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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
We present a new technique for choosing spatial regions for X-ray spectroscopy, called "contour binning". The method chooses regions by following contours on a smoothed image of the object. In...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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 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...
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...
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...
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...
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...
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...
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...
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...
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...