard, A., ...
Accretion onto the supermassive black hole in M87 (2003)
Di Matteo, T., Allen, S. W., Fabian, A. C., Wilson, A. S., Young, A. J.
Chandra X-ray observations of the giant elliptical galaxy M87 resolve the thermal state of the hot interstellar medium into the accretion (Bondi) radius of its central 3 x 10(9) M-circle dot black...
XEUS - the X-ray evolving universe spectroscopy mission (2003)
Parmar, A. N., Hasinger, G., Arnaud, M., Barcons, X., Barret, D., Blanchard, A., ...
Chandra and RXTE spectroscopy of the Galactic microquasar XTE J1550-564 in outburst (2003)
Miller, J. M., Marshall, H. L., Wijands, R., Di Matteo, T., Fox, D. W., Kommers, J., ...
Deep ISOPHOT far-infrared imaging of M86 (2003)
Stickel, Manfred, Bregman, J.N., Fabian, A.C., White, D.A., Elmegreen, D.M.
Ionized Disc Models of MCG-6-30-15 (2002)
Ballantyne, D. R., Fabian, A. C., Vaughan, S.
Ionized reflection is one of the possible mechanisms proposed to explain the small short-timescale variability of the MCG-6-30-15 Fe K line. In this contribution, we show fits of the Ross & Fabian...
X-ray continuum variability of MCG-6-30-15 (2002)
Vaughan, S., Fabian, A. C., Nandra, K.
This paper presents a comprehensive examination of the X-ray continuum variability of the bright Seyfert 1 galaxy MCG-6-30-15. The source clearly shows the strong, linear correlation between rms...
Optical and near-infrared observations of hard serendipitous Chandra sources (2002)
Crawford, C. S., Gandhi, P., Fabian, A. C.
We have been carrying out a successful observational programme targeted at finding the highly obscured quasars that are thought to be the main contributors to the hard X-ray background. Out of 56...
Extended X-ray emission around four 3C quasars at 0.55 (2002)
Crawford, C. S., Fabian, A. C.
We report on the detection of a soft spatially-extended component of X-ray emission around four intermediate-redshift 3C quasars observed with Chandra: 3C254, 3C263, 3C275.1 and 3C281. The bolometric...
Wilman, R. J., Fabian, A. C., Crawford, C. S., Cutri, R. M.
We present XMM-Newton observations of two hyperluminous IRAS galaxies (L_Bol>1E13 L_sun), neither of which was previously detected by ROSAT. Published models of the infrared SEDs imply that a...
Miller, J. M., Fabbiano, G., Miller, M. C., Fabian, A. C.
We have analyzed an XMM-Newton observation of the nearby spiral galaxy NGC 1313, which contains two "ultra-luminous" X-ray (ULX) sources. We measure isotropic luminosities of L_X = 2.0 * 10^(40)...
X-ray background synthesis: the infrared connection (2002)
We present a synthesis model of the X-ray background based on the cross-correlation between mid-infrared and X-ray surveys, where the distribution of type 2 sources is assumed to follow that of...
A survey of molecular hydrogen in the central galaxies of cooling flows. (2002)
Edge, A. C., Wilman, R. J., Johnstone, R. M., Crawford, C. S., Fabian, A. C., Allen, S. W.
We present a large sample of H- and K-band spectra of 32 optically line-luminous central cluster galaxies. We find significant rovibrational H2 emission in 23 of these galaxies as well as H...
Cluster cores and cooling flows (2002)
The gas temperature in the cores of many clusters of galaxies drops inward by about a factor of three or more within the central 100 kpc radius. The radiative cooling time drops over the same region...
Sun, M., Jones, C., Murray, S. S., Allen, S. W., Fabian, A. C., Edge, A. C.
We present the results from a 42 ks \chandra ACIS observation of the galaxy cluster A478. This cluster is generally considered to be highly relaxed. The \chandra image reveals, for the first time,...
Flux and spectral variations in the Circinus Galaxy (2002)
Bianchi, S., Matt, G., Fiore, F., Fabian, A. C., Iwasawa, K., Nicastro, F.
We report on a dramatic flux (50 % increase in the LECS and MECS band) and spectral variation between two BeppoSAX observations of the Circinus Galaxy performed almost three years apart. Through the...
Some effects of small-scale metallicity variations in cooling flows (2002)
Morris, R. Glenn, Fabian, A. C.
In an attempt to reconcile recent spectral data with predictions of the standard cooling flow model, it has been suggested that the metals in the intracluster medium (ICM) might be distributed...
A Chandra observation of the H2O megamaser IC2560 (2002)
Iwasawa, K., Maloney, P. R., Fabian, A. C.
A short Chandra ACIS-S observation of the Seyfert 2 galaxy IC 2560, which hosts a luminous nuclear water megamaser, shows: 1) the X-ray emission is extended; 2) the X-ray spectrum shows emission...
Revealing the Focused Companion Wind in Cygnus X-1 with Chandra (2002)
Miller, J. M., Wojdowski, P., Schulz, N. S., Marshall, H. L., Fabian, A. C., Remillard, R. A., ...
We have analyzed a Chandra HETGS spectrum of the Galactic black hole Cygnus X-1, obtained at a source flux which is approximately twice that commonly observed in its persistent low-intensity,...
Allen, S. W., Schmidt, R. W., Fabian, A. C., Ebeling, H.
We present precise constraints on the normalization of the power spectrum of mass fluctuations in the nearby universe, sigma_8, as a function of the mean local matter density, Omega_m. Using the...
The peculiar cooling flow cluster RX J0820.9+0752 (2002)
Bayer-Kim, C. M., Crawford, C. S., Allen, S. W., Edge, A. C., Fabian, A. C.
(Abridged) We present observations of the cluster of galaxies associated with the X-ray source RX J0820.9+0752 and its dramatic central cluster galaxy (CCG) in the optical and X-ray wavebands.Unlike...
The Chandra HETGS and RXTE view of GRS 1915+105 (2002)
Lee, J. C., Reynolds, C. S., Remillard, R., Schulz, N. S., Blackman, E. G., Fabian, A. C.
The Chandra AO1 HETGS observation of the micro-quasar GRS 1915+105 in the low hard state reveals (1) neutral K absorption edges from Fe, Si, Mg, and S in cold gas, and (2) highly ionized (Fe XXV and...
Vaughan, S., Boller, Th., Fabian, A. C., Ballantyne, D. R., Brandt, W. N., Trumper, J.
We present an XMM-Newton observation of the bright, narrow-line, ultrasoft Seyfert 1 galaxy Ton S180. The 0.3-10 keV X-ray spectrum is steep and curved, showing a steep slope above 2.5 keV (Gamma ~...
The peculiar cooling flow cluster RX J0820.9+0752 (2002)
Bayer-Kim, C. M., Crawford, C. S., Allen, S. W., Edge, A. C., Fabian, A. C.
This poster is a summary of a paper on the subject (Bayer-Kim et al. 2002) that has been submitted for publication in MNRAS. We present X-ray, H alpha, radio, and optical data, both imaging and...
Chandra temperature and metallicity maps of the Perseus cluster core (2002)
Schmidt, R. W., Fabian, A. C., Sanders, J. S.
We present temperature and metallicity maps of the Perseus cluster core obtained with the Chandra X-ray Observatory. We find an overall temperature rise from ~3.0 keV in the core to ~5.5 keV at 120...
Miller, J. M., Fabian, A. C., Reynolds, C. S., Wijnands, R., Nowak, M. A., ...
Broad Fe K-alpha emission lines have recently been reported in a number of Galactic black holes. Such lines are useful accretion flow diagnostics because they may be produced at the inner accretion...
On conduction, cooling flows and galaxy formation (2002)
Fabian, A. C., Voigt, L. M., Morris, R. G.
On the basis of the universal gas fraction in clusters of galaxies, we estimate that the effective thermal conductivity required to balance radiative cooling in the cores, where the gas temperature...
VLT near-infrared spectra of hard serendipitous Chandra sources (2002)
Gandhi, P., Crawford, C. S., Fabian, A. C.
We present near-infrared long-slit spectra of eight optically-dim X-ray sources obtained with ISAAC on the Very Large Telescope. Six of the sources have hard X-ray emission with a significant...
A survey of molecular hydrogen in the central galaxies of cooling flows (2002)
Edge, A. C., Wilman, R. J., Johnstone, R. M., Crawford, C. S., Fabian, A. C., Allen, S. W.
We present a large sample of H- and K-band spectra of 32 optically line luminous central cluster galaxies. We find significant rovibrational H_2 emission in 23 of these galaxies as well as H...
Exciting molecular hydrogen in the central galaxies of cooling flows (2002)
Wilman, R. J., Edge, A. C., Johnstone, R. M., Fabian, A. C., Allen, S. W., Crawford, C. S.
The origin of rovibrational H_2 emission in the central galaxies of cooling flow clusters is poorly understood. Here we address this issue using data from our near-infrared spectroscopic survey of 32...
Multiple X-ray reflection from ionized slabs (2002)
Ross, R. R., Fabian, A. C., Ballantyne, D. R.
Multiple reflection of X-rays may be important when an accretion disc and its hot corona have a complicated geometry, or if returning radiation due to gravitational light bending is important, or in...
A long hard look at MCG-6-30-15 with XMM-Newton (2002)
Fabian, A. C., Vaughan, S., Nandra, K., Iwasawa, K., Ballantyne, D. R., Lee, J. C., ...
We present first results from a 325 ks observation of the Seyfert 1 galaxy MCG-6-30-15 with XMM-Newton and BeppoSAX. The strong, broad, skewed iron line is clearly detected and is well characterised...
The complex iron line in NGC 7469 observed by BeppoSAX (2002)
De Rosa, A., Fabian, A. C., Piro, L.
In this letter we present analysis of BeppoSAX data from a long look at the Seyfert 1 galaxy NGC 7469. The presence of a soft excess below 0.8 keV is confirmed by our analysis and no warm absorber...
Allen, S. W., Schmidt, R. W., Fabian, A. C.
We present precise measurements of the X-ray gas mass fraction for a sample of luminous, relatively relaxed clusters of galaxies observed with the Chandra Observatory, for which independent...
Chandra reveals a double-sided X-ray jet in the quasar 3C9 at z=2.012 (2002)
Fabian, A. C., Celotti, A., Johnstone, R. M.
A Chandra observation of the radio-loud quasar 3C9 at redshift z=2.012 has revealed extended X-ray emission coincident with the radio jet. Of particular interest is the appearance of both jet and...
Reflection Spectra from Photoionized Accretion Discs (2002)
Ballantyne, D. R., Ross, R. R., Fabian, A. C.
We review recent progress on the modeling and use of reflection spectra from irradiated and ionized accretion discs. On the computational side, calculations of reflection spectra from discs with...
Lee, J. C., Iwasawa, K., Houck, J. C., Fabian, A. C., Marshall, H. L., Canizares, C. R.
We confirm the detection of the relativistically broadened iron K-alpha emission at 6.4 keV with simultaneous Chandra HETGS and RXTE PCA observations. Heavily binned HETGS data show a disk line...
Conduction and cooling flows (2002)
Voigt, L. M., Schmidt, R. W., Fabian, A. C., Allen, S. W., Johnstone, R. M.
Chandra and XMM-Newton observations have confirmed the presence of large temperature gradients within the cores of many relaxed clusters of galaxies. Here we investigate whether thermal conduction...
The physical conditions within dense cold clouds in cooling flows II (2002)
Ferland, G. J., Fabian, A. C., Johnstone, R. M.
This is a progress report on our numerical simulations of conditions in the cold cores of cooling flow condensations. The physical conditions in any non-equilibrium plasma are the result of a host of...
Fabian, A. C., Crawford, C. S., Iwasawa, K.
We report a Chandra observation of the z=3.395 radio galaxy B2 0902+343. The unresolved X-ray source is centred on the active nucleus. The spectrum is well fit by a flat power law of photon index of...
Shih, D. C., Iwasawa, K., Fabian, A. C.
We report on an analysis in the 3--10 keV X-ray band of the long 1999 ASCA observation of MCG--6-30-15. The time-averaged broad iron K line is well-described by disk emission near a Schwarzschild...
Miller, J. M., Fabian, A. C., Wijnands, R., Reynolds, C. S., Ehle, M., Freyberg, M. J., ...
We observed the Galactic black hole candidate XTE J1650-500 early in its Fall, 2001 outburst with the XMM-Newton European Photon Imaging pn Camera (EPIC-pn). The observed spectrum is consistent with...
How the X-ray spectrum of a Narrow-Line Seyfert 1 galaxy may be reflection dominated (2002)
Fabian, A. C., Ballantyne, D. R., Merloni, A., Vaughan, S., Iwasawa, K., Boller, Th.
A model for the inner regions of accretion flows is presented where, due to disc instabilities, cold and dense material is clumped into deep sheets or rings. Surrounding these density enhancements is...
Study of X-ray reflection features in a sample of Sy 1s observed by BeppoSAX (2002)
De Rosa, A., Fabian, A. C., Piro, L., Ballantyne, D. R.
The ionized disc reflection model of Ross & Fabian is applied to a sample of five Seyfert 1 galaxies observed by BeppoSAX. Good fits were obtained for all the objects in the sample. NGC 4051 and Mkn...
Ballantyne, D. R., Ross, R. R., Fabian, A. C.
We consider the properties of soft X-ray emission lines in the reprocessed emission from a photoionized accretion disc. Observations of these lines will be important in determining the ionization...
Chandra observations of Abell 2199 (2002)
Johnstone, R. M., Allen, S. W., Fabian, A. C., Sanders, J. S.
We present results from an analysis of two Chandra observations of the rich, nearby galaxy cluster Abell 2199. We find evidence (having corrected for projection effects) for radial gradients in...
Miller, J. M., Fabian, A. C., Wijnands, R., Remillard, R. A., Wojdowski, P., Schulz, N. S., ...
We observed the Galactic black hole Cygnus X-1 with the Chandra High Energy Transmission Grating Spectrometer for 30 kiloseconds on 4 January, 2001. The source was in an intermediate state, with a...
Magnetic flares and outflows from structured accretion disc coronae (2002)
We present a model for magnetic structured coronae above accretion discs. On the shortest timescales, spatially and temporally correlated coronal flares can explain X-ray temporal and spectral...
Powerful obscured AGN in Chandra cluster fields (2002)
Gandhi, P., Fabian, A. C., Crawford, C. S.
Models for the origin of the hard X-ray background have suggested that sources with the most accretion activity lie hidden in highly obscured AGN. We report on our study of hard, serendipitous...
On the hard X-ray spectra of radio-loud active galaxies (2002)
Ballantyne, D. R., Ross, R. R., Fabian, A. C.
Over the last few years X-ray observations of broad-line radio galaxies (BLRGs) by ASCA, RXTE and BeppoSAX have shown that these objects seem to exhibit weaker X-ray reflection features (such as the...
Cooling flows in clusters of galaxies (2002)
The gas temperature in the cores of many clusters of galaxies drops inward by about a factor of three or more within the central 100kpc radius. The radiative cooling time drops over the same region...
Revealing evidence of spin in galactic black holes (2002)
Miller, J.M., Fabian, A.C., Reynolds, C.S., Nowak, M., Wijnands, R., Homan, J., ...
X-ray Absorption Lines in the Galactic Black Hole Candidate XTE J1650-500 (2002)
Miller, J.M., Wijnands, R.A.D., Wojdowski, P., Groot, P.J., Fabian, A.C., Klis, M. Van Der, ...
Vaughan, S., Boller, T., Fabian, A. C., Ballantyne, D. R., Brandt, W. N., Trümper, J.
We present an XMM-Newton observation of the bright, narrow- line, ultrasoft type 1 Seyfert galaxy Ton S180. The 0.3-10 keV X-ray spectrum is steep and curved, showing a steep slope above 2.5 keV...
Miller, J. M., Fabian, A. C., Wijnands, R., Reynolds, C. S., Ehle, M., Freyberg, M. J., ...
We observed the Galactic black hole candidate XTE J1650-500 early in its fall of 2001 outburst with the XMM-Newton European Photon Imaging pn Camera (EPIC-pn). The observed spectrum is consistent...
How the X-ray spectrum of a narrow-line Seyfert 1 galaxy may be reflection-dominated (2002)
Fabian, A. C., Ballantyne, D. R., Merloni, A., Vaughan, S., Iwasawa, K., Boller, Th.
A model for the inner regions of accretion flows is presented where, owing to disc instabilities, cold and dense material is clumped into deep sheets or rings. Surrounding these density enhancements...
Boller, Th., Fabian, A. C., Sunyaev, R., Trümper, J., Vaughan, S., Ballantyne, D. R., ...
We report the first detection of a sharp spectral feature in a narrow-line Seyfert 1 galaxy. Using XMM-Newton we have observed 1H 0707 - 495 and find a drop in flux by a factor of more than 2 at a...
Boller, T., Fabian, A. C., Sunyaev, R., Trümper, J., Vaughan, S., Ballantyne, D. R., ...
We report the first detection of a sharp spectral feature in a narrow-line Seyfert 1 galaxy. Using XMM-Newton we have observed 1H 0707 - 495 and find a drop in flux by a factor of more than 2 at a...
Chandra and RXTE spectroscopy of the Galactic microquasar XTE J1550-564 in outburst (2002)
Miller, J. M., Marshall, H. L., Wijnands, R., Di Matteo, T., Fox, D. W., Kommers, J., ...
On two occasions, we obtained nearly simultaneous similar or equal to4 ks snapshot observations of the Galactic black hole and microquasar XTE J1550-564 with Chandra and RXTE near the peak of its...
Miller, J. M., Fabian, A. C., Wijnands, R., Remillard, R. A., Wojdowski, P., Schulz, N. S., ...
We observed the Galactic black hole Cyg X-1 with the Chandra High Energy Transmission Grating Spectrometer for 30 ks on 2001 January 4. The source was in an intermediate state, with a flux that was...
A long hard look at MCG-6-20-15 with XMM-Newton (2002)
Fabian, A.C., Vaughan, Simon A., Nandra, K., Iwasawa, K., Ballantyne, D.R., Lee, J.C., ...
Coronal outflow dominated accretion discs: a new possibility for low luminosity black holes? (2001)
The spectral energy distributions of galactic black holes in the low/hard state and of low-luminosity AGN possess many common features, the most prominent being: compact, flat (or inverted) spectrum...
Fe K\alpha emission from photoionized slabs: the impact of the iron abundance (2001)
Ballantyne, D. R., Fabian, A. C., Ross, R. R.
Iron K\alpha emission from photoionized and optically thick material is observed in a variety of astrophysical environments including X-ray binaries, active galactic nuclei, and possibly gamma-ray...
Deep inside the core of Abell 1795: the Chandra view (2001)
Ettori, S., Fabian, A. C., Allen, S. W., Johnstone, R. M.
We present X-ray spatial and spectral analysis of the Chandra data from the central 400 kpc (H0 = 50 km/s/Mpc) of the cluster of galaxies Abell 1795. The plasma temperature rises outwards by a factor...
The properties of the X-ray holes in the intracluster medium of the Perseus cluster (2001)
Fabian, A. C., Celotti, A., Blundell, K. M., Kassim, N. E., Perley, R. A.
High resolution X-ray and low frequency radio imaging now allow us to examine in detail the interaction and physical properties of the radio source 3C84 and the surrounding thermal gas. The radiative...
On the detectability of distant Compton-thick obscured quasars (2001)
Fabian, A. C., Wilman, R. J., Crawford, C. S.
Chandra and XMM-Newton have resolved the 2-8 keV X-ray Background (XRB) into point sources. Many of the fainter sources are obscured active galactic nuclei (AGN) with column densities in the range of...
Allen, S. W., Schmidt, R. W., Fabian, A. C.
We present Chandra observations of RXJ1347.5-1145, the most X-ray luminous cluster of galaxies known. We report the discovery of a region of relatively hot, bright X-ray emission, located...
Lee, J. C., Reynolds, C. S., Schulz, N. S., Remillard, R., Blackman, E. G., Fabian, A. C.
The time-averaged 30 ks Chandra HETGS observation of the micro-quasar GRS 1915+105 in the low hard state reveals for the first time in this source neutral K absorption edges from Fe, Si, Mg, & S....
Miller, J. M., Ballantyne, D. R., Fabian, A. C., Lewin, W. H. G.
We have simultaneously fit Chandra and RXTE spectra of the Galactic black hole XTE J1118+480 with three models for X-ray reflection. We explored a range of accretion disc ionizations (log(xi)=1-4;...
The X-ray virial relations for relaxed lensing clusters observed with Chandra (2001)
Allen, S. W., Schmidt, R. W., Fabian, A. C.
We examine the relations linking mass, X-ray temperature and bolometric luminosity for a sample of luminous, relatively relaxed clusters of galaxies observed with the Chandra Observatory, for which...
Lee, J. C., Canizares, C. R., Marshall, H. L., Fabian, A. C., Morales, R., Schulz, N. S., ...
The Chandra HETGS spectra of the Seyfert 1 galaxy MCG--6-30-15 show numerous narrow, unresolved (FWHM < 200 km/s) absorption lines from a wide range of ionization states of N, O, Mg, Ne, Si, S, Ar,...
Boller, Th., Fabian, A. C., Sunyaev, R., Truemper, J., Vaughan, S., Ballantyne, D. R., ...
We report the first detection of a sharp spectral feature in a Narrow-Line Seyfert 1 galaxy. Using XMM-Newton we have observed 1H0707-495 and find a drop in flux by a factor of more than 2 at a...
Cluster cores as observed with Chandra (2001)
We review recent results from Chandra observations of the X-ray bright cores of clusters of galaxies. We discuss the detection of ``cold fronts'' and their implication for thermal conduction, the...
The intracluster iron distribution around 4C+55.16 (2001)
Iwasawa, K., Fabian, A. C., Allen, S. W., Ettori, S.
We report on the metal distribution in the intracluster medium around the radio galaxy 4C+55.16 (z=0.24) observed with the Chandra X-ray Observatory. The radial metallicity profile shows a dramatic...
BeppoSAX view of NGC 526A: a Seyfert 1.9 galaxy with a flat spectrum (2001)
Landi, R., Bassani, L., Malaguti, G., Cappi, M., Comastri, A., Dadina, M., ...
In the present work we report the BeppoSAX observation of the Seyfert 1.9 galaxy NGC 526A in the band 0.1-150 keV. The high energy instrument onboard, PDS, has succeeded in measuring for the first...
Spatially-resolved X-ray spectroscopy of the core of the Centaurus cluster (2001)
We present Chandra data from a 31.7 ks observation of the Centaurus cluster, using the ACIS-S detector. Images of the X-ray emission show a plume-like feature at the centre of the cluster, of extent...
Magnetic fields in the Centaurus cluster (2001)
Taylor, G. B., Fabian, A. C., Allen, S. W.
We present multi-frequency VLA observations of the radio galaxy PKS 1246-410 at the center of the Centaurus Cluster, and compare these results to recent Chandra observations. The unusual radio...
Obscured Accretion and Black Holes (2001)
The evidence for obscured AGN and in particular for obscured quasars is discussed. The spectrum and source modelling of the X-ray Background suggests that most massive black holes grow by obscured...
Weighing black holes with warm absorbers (2001)
We present a new technique for determining an upper limit for the mass of the black hole in active galactic nuclei showing warm absorption features. The method relies on the balance of radiative and...
X-ray observations of Seyfert 1 galaxies offer the unique possibility of observing spectral variability on timescales comparable to the dynamical time of the inner accretion flow. They typically show...
Chandra observations of the galaxy cluster Abell 1835 (2001)
Schmidt, R. W., Allen, S. W., Fabian, A. C.
We present the analysis of 30 ksec of Chandra observations of the galaxy cluster Abell 1835. Overall, the X-ray image shows a relaxed morphology, although we detect substructure in in the inner 30...
Multi-wavelength observations of serendipitous Chandra sources (2001)
Gandhi, P., Crawford, C. S., Fabian, A. C., Wilman, R. J., Johnstone, R. M., Barger, A. J., ...
We describe progress in a programme to study a sample of sources typical of those which contribute a large fraction of the hard X-ray background. The sources are selected from the fields of...
Multi-wavelength observations of serendipitous Chandra X-ray sources in the field of A2390 (2001)
Crawford, C. S., Gandhi, P., Fabian, A. C., Wilman, R. J., Johnstone, R. M., Barger, A. J., ...
We present optical spectra and near-infrared imaging of a sample of serendipitous X-ray sources detected in the field of Chandra observations of the A2390 cluster of galaxies. The sources have 0.5-7...
Relativistic ionized accretion disc models of MCG--6-30-15 (2001)
Ballantyne, D. R., Fabian, A. C.
We present results from fitting ionized accretion disc models to three long ASCA observations of the Seyfert 1 galaxy MCG--6-30-15. All three datasets can be fit by a model consisting of ionized...
Magnetic Fields in the 3C 129 Cluster (2001)
Taylor, G. B., Govoni, F., Allen, S. A., Fabian, A. C.
We present multi-frequency VLA observations of the two radio galaxies 3C 129 and 3C 129.1 embedded in a luminous X-ray cluster. These radio observations reveal a substantial difference in the Faraday...
Nuclear obscuration in the high-ionization Seyfert 2 galaxy Tol 0109-383 (2001)
Iwasawa, K., Matt, G., Fabian, A. C., Bianchi, S., Brandt, W. N., Guainazzi, M., ...
We report the BeppoSAX detection of a hard X-ray excess in the X-ray spectrum of the classical high-ionization Seyfert 2 galaxy Tol0109-383. The X-ray emission of this source observed below 7 keV is...
X-rays and accretion discs as probes of the strong gravity of black holes (2001)
The observations and interpretation of broad iron lines in the X-ray spectra of Seyfert 1 galaxies are reviewed. The line profiles observed from MCG--6-30-15 and NGC 3516 show extended red wings to...
Deep Sky Objects and the X-ray Background (2001)
Deep observations of the X-ray Sky have now resolved most of the X-ray Background. Obscured active galaxies are a key component. The obscured objects which dominate at fluxes above...
Iwasawa, K., Matt, G., Guainazzi, M., Fabian, A. C.
We present X-ray results on the ultraluminous infrared galaxy Arp220 obtained with BeppoSAX. The X-ray emission up to 10 keV is detected. No significant signal is detected with the PDS detector in...
The interaction of radio sources and cooling flows (2001)
The X-ray emission in many clusters of galaxies shows a central peak in surface brightness coincident with a drop in temperature. These characterize a cooling flow. There is often a radio source also...
A Complete Relativistic Ionized Accretion Disc in Cygnus X-1 (2001)
Young, A. J., Fabian, A. C., Ross, R. R., Tanaka, Y.
The galactic black hole candidate Cygnus X-1 is observed to be in one of two X-ray spectral states; either the low/hard (low soft X-ray flux and a flat power law tail) or high/soft (high...
Chandra and RXTE Spectroscopy of the Galactic Microquasar XTE J1550-564 in Outburst (2001)
Miller, J. M., Marshall, H. L., Wijnands, R., Di Matteo, T., Fox, D. W., Kommers, J., ...
On two occasions, we obtained nearly simultaneous ~ 4 kilosecond snapshot observations of the Galactic black hole and microquasar XTE J1550-564 with Chandra and RXTE near the peak of its May, 2000...
X-ray, Optical, and Radio Observations of the Type II Supernovae 1999em and 1998S (2001)
Pooley, D., Lewin, W. H. G., Fox, D. W., Miller, J. M., Lacey, C. K., Van Dyk, S. D., ...
Observations of the Type II-P (plateau) Supernova (SN) 1999em and Type IIn (narrow emission line) SN 1998S have enabled estimation of the profile of the SN ejecta, the structure of the circumstellar...
Detecting high redshift evolved galaxies as the hosts of optically faint hard X-ray sources (2001)
Cowie, L. L., Barger, A. J., Bautz, M. W., Capak, P., Crawford, C. S., Fabian, A. C., ...
We combine deep Subaru near-infrared images of the massive lensing clusters A2390 and A370 with Keck optical data to map the spectral energy distributions (SEDs) of Chandra X-ray sources lying behind...
Ionized Iron Lines in X-ray Reflection Spectra (2001)
Ballantyne, D. R., Ross, R. R., Fabian, A. C.
We present results from new calculations of the X-ray reflection spectrum from ionized accretion discs. These computations improve on our previous models by including the condition of hydrostatic...
X-ray Reflection By Photoionized Accretion Discs (2001)
Ballantyne, D. R., Ross, R. R., Fabian, A. C.
We present the results of reflection calculations that treat the relevant physics with a minimum of assumptions. The temperature and ionization structure of the top five Thomson depths of an...
Chandra detection of the intracluster medium around 3C294 at z=1.786 (2001)
Fabian, A. C., Crawford, C. S., Ettori, S., Sanders, J. S.
We present a Chandra observation of the powerful radio galaxy 3C294 showing clear evidence for a surrounding intracluster medium. At a redshift of 1.786 this is the most distant cluster of galaxies...
The blazar GB1428+4217: a warm absorber at z=4.72? (2001)
Fabian, A. C., Celotti, A., Iwasawa, K., Ghisellini, G.
BeppoSAX observations of the high redshift (z=4.72) blazar GB 1428+4217 confirm the presence of a complex soft X-ray spectrum first seen with the ROSAT PSPC. Flattening below a rest frame energy of 5...
Chandra X-ray observations of the 3C295 cluster core (2001)
Allen, S. W., Taylor, G. B., Nulsen, P. E. J., Johnstone, R. M., David, L. P., Ettori, S., ...
We examine the properties of the X-ray gas in the central regions of the distant (z=0.46), X-ray luminous cluster of galaxies surrounding the powerful radio source 3C 295, using observations made...
Revealing the Dusty Warm Absorber in MCG--6-30-15 with the Chandra HETG (2001)
Lee, J. C., Ogle, P. M., Canizares, C. R., Marshall, H. L., Schulz, N. S., Morales, R., ...
We present detailed evidence for a warm absorber in the Seyfert 1 galaxy MCG--6-30-15 and dispute earlier claims for relativistic O line emission. The HETG spectra show numerous narrow, unresolved...
Di Matteo, T., Johnstone, R. M., Allen, S. W., Fabian, A. C.
Chandra observations of low-luminosity supermassive black holes in nearby elliptical galaxies provide tight limits on both their nuclear luminosities and on their Bondi accretion rates. We examine...
Chandra--ASCA--RXTE observations of the micro-quasar GRS 1915+105 (2000)
Lee, J. C., Schulz, N. S., Reynolds, C. S., Fabian, A. C., Blackman, E. G.
A Chandra AO1 30ks HETGS observation of the X-ray transient micro-quasar GRS 1915+105 reveals absorption edges and faint line emission over the HETG energy range. We find from a preliminary analysis...
PMN J0525-3343: soft X-ray spectral flattening in a blazar at z=4.4 (2000)
Fabian, A. C., Celotti, A., Iwasawa, K., McMahon, R. G., Carilli, C. L., Brandt, W. N., ...
We report optical, radio and X-ray observations of a new distant blazar, PMN J0525-3343, at a redshift of 4.4. The X-ray spectrum measured from ASCA and BeppoSAX flattens below a few keV, in a manner...
Chandra imaging of the X-ray core of Abell 1795 (2000)
Fabian, A. C., Sanders, J. S., Ettori, S., Taylor, G. B., Allen, S. W., Crawford, C. S., ...
We report the discovery of a 40 arcsec long X-ray filament in the core of the cluster of galaxies A1795. The feature coincides with an Halpha+NII filament found by Cowie et al in the early 1980s and...
Chandra detection of reflected X-ray emission from the type 2 QSO in IRAS 09104+4109 (2000)
Iwasawa, K., Fabian, A. C., Ettori, S.
We present X-ray imaging spectroscopy of the extremely luminous infrared galaxy IRAS 09104+4109 (z=0.442) obtained with the Chandra X-ray Observatory. With the arcsec resolution of Chandra, an...
Adaptive binning of X-ray galaxy cluster images (2000)
We present a simple method for adaptively binning the pixels in an image. The algorithm groups pixels into bins of size such that the fractional error on the photon count in a bin is less than or...
Evidence for Ionised Accretion Discs in Five Narrow-Line Seyfert 1 Galaxies (2000)
Ballantyne, D. R., Iwasawa, K., Fabian, A. C.
(Abridged) We present the results of fitting ASCA spectra of six narrow-line Seyfert 1 (NLS1) galaxies with the ionised reflection models of Ross & Fabian (1993). We find that five of the galaxies...
UV observations of the galaxy cluster Abell 1795 with the optical monitor on XMM-Newton (2000)
Mittaz, J. P., Kaastra, J. S., Tamura, T., Fabian, A. C., Mushotzky, R. F., Peterson, J. R., ...
We present the results of an analysis of broad band UV observations of the central regions of Abell 1795 observed with the optical monitor on XMM-Newton. As have been found with other UV observations...
XTE J1118+480: Clues on the Nature of the Accretion Flow from the Optical Variability (2000)
Merloni, A., Di Matteo, T., Fabian, A. C.
We show how the simultaneous presence of a strong quasi periodic oscillation (QPO) of period of about 10 seconds in the optical and X-ray lightcurves of the X-ray transient XTE J1118+480 can be used...
X-ray Imaging Spectroscopy of Abell 1835 (2000)
Peterson, J. R., Paerels, F. B. S., Kaastra, J. S., Arnaud, M., Reiprich, T. H., Fabian, A. C., ...
We present detailed spatially-resolved spectroscopy results of the observation of Abell 1835 using the European Photon Imaging Cameras (EPIC) and the Reflection Grating Spectrometers (RGS) on the...
On the soft X-ray spectrum of cooling flows (2000)
Fabian, A. C., Mushotzky, R. F., Nulsen, P. E. J., Peterson, J. R.
Strong evidence for cooling flows has been found in low resolution X-ray imaging and spectra of many clusters of galaxies. However high resolution X-ray spectra of several clusters from the...
X-ray Spectroscopy of the Cluster of Galaxies Abell 1795 with XMM-Newton (2000)
Tamura, T., Kaastra, J. S., Peterson, J. R., Paerels, F., Mittaz, J. P. D., Trudolyubov, S. P., ...
The initial results from XMM-Newton observations of the rich cluster of galaxies Abell 1795 are presented. The spatially-resolved X-ray spectra taken by the European Photon Imaging Cameras (EPIC)...
Ettori, S., Allen, S. W., Fabian, A. C.
We present an analysis of BeppoSAX observations of three clusters of galaxies which are amongst the most luminous in the Universe: RXJ1347-1145, Zwicky 3146 and Abell 2390. Using data from both the...
Accretion disc coronae as magnetic reservoirs (2000)
Most astrophysical sources powered by accretion onto a black hole, either of stellar mass or supermassive, when observed with hard X-rays show signs of a hot Comptonizing component in the flow, the...
Chandra measurements of the distribution of mass in the luminous lensing cluster Abell 2390 (2000)
Allen, S. W., Ettori, S., Fabian, A. C.
We present spatially-resolved X-ray spectroscopy of the luminous lensing cluster Abell 2390, using observations made with the Chandra observatory. The temperature of the X-ray gas is shown to rise...
Hot dust in two hard Chandra X-ray sources (2000)
Wilman, R. J., Fabian, A. C., Gandhi, P.
The two brightest hard X-ray sources discovered serendipitously by Chandra in the field of the lensing cluster A2390 are found to have ISOCAM counterparts at 6.7 and 15 micron. We use this fact,...
A physical model for the hard X-ray background (2000)
Wilman, R. J., Fabian, A. C., Nulsen, P. E. J.
We combine a semi-analytic galaxy formation model (Nulsen and Fabian 1997) with a prescription for the obscured growth of massive black holes (Nulsen and Fabian 2000; Fabian 1999), to reproduce the...
Chandra imaging of the complex X-ray core of the Perseus cluster (2000)
Fabian, A. C., Sanders, J. S., Ettori, S., Taylor, G. B., Allen, S. W., Crawford, C. S., ...
We report subarcsec-resolution X-ray imaging of the core of the Perseus cluster around the galaxy NGC 1275 with the Chandra X-ray Observatory. The ROSAT-discovered holes associated with the radio...
Chandra constraints on the thermal conduction in the intracluster plasma of A2142 (2000)
In this Letter, we use the recent Chandra observation of A2142 reported by Markevitch et al. to put constraints on thermal conduction in the intracluster plasma. We show that the observed sharp...
Molecular hydrogen emission in Cygnus A (2000)
Wilman, R. J., Edge, A. C., Johnstone, R. M., Crawford, C. S., Fabian, A. C.
We present J, H and K-band spectroscopy of Cygnus A, spanning 1.0-2.4 micron in the rest-frame and hence several rovibrational H2, H recombination and [FeII] emission lines. The lines are spatially...
X-ray absorption and rapid variability of the dwarf Seyfert nucleus of NGC4395 (2000)
Iwasawa, K., Fabian, A. C., Almaini, O., Lira, P., Lawrence, A., Hayashida, K., ...
We report the detection of an absorbed central X-ray source and its strong, rapid variability in NGC4395, the least luminous Seyfert nucleus known. The X-ray source exhibits a number of flares with...
X-ray colour maps of the cores of galaxy clusters (2000)
Sanders, J. S., Fabian, A. C., Allen, S. W.
We present an analysis of X-ray colour maps of the cores of clusters of galaxies, formed from the ratios of counts in different X-ray bands. Our technique groups pixels lying between contours in an...
Magnetic flares and the optical variability of the X-ray transient XTE J1118+480 (2000)
Merloni, A., Di Matteo, T., Fabian, A. C.
The simultaneous presence of a strong quasi periodic oscillation of period of about 10 seconds in the optical and X-ray lightcurves of the X-ray transient XTE J1118+480 suggests that a significant...
Limits on the accretion rates onto massive black holes in nearby galaxies (2000)
Di Matteo, T., Carilli, C. L., Fabian, A. C.
The radio emission from supermassive black holes in nearby early-type galaxies can be used to test possible explanations for their low luminosities. We calculate the expected contribution from...
Infrared observations of serendipitous hard Chandra X-ray sources (2000)
Crawford, C. S., Fabian, A. C., Gandhi, P., Wilman, R. J., Johnstone, R. M.
We present observations of a sample of optically-faint, hard X-ray sources of the kind likely to be responsible for much of the hard X-ray background. We confirm that such sources are easily detected...
The X-ray spectra of Compton-thick Seyfert 2 galaxies as seen by BeppoSAX (2000)
Matt, G., Fabian, A. C., Guainazzi, M., Iwasawa, K., Bassani, L., Malaguti, G.
Results from BeppoSAX observations of Compton--thick Seyfert 2 galaxies are summarized and reviewed, and their general properties derived and discussed. In five out of the seven observed sources, the...
Boller, Th., Fabian, A. C., Brandt, W. N., Freyberg, M. J.
We report on a ROSAT PSPC observation of the highly-luminous z = 4.72 radio-loud quasar GB 1428+4217 obtained between 1998 December 11 and 17, the final days of the ROSAT satellite. The low-energy...
Broad iron lines in Active Galactic Nuclei (2000)
Fabian, A. C., Iwasawa, K., Reynolds, C. S., Young, A. J.
An intrinsically narrow line emitted by an accretion disk around a black hole appears broadened and skewed as a result of the Doppler effect and gravitational redshift. The fluorescent iron line in...
The ROSAT Brightest Cluster Sample (BCS) - IV. The extended sample (2000)
Ebeling, H., Edge, A. C., Allen, S. W., Crawford, C. S., Fabian, A. C., Huchra, J. P.
We present a low-flux extension of the X-ray selected ROSAT Brightest Cluster Sample (BCS) published in Paper I of this series. Like the original BCS and employing an identical selection procedure,...
Testing the connection between the X-ray and submillimetre source populations using Chandra (2000)
Fabian, A. C., Smail, I., Iwasawa, K., Allen, S. W., Blain, A. W., Crawford, C. S., ...
The powerful combination of the Chandra X-ray telescope, the SCUBA submillimetre-wave camera and the gravitational lensing effect of the massive galaxy clusters A2390 and A1835 has been used to place...
An extended multi-zone model for the MCG-6-30-15 warm absorber (2000)
Morales, R., Fabian, A. C., Reynolds, C. S.
The variable warm absorber seen with {\em ASCA} in the X-ray spectrum of MCG$-$6-30-15 shows complex time behaviour in which the optical depth of OVIII anticorrelates with the flux whereas that of...
The role of X-ray observations for cosmological studies and conclusions is briefly explored. X-rays currently yield cosmologically interesting results on the abundances, evolution and gas content of...
The Energy Output of the Universe (2000)
The total energy emitted by the growth of massive black holes is large and can be 10-50 per cent of that emitted by stars in the universe. I show how the X-ray Background provides a good measure of...
XEUS - the X-ray Evolving Universe Spectroscopy Mission (2000)
Parmar, A.N., Peacock, T., Bavdaz, M., Hasinger, G., Arnaud, M., Barcons, X., ...
An extended multi-zone model for the MCG-6-30-15 warm absorber (2000)
Fabian , A. C., Morales , R., Reynolds , C. S.
The variable warm absorber seen with ASCA in the X-ray spectrum of MCG{ 6-30-15 shows complex time behaviour in which the optical depth of O VIII anticor- relates with the ux whereas that of O VII is...
An Extended Multi-Zone Model For The Mcg-6-30-15 Warm Absorber (2000)
R. Morales, A. C. Fabian, C. S. Reynolds
The variable warm absorber seen with ASCA in the X-ray spectrum of MCG-- 6-30-15 shows complex time behaviour in which the optical depth of O VIII anticorrelates with the flux whereas that of O VII...
An Extended Multi-Zone Model for the MCG-6-30-15 Warm Absorber (2000)
R. Morales, A. C. Fabian, C. S. Reynolds
The variable warm absorber seen with ASCA in the X-ray spectrum of MCG-6-30-15 shows complex time behaviour in which the optical depth of O VIII anticorrelates with the ux whereas that of O VII is...
Zw 1718.1-0108: a highly disturbed galaxy cluster at low Galactic latitude (1999)
Iwasawa, K., Ettori, S., Fabian, A. C., Edge, A. C., Ebeling, H.
We report the discovery of highly distorted X-ray emission associated with the nearby cluster Zw1718.1-0108, one of whose dominant members is the powerful radio galaxy 3C353. This cluster has been...
XEUS - The X-ray Evolving Universe Spectroscopy Mission (1999)
Parmar, A. N., Peacock, T., Bavdaz, M., Hasinger, G., Arnaud, M., Barcons, X., ...
XEUS is under study by ESA as part of the Horizon 2000+ program to utilize the International Space Station (ISS) for astronomical applications. XEUS will be a long-term X-ray observatory with an...
On the interpretation of the multicolour disc model for black hole candidates (1999)
Merloni, A., Fabian, A. C., Ross, R. R.
We present a critical analysis of the usual interpretation of the multicolour disc model parameters for black hole candidates in terms of the inner radius and temperature of the accretion disc. Using...
ASCA and ROSAT observations of nearby cluster cooling flows (1999)
Allen, S. W., Fabian, A. C., Johnstone, R. M., Arnaud, K. A., Nulsen, P. E. J.
We present a detailed analysis of the X-ray properties of the cooling flows in a sample of nearby, X-ray bright clusters of galaxies using high-quality ASCA spectra and ROSAT X-ray images. We...
Wu, K. K. S., Fabian, A. C., Nulsen, P. E. J.
Almost all of the extragalactic X-ray background (XRB) at 0.25 keV can be accounted for by radio-quiet quasars, allowing us to derive an upper limit of 4 \bgunit\ for the remaining background at 0.25...
Fuelling quasars with hot gas (1999)
Nulsen, P. E. J., Fabian, A. C.
We consider a model for quasar formation in which massive black holes are formed and fuelled largely by the accretion of hot gas during the process of galaxy formation. In standard hierarchical...
BeppoSAX unveils the nuclear component in NGC 6240 (1999)
Vignati, P., Molendi, S., Matt, G., Guainazzi, M., Antonelli, L. A., Bassani, L., ...
The direct nuclear X-ray emission of the ultraluminous IRAS galaxy NGC 6240 has been observed for the first time by BeppoSAX. It is seen through an absorber with N_H=2*10^{24} cm^{-2}. The 2-10 keV...
The obscured growth of massive black holes (1999)
The mass density of massive black holes observed locally is consistent with the hard X-ray Background provided that most of the radiation produced during their growth was absorbed by surrounding gas....
Lee, J. C., Fabian, A. C., Brandt, W. N., Reynolds, C. S., Iwasawa, K.
We report on a joint ASCA and RXTE observation spanning an $\sim$ 400~ks time interval of the bright Seyfert~1 galaxy MCG--6-30-15. The data clearly confirm the presence of a broad skewed iron line...
Fitting the spectrum of the X-ray background: the effects of high metallicity absorption (1999)
Recent work by Risaliti et al.(1999) suggests that more than half of all Seyfert 2 galaxies in the local universe are Compton-thick (N_H > 10^24 cm^-2). This has implications for AGN synthesis models...
Non-Gravitational Heating in the Hierarchical Formation of X-ray Clusters (1999)
Wu, K. K. S., Fabian, A. C., Nulsen, P. E. J.
The strong deviation in the properties of X-ray clusters from simple scaling laws highlights the importance of non-gravitational heating and cooling processes in the evolution of proto-cluster gas....
Variability of the extreme z=4.72 blazar, GB 1428+4217 (1999)
Fabian, A. C., Celotti, A., Pooley, G., Iwasawa, K., Brandt, W. N., McMahon, R. G., ...
We report X-ray and radio variability of GB 1428+4217 which confirm its blazar nature. IR observations reveal a powerful optical-UV component, not obscured by dust, which is suggestive of the...
SN 1988Z: Spectro-photometric catalogue and energy estimates (1999)
Aretxaga, I., Benetti, S., Terlevich, R. J., Fabian, A. C., Cappellaro, E., Turatto, M., ...
We present a spectro-photometric catalogue of the evolution of supernova 1988Z which combines new and published observations in the radio, optical and X-ray bands, with the aim of offering a...
Soft X-ray spectroscopy of Compton-thick Seyfert 2 galaxies with BeppoSAX (1999)
Guainazzi, M., Matt, G., Antonelli, L. A., Bassani, L., Fabian, A. C., Maiolino, R., ...
We present a X-ray spectroscopic study of the bright Compton-thick Seyfert 2s NGC1068 and the Circinus Galaxy, performed with BeppoSAX. Matt et al. (1997 and 1998) interpreted the spectrum above 4...
Hard X-ray emission from elliptical galaxies (1999)
Allen, S. W., Di Matteo, T., Fabian, A. C.
We report the detection of hard X-ray emission components in the spectra of six nearby, giant elliptical galaxies observed with the ASCA satellite. The systems studied, which exhibit strong dynamical...
Low radiative efficiency accretion in the nuclei of elliptical galaxies (1999)
Di Matteo, T., Quataert, E., Allen, S. W., Narayan, R., Fabian, A. C.
The discovery of hard, power-law X-ray emission from a sample of six nearby elliptical galaxies, including the dominant galaxies of the Virgo,Fornax and Centaurus clusters (M87, NGC 1399 and NGC...
Detection of X-ray emission from the host clusters of 3CR quasars (1999)
Crawford, C. S., Lehmann, I., Fabian, A. C., Bremer, M. N., Hasinger, G.
We report the detection of extended X-ray emission around several powerful 3CR quasars with redshifts out to 0.73. The ROSAT HRI images of the quasars have been corrected for spacecraft wobble and...
Variation of the broad X-ray iron line in MCG-6-30-15 during a flare (1999)
Iwasawa, K., Fabian, A. C., Young, A. J., Inoue, H., Matsumoto, C.
We report results on the broad iron emission line of the Seyfert galaxy MCG-6-30-15, obtained from the second long ASCA observation in 1997. The time-averaged profile of the broad line is very...
ASCA and ROSAT observations of NGC5548: discrepant spectral indices (1999)
Iwasawa, K., Fabian, A. C., Nandra, K.
We report on simultaneous ASCA and ROSAT observations of the Seyfert galaxy NGC5548 made during the ASCA Performance Verification phase. Spectral features due to a warm absorber and reflection are...
The optical variability of the narrow line Seyfert 1 galaxy IRAS 13224-3809 (1999)
Young, A. J., Crawford, C. S., Fabian, A. C., Brandt, W. N., O'Brien, P. T.
We report on a short optical monitoring programme of the narrow-line Seyfert 1 Galaxy IRAS 13224-3809. Previous X-ray observations of this object have shown persistent giant variability. The degree...
Crawford, C. S., Allen, S. W., Ebeling, H., Edge, A. C., Fabian, A. C.
We present new spectra of dominant galaxies in X-ray selected clusters, which combine with our previously published spectra to form a sample of 256 dominant galaxies in 215 clusters; 177 of these are...
X-ray reflection spectra from ionized slabs (1999)
Ross, R. R., Fabian, A. C., Young, A. J.
X-ray reflection spectra are an important component in the X-ray spectra of many active galactic nuclei and Galactic black hole candidates. It is likely that reflection takes place from highly...
X-ray and lensing results on the cluster around the powerful radio galaxy 4C+55.16 (1999)
Iwasawa, K., Allen, S. W., Fabian, A. C., Edge, A. C., Ettori, S.
We present results from ASCA and ROSAT HRI observations of the powerful radio galaxy 4C+55.16 at redshift 0.24. Extended soft X-ray emission is imaged by the ROSAT HRI. The X-ray brightness profile...
BeppoSAX observations of Mkn 3: Piercing through the torus of a Seyfert 2 galaxy (1999)
Cappi, M., Bassani, L., Comastri, A., Guainazzi, M., Maccacaro, T., Malaguti, G., ...
A new BeppoSAX broad-band (0.6-150 keV) spectrum of the Seyfert 2 galaxy Mkn 3 is presented. The spectrum provides a direct measurement of a large, neutral column of gas with Nh~10**24 cm**-2 in the...
ROSAT HRI Monitoring of Extreme X-ray Variability in the Narrow-Line Quasar PHL 1092 (1999)
Brandt, W. N., Boller, Th., Fabian, A. C., Ruszkowski, M.
We report results from an 18-day ROSAT HRI monitoring campaign on the ultrasoft Narrow-Line Seyfert 1 (NLS1) class quasar PHL 1092. This luminous, radio-quiet quasar showed strong X-ray variability...
We present a detailed and homogeneous analysis of the ROSAT PSPC surface brightness profiles of 36 clusters of galaxies with high X-ray luminosity (L_X > 10^{45} erg s^{-1}) and redshifts between...
BeppoSAX uncovers the hidden Seyfert 1 nucleus in the Seyfert 2 galaxy NGC 2110 (1999)
Malaguti, G., Bassani, L., Cappi, M., Comastri, A., DiCocco, G., Fabian, A. C., ...
The Seyfert 2 galaxy NGC 2110 has been observed with BeppoSAX between 0.5 and 150 keV. The high energy instrument onboard, PDS, has succeeded in measuring for the first time the spectrum of this...
The mass density in black holes inferred from the X-ray background (1999)
The X-ray Background (XRB) probably originates from the integrated X-ray emission of active galactic nuclei (AGN). Modelling of its flat spectrum implies considerable absorption in most AGN. Compton...
Ebeling, H., Edge, A. C., Böhringer, H., Allen, S. W., Crawford, C. S., Fabian, A. C., ...
We present a 90 per cent flux-complete sample of the 201 X-ray brightest clusters of galaxies in the northern hemisphere (dec > 0 deg), at high Galactic latitudes (|b| > 20 deg), with measured...
A Simultaneous ASCA and RXTE Long Look at the Seyfert 1 Galaxy MCG--6-30-15 (1998)
Lee, J. C., Fabian, A. C., Iwasawa, K., Brandt, W. N., Reynolds, C. S.
We report on a joint RXTE and ASCA observation spanning $\sim$ 400~ks of the Seyfert 1 galaxy MCG--6-30-15. The low energy coverage of ASCA coupled with the high energy coverage of RXTE have allowed...
On the Origin of the Hard X-Ray Background (1998)
Di Matteo, T., Esin, A., Fabian, A. C., Narayan, R.
Several models for the hard X-ray Background (XRB) suggest that it is due to the emission from heavily obscured AGN. Recent studies have revealed the presence of a new population of hard X-ray...
An RXTE study of M87 and the core of the Virgo cluster (1998)
Reynolds, C. S., Heinz, S., Fabian, A. C., Begelman, M. C.
We present hard X-ray observations of the nearby radio galaxy M87 and the core of the Virgo cluster using the Rossi X-ray Timing Explorer. These are the first hard X-ray observations of M87 not...
Matt, G., Guainazzi, M., Maiolino, R., Molendi, S., Perola, G. C., Antonelli, L. A., ...
The Circinus Galaxy has been observed, for the first time above 10 keV, by BeppoSAX. An excess emission above the extrapolation of the best fit 0.1--10 keV spectrum is apparent in the PDS data. The...
Wu, K. K. S., Fabian, A. C., Nulsen, P. E. J.
Models of galaxy formation should be able to predict the properties of clusters of galaxies, in particular their gas fractions, metallicities, X-ray luminosity-temperature relation, temperature...
Limits on the X-ray emission from several hyperluminous IRAS galaxies (1998)
Wilman, R. J., Fabian, A. C., Cutri, R. M., Crawford, C. S., Brandt, W. N.
We report long, pointed ROSAT HRI observations of the hyperluminous galaxies IRAS F00235+1024, F12514+1027, F14481+4454 and F14537+1950. Two of them are optically classified as Seyfert-like. No X-ray...
Young, A. J., Ross, R. R., Fabian, A. C.
Reynolds & Begelman (1997) have recently proposed a model in which the broad and extremely redshifted iron line seen during a deep minimum of the light curve of the Seyfert 1 galaxy MCG-6-30-15...
Heavy and Complex X-ray Absorption Towards the Nucleus of Markarian 6 (1998)
Feldmeier, John, Brandt, W. N., Elvis, M., Fabian, A. C., Iwasawa, K., Mathur, S.
We have used the ASCA satellite to make the first X-ray spectra of Markarian 6, a bright Seyfert 1.5 galaxy with complex and variable permitted lines, an ionization cone, and remarkable radio...
Di Matteo, T., Fabian, A. C., Rees, M. J., Carilli, C. L., Ivison, R. J.
The growing evidence for supermassive black holes in the centres of nearby galaxies has brought into sharper focus the question of why elliptical galaxies, rich in hot gas, do not possess quasar-like...
Abraham, R. G., Ellis, R. S., Fabian, A. C., Tanvir, N. R., Glazebrook, K.
We analyse the spatially resolved colours of distant galaxies of known redshift in the Hubble Deep Field, using a new technique based on matching resolved four-band internal colour data to the...
ROSAT PSPC observations of the outer regions of the Perseus cluster of galaxies (1998)
Ettori, S., Fabian, A. C., White, D. A.
We present an analysis of four off-axis ROSAT PSPC observations of the Perseus cluster of galaxies (Abell~426). We detect the surface brightness profile to a radius of 80 arcmin ($\sim 2.4...
X-ray iron line reverberation from black hole accretion disks (1998)
Reynolds, C. S., Young, A. J., Begelman, M. C., Fabian, A. C.
The relativistically broad X-ray iron line seen in many AGN spectra is thought to originate from the central regions of the putative black hole accretion disk. Both the line profile and strength will...
Di Matteo, T., Celotti, A., Fabian, A. C.
We present a model for the different X-ray spectral states displayed by Galactic Black Hole Candidates (GBHC). We discuss the physical and spectral implications for a magnetically structured corona...
Lee, J. C., Fabian, A. C., Reynolds, C. S., Iwasawa, K., Brandt, W. N.
We report on a 50 ks observation of the bright Seyfert 1 galaxy MCG--6-30-15 with the Rossi X-ray Timing Explorer. The data clearly show the broad fluorescent iron line (equivalent width ~ 250 eV),...
Peres, C. B., Fabian, A. C., Edge, A. C., Allen, S. W., Johnstone, R. M., White, D. A.
This is the first part of a study of the detailed X-ray properties of the cores of nearby clusters. We have used the flux-limited sample of 55 clusters of Edge et al. (1990) and archival and...
Clustering of X-ray selected Active Galactic Nuclei (1998)
Carrera, F. J., Barcons, X., Fabian, A. C., Hasinger, G., Mason, K. O., McMahon, R. G., ...
A total of 235 Active Galactic Nuclei (AGN) from two different soft X-ray surveys (the ROSAT Deep Survey -DRS- and the ROSAT International X-ray Optical Survey -RIXOS-) with redshifts between 0 and...
X-Ray Emission Line Ratios and Multiphase Gas in Elliptical Galaxies and Galaxy Clusters (1998)
Buote, David A., Canizares, Claude R., Fabian, A. C.
We examine the K shell emission lines produced by isothermal and simple multiphase models of the hot gas in elliptical galaxies and galaxy clusters to determine the most effective means for...
Do nuclear starbursts obscure the X-ray background? (1998)
Fabian, A. C., Barcons, X., Almaini, O., Iwasawa, K.
We propose a model for the source of the X-ray background (XRB) in which low luminosity active nuclei (L
The changing X-ray period of the Seyfert galaxy IRAS18325-5926 (1998)
Fabian, A. C., Lee, J. C., Brandt, W. N., Iwasawa, K., Jahoda, K., Reynolds, C. S.
We report on two observations of the Seyfert galaxy IRAS18325-5926 made in 1997 December and 1998 February with the Rossi X-ray Timing Explorer (RXTE). We find evidence for periodicities in the...
The impact of cooling flows on the Tx-Lbol relation for the most luminous clusters (1998)
We examine the effects of cooling flows on the T_X-L_Bol relation for a sample of the most X-ray luminous (L_Bol > 10^45 erg/s) clusters of galaxies known. Using high-quality ASCA X-ray spectra and...
We explore the relationship between the metallicity of the intracluster gas in clusters of galaxies, determined by X-ray spectroscopy, and the presence of cooling flows. Using ASCA spectra and ROSAT...
The ASCA spectrum of the z=4.72 blazar, GB 1428+4217 (1998)
Fabian, A. C., Iwasawa, K., Celotti, A., Brandt, W. N., McMahon, R. G., Hook, I. M.
The X-ray luminous quasar GB 1428+4217 at redshift 4.72 has been observed with ASCA. The observed 0.5-10 keV flux is 3.2E-12 erg/s/cm2. We report here on the intrinsic 4-57 keV X-ray spectrum, which...
Detection of an X-ray periodicity in the Seyfert galaxy IRAS18325-5926 (1998)
Iwasawa, K., Fabian, A. C., Brandt, W. N., Kunieda, H., Misaki, K., Reynolds, C. S., ...
We report the detection of a 58 ks (16 hr) periodicity in the 0.5-10 keV X-ray light curve of the Seyfert galaxy IRAS18325-5926 (Fairall49), obtained from a 5-day ASCA observation. Nearly 9 cycles of...
Franceschini, A., Vercellone, S., Fabian, A. C.
Using recently published estimates - based on high spatial resolution spectroscopy - of the mass M_{BH} of nuclear black holes for a sample of nearby galaxies, we explore the dependence of galaxy...
The obscured BLR in the radio galaxy 3C 234. (1998)
Young, S., Axon, D.J., Hough, J., Fabian, A.C., Ward, M.J.
Original article can be found at: www3.interscience.wiley.com Copyright Blackwell Publishing / Royal Astronomical Society. DOI: 10.1046/j.1365-8711.1998.01243.x [Full text of this article is not...
Deep hard X-ray source counts from a fluctuation analysis of ASCA SIS images (1997)
Gendreau, K. C., Barcons, X., Fabian, A. C.
An analysis of the spatial fluctuations in 15 deep ASCA SIS0 images has been conducted in order to probe the 2-10 keV X-ray source counts down to a flux limit 2E-14 erg/cm2/s. Special care has been...
A new X-ray mission to measure the power spectrum of fluctuations in the Universe (1997)
We propose a new, simple, dedicated X-ray mission to measure the power spectrum of density fluctuations in the Universe, by accurately mapping the X-ray background on the whole sky on scales of...
Coulomb interactions in the intracluster medium (1997)
In this paper we discuss the effect of Coulomb collisions on the temperature profiles of the intracluster medium in clusters of galaxies, motivated by recent reports of negative temperature gradients...
ROSAT HRI observations of the Local Group galaxies IC 10, NGC 147 and NGC 185 (1997)
Brandt, W. N., Ward, M. J., Fabian, A. C., Hodge, P. W.
We report on pointed X-ray observations of IC 10, NGC 147 and NGC 185 made with the ROSAT High Resolution Imager (HRI). These are three Local Group galaxies that have never been previously studied in...
AXJ1749+684: a narrow emission-line galaxy with a flat X-ray spectrum (1997)
Iwasawa, K., Fabian, A. C., Brandt, W. N., Crawford, C. S., Almaini, O.
We report the serendipitous detection of an X-ray source, AXJ1749+684, with the ASCA Gas Imaging Spectrometer. AXJ1749+684 is identified with a LINER/starburst-type spiral galaxy KUG 1750+683A at a...
X-ray absorption in the strong FeII narrow-line Seyfert 1 galaxy Mrk 507 (1997)
Iwasawa, K., Brandt, W. N., Fabian, A. C.
We present results from spectral analysis of ASCA data on the NLS1 Mrk 507. This galaxy was found to have an exceptionally flat ROSAT spectrum among the NLS1s. The ASCA spectrum however shows a clear...
A multi-wavelength study of the Seyfert 1 galaxy MCG-6-30-15 (1997)
Reynolds, C. S., Ward, M. J., Fabian, A. C., Celotti, A.
We present a multiwaveband spectroscopic study of the nearby Seyfert 1 galaxy MCG-6-30-15. New optical spectra from the Anglo-Australian Telescope are presented which clearly show the effects of dust...
Cyclo-synchrotron emission from magnetically dominated active regions above accretion discs (1997)
Di Matteo, T., Celotti, A., Fabian, A. C.
We discuss the role of thermal cyclo-synchrotron emission in a magnetically dominated corona above an accretion disk in an active galaxy or a galactic black hole candidate. The dissipation occurs in...
Limits from rapid TeV variability of Mrk 421 (1997)
Celotti, A., Fabian, A. C., Rees, M. J.
The extreme variability event in the TeV emission of Mrk 421, recently reported by the Whipple team, imposes the tightest limits on the typical size of the TeV emitting regions in Active Galactic...
Fluctuations in the diffuse X-ray background observed with Ginga (1997)
Butcher, J. A., Stewart, G. C., Warwick, R. S., Fabian, A. C., Carrera, F. J., Barcons, X., ...
We present Ginga measurements of the spatial fluctuations in the diffuse X-ray background. When combined with earlier results, the new data constrain the extragalactic log N - log S relation in the...
Buote, David A., Fabian, A. C.
We present spectral analysis of ASCA data of 17 elliptical and 3 lenticular galaxies most of which have high L_x/L_B. Single-temperature models (MEKAL and Raymond-Smith) give unacceptable fits...
Reynolds, C. S., Fabian, A. C.
The broad iron K$\alpha$ emission line, commonly seen in the X-ray spectrum of Seyfert nuclei, is thought to originate when the inner accretion disk is illuminated by an active disk-corona. We show...
Hard X--ray detection of NGC 1068 with BeppoSAX (1997)
Matt, G., Guainazzi, M., Frontera, F., Bassani, L., Brandt, W. N., Fabian, A. C., ...
We report on the first detection above ~10 keV of the archetypal Compton-thick Seyfert 2 galaxy NGC 1068. This detection, obtained with the PDS instrument onboard BeppoSAX in the 20-100 keV range,...
Barcons, X., Fabian, A. C., Carrera, F. J.
The precision of intensity measurements of the extragalactic X-ray Background (XRB) on an angular scale of about a degree is dominated by spatial fluctuations caused by source confusion noise. X-ray...
Two-temperature coronae in active galactic nuclei (1997)
Di Matteo, T., Blackman, E. G., Fabian, A. C.
We show that coronal magnetic dissipation in thin active sheets that sandwich standard thin accretion disks in active galactic nuclei may account for canonical electron temperatures of a few $\times...
Dabrowski, Y., Fabian, A. C., Iwasawa, K., Lasenby, A. N., Reynolds, C. S.
Recent X-ray observations have shown broad, skewed iron line emission from Seyfert 1 galaxies which is explained by the emission being fluorescence on a disk close to a black hole. During one...
AGN predictions for the Hubble Deep Field and the X-ray background (1997)
We estimate the number of AGN among the galaxies in the Hubble Deep Field (HDF). The recent discovery of a class of X-ray luminous narrow emission-line galaxies has provided a possible explanation...
On the mass distribution in the Shapley Supercluster inferred from X-ray observations (1997)
Ettori, S., Fabian, A. C., White, D. A.
We present an analysis of a mosaic of ROSAT PSPC and Einstein Observatory IPC X-ray observations of 14 clusters and 2 groups of galaxies, enclosed in a sky area 15 degrees by 20 degrees centred on...
The iron K line complex in NGC1068: implications for X-ray reflection in the nucleus (1997)
Iwasawa, K., Fabian, A. C., Matt, G.
We report a new analysis of ASCA data on the iron K line complex in NGC1068. The line complex basically consists of three components, as previously reported. A weak red wing of the 6.4 keV...
Boller, Th., Brandt, W. N., Fabian, A. C., Fink, H. H.
We report evidence for persistent giant and rapid X-ray variability in the radio-quiet, ultrasoft, strong Fe II, narrow-line Seyfert 1 galaxy IRAS 13224-3809. Within a 30 day ROSAT High Resolution...
It has been suggested that the final stages of accretion in present--day giant elliptical galaxies occur in an advection-dominated mode. The poor radiative efficiency of this accretion solution...
The ROSAT Brightest Cluster Sample (BCS): The cluster X-ray luminosity function within z=0.3 (1997)
Ebeling, H., Edge, A. C., Fabian, A. C., Allen, S. W., Crawford, C. S., Boehringer, H.
We present and discuss the X-ray luminosity function (XLF) of the ROSAT Brightest Cluster sample (BCS), an X-ray flux limited sample of clusters of galaxies in the northern hemisphere compiled from...
The ASCA X-ray spectrum of the powerful radio galaxy 3C109 (1997)
Allen, S. W., Fabian, A. C., Idesawa, E., Inoue, H., Kii, T., Otani, C.
We report the results from an ASCA X-ray observation of the powerful Broad Line Radio Galaxy, 3C109. The ASCA spectra confirm our earlier ROSAT detection of intrinsic X-ray absorption associated with...
We present the results from a study of the spatial distributions of cooling gas and intrinsic X-ray absorbing material in a sample of nearby, X-ray bright cooling flow clusters observed with the...
ASCA observations of the nearby galaxies Dwingeloo 1 and Maffei 1 (1996)
Reynolds, C. S., Loan, A. J., Fabian, A. C., Makishima, K., Brandt, W. N., Mizuno, T.
We present ASCA observations of the nearby galaxies Dwingeloo 1 (Dw1) and Maffei 1 (Mf1). X-ray sources are clearly detected within 3 arcminutes of the optical nuclei of both galaxies. Despite the...
Soft X-ray background fluctuations and large-scale structure in the Universe (1996)
Carrera, F. J., Fabian, A. C., Barcons, X.
We have studied the fluctuations of the soft (0.9-2 keV) X-ray background intensity for ~10 arcmin and ~2 arcmin beam sizes, using 80 high galactic latitude medium-deep images from the ROSAT position...
The `quiescent' black hole in M87 (1996)
Reynolds, C. S., Di Matteo, T., Fabian, A. C., Hwang, U., Canizares, C. R.
It is believed that most giant elliptical galaxies possess nuclear black holes with masses in excess of $10^8\Msun$. Bondi accretion from the interstellar medium might then be expected to produce...
ASCA and ROSAT observations of distant massive cooling flows (1996)
Allen, S. W., Fabian, A. C., Edge, A. C., Bautz, M. W., Furuzawa, A., Tawara, Y.
We present the results from a detailed ASCA/ROSAT X-ray study of three distant, massive cooling flows; Zwicky 3146 (z=0.291), Abell 1835 (z=0.252) and E1455+223 (Zwicky 7160; z=0.258). Using...
Iwasawa, K., Fabian, A. C., Ueno, S., Awaki, H., Fukazawa, Y., Matsushita, K., ...
We present results on the Seyfert 2 galaxy NGC4388 in the Virgo cluster observed with ASCA during its PV phase. The 0.5-10 keV X-ray spectrum consists of multiple components; (1) a continuum...
Brandt, W. N., Fabian, A. C., Dotani, T., Nagase, F., Inoue, H., Kotani, T., ...
We report on ASCA energy spectra of Cir X-1 taken near its zero phase on 1994 August 4-5. The ASCA SIS detectors allow a more detailed study of the iron K complex than has been possible before. We...
The variable iron K emission line in MCG-6-30-15 (1996)
Iwasawa, K., Fabian, A. C., Reynolds, C. S., Nandra, K., Otani, C., Inoue, H., ...
We report on the variability of the iron K emission line in the Seyfert 1 galaxy MCG--6-30-15 during a four-day ASCA observation. The line consists of a narrow core at an energy of about 6.4 keV, and...
Ion-supported tori: a thermal bremsstrahlung model for the X-ray Background (1996)
We discuss the possibility that a significant contribution of the hard X-ray Background is the integrated emission from a population of galaxies undergoing advection-dominated accretion in their...
The matter content of the jet in M87: evidence for an electron-positron jet (1996)
Reynolds, C. S., Fabian, A. C., Celotti, A., Rees, M. J.
Recent observations have allowed the geometry and kinematics of the M87 jet to be tightly constrained. We combine these constraints with historical Very Long Baseline Interferometry (VLBI) results...
X-ray evolution in the ROSAT Brightest Cluster Sample (1995)
Ebeling, H., Allen, S. W., Crawford, C. S., Edge, A. C., Fabian, A. C., Böhringer, H., ...
We present the X-ray luminosity function (XLF) of the ROSAT Brightest Cluster Sample (BCS), an X-ray selected, flux limited sample of 172 clusters of galaxies at $z\leq 0.3$ compiled from ROSAT...
ASCA and ROSAT observations of the QSF3 field: the X-ray background in the 0.1--7 keV band (1995)
Fabian, A. C., Gendreau, K. C.
The X-ray background (XRB) from 0.1 to 7 keV has been studied using high spectral and spatial resolution data from the ASCA SIS and ROSAT PSPC. Analysing both the diffuse background radiation and...
The variable OVIII Warm Absorber in MCG-6-30-15 (1995)
Otani, C., Kii, T., Reynolds, C. S., Fabian, A. C., Iwasawa, K., Hayashida, K., ...
We present the results of a 4 day ASCA observation of the Seyfert galaxy MCG-6-30-15, focussing on the nature of the X-ray absorption by the warm absorber, characterizd by the K-edges of the...
The spectra of accretion discs in low-mass X-ray binaries (1995)
We present self-consistent models for the radiative transfer in Shakura-Sunyaev accretion discs in bright low-mass X-ray binaries (LMXB). Our calculations include the full effects of incoherent...
X-ray detection of SN1988Z with the ROSAT HRI (1995)
We report the detection of SN1988Z in X-rays with the ROSAT High Resolution Imager. The inferred X-ray luminosity of about $10^{41}\ergps$ can be well explained by assuming that the supernova...
Ross, R. R., Fabian, A. C., Brandt, W. N.
We consider the spectra of Thomson-thick, geometrically-thin accretion discs around Galactic black hole candidates in the reflection model and compute their iron K edges and iron K$\alpha$ lines. We...
ROSAT PSPC observations of Cygnus-A : X-ray spectra of the cooling flow and hot spots (1995)
Reynolds, C. S., Fabian, A. C.
We present a {\it ROSAT} Position Sensitive Proportional Counter (PSPC) observation of the powerful radio galaxy Cygnus-A. The X-ray emission in the {\it ROSAT} band is dominated by thermal emission...
The accretion luminsoity of a massive black hole in an elliptical galaxy (1995)
Most large elliptical galaxies should now host a massive black hole leftover from an earlier quasar phase. Such galaxies also have an extensive hot gaseous halo. Here we consider why the nuclei of...
Brandt, W. N., Fabian, A. C., Pounds, K. A.
We present spatial, temporal and spectral analyses of ROSAT Position Sensitive Proportional Counter (PSPC) observations of the infrared loud quasar IRAS 13349+2438. IRAS 13349+2438 is the archetypal...
On broad iron K-alpha lines in Seyfert 1 galaxies (1995)
Fabian, A. C., Nandra, K., Reynolds, C. S., Brandt, W. N., Otani, C., Tanaka, Y., ...
The X-ray spectrum obtained by Tanaka et al from a long observation of the active galaxy MCG$-6-30-15$ shows a broad iron K$\alpha$ line skewed to low energies. The simplest interpretation of the...
Reynolds, C. S., Fabian, A. C., Nandra, K., Inoue, H., Kunieda, H., Iwasawa, K.
We present a detailed re-analysis of the two {\it ASCA} Performance Verification observations of the nearby Seyfert 1 galaxy MCG-6-30-15. Confirming the results of Fabian et al. (1994), we find...
Allen, S. W., Fabian, A. C., Kneib, J. P.
We present spatially-resolved X-ray spectroscopy of the X-ray luminous cluster of galaxies, PKS0745-191, using observations made with the ASCA and ROSAT satellites. The X-ray data measure the...
The role of cooling flows in galaxy formation (1995)
Nulsen, P. E. J., Fabian, A. C.
The present structure of galaxies is governed by the radiative dissipation of the gravitational and supernova energy injected during formation. A crucial aspect of this process is whether the gas...
ROSAT HRI observations of IRAS P09104+4109: a massive cooling flow (1995)
Fabian, A. C., Crawford, C. S.
A ROSAT HRI image of the hyperluminous infrared galaxy IRAS P09104+4109 shows extended X-ray emission peaked around the central galaxy in a profile characteristic of a cooling flow. The inferred soft...
ASCA observations of the Seyfert 1 galaxies Mrk1040 and MS0225.5+3121 (1995)
Reynolds, C. S., Fabian, A. C., Inoue, H.
We present {\it ASCA} observations of the Seyfert 1 galaxies Mrk~1040 and MS~0225.5+3121. Mrk~1040 was found to have decreased in flux by almost a factor of 4 since an {\it EXOSAT} observation...
Cooling flows, central galaxy--cluster alignments, X-ray absorption and dust (1995)
Allen, S. W., Fabian, A. C., Edge, A. C., Bohringer, H., White, D. A.
We present the analysis of pointed ROSAT PSPC observations of five of the most luminous, intermediate redshift ($0.1 < z < 0.15$) clusters of galaxies detected in the ROSAT All-Sky Survey. The PSPC...
Einstein Observatory evidence for the widespread baryon overdensity in clusters of galaxies, (1995)
We analyse the X-ray surface brightness profiles of 19 moderately distant and luminous clusters of galaxies observed with the \EINOBS. Our aim is to determine cluster gas masses out to radii between...
Warm absorbers in active galactic nuclei (1995)
Reynolds, C. S., Fabian, A. C.
Recent {\it ASCA} observations confirm the presence of X-ray absorption due to partially ionized gas in many Seyfert 1 galaxies; the so-called warm absorber. Constraints on the location of the warm...
Detection of broad iron K lines in active galaxies (1995)
Mushotzky, R F, Fabian, A C, Iwasawa, K, Kunieda, H, Matsuoka, M, Nandra, K, ...
Nearby Galaxies and the Ginga X-ray Background (1994)
Carrera, F. J., Barcons, X., Butcher, J. A., Fabian, A. C., Lahav, O., Stewart, G. C., ...
We present here the results of cross-correlating the X-ray background measured by Ginga in the 2-10 keV band with several catalogues of extragalactic objects. Positive signals with an amplitude of a...
Brandt, W. N., Fabian, A. C., Nandra, K., Reynolds, C. S., Brinkmann, W.
We present spatial, temporal and spectral analyses of ROSAT Position Sensitive Proportional Counter (PSPC) observations of the Seyfert 1 galaxies Ark 564, NGC 985, Kaz 163, Mrk 79 and RX...