On the X-ray properties of submm-selected galaxies (2009)
Laird, Elise S., Nandra, Kirpal, Pope, Alexandra, Scott, Douglas
We present an analysis of the X-ray properties of 35 submm galaxies(SMGs) in the CDF-N. Using a sample of robust 850micron-selected galaxies, with accurate positions from Spitzer and/or radio...
AGN dust tori: the X-ray-infrared connection (2009)
Rowan-Robinson, Michael, Valtchanov, Ivan, Nandra, Kirpal
We have combined the CLASXS Chandra survey in Lockman with the Spitzer SWIRE survey data to study the X-ray-infrared connection for AGN. The sample consists of 401 X-ray-sources, of which 306 are...
Bell, Eric, Davis, Marc, Dey, Arjun, Van Dokkum, Pieter, Ellis, Richard, Eisenstein, Daniel, ...
Over the last decade optical spectroscopic surveys have characterized the low redshift galaxy population and uncovered populations of star-forming galaxies back to z ~ 7. This work has shown that the...
XEUS: the physics of the hot evolving universe (2009)
Arnaud, Monique, Barcons, Xavier, Barret, Didier, Bautz, Marshall, Bellazzini, Ronaldo, Bleeker, Johan, ...
AEGIS: the clustering of x-ray active galactic nucleus relative to galaxies at z similar to 1 (2009)
Coil, Alison L., Georgakakis, Antonis, Newman, Jeffrey A., Cooper, Michael C., Croton, Darren, Davis, Marc, ...
We measure the clustering of nonquasar X-ray active galactic nucleus (AGN) at z = 0.7–1.4 in the AEGIS field. Using the cross-correlation of 113 Chandra-selected AGN, with a median log LX =...
Montero-Dorta, Antonio D., Croton, Darren J., Yan, Renbin, Cooper, Michael C., Newman, Jeffrey A., Georgakakis, Antonis, ...
We measure the dependence of the active galactic nuclei (AGN) fraction on local environment at z∼ 1, using spectroscopic data taken from the DEEP2 Galaxy Redshift Survey, and Chandra X-ray data...
On the nature of unabsorbed Seyfert 2 galaxies (2008)
Brightman, Murray, Nandra, Kirpal
We present an analysis of six 12 um selected Seyfert 2 galaxies that have been reported to be unabsorbed in the X-ray. By comparing the luminosities of these galaxies in the mid-IR (12um), optical...
AEGIS: new evidence linking active galactic nuclei to the quenching of star formation (2008)
Bundy, Kevin, Georgakakis, Antonis, Nandra, Kirpal, Ellis, Richard S., Conselice, Christopher J., Laird, Elise, ...
Using Chandra X-ray observations in the All-Wavelength Extended Groth Strip International Survey (AEGIS) we identify 241 X-ray-selected active galactic nuclei (AGNs; L2–10 > 10^42 ergs s^−1) and...
The X-ray luminosity function of AGN at z~3 (2008)
Aird, James, Nandra, Kirpal, Georgakakis, Antonis, Laird, Elise S., Steidel, Charles C., Sharon, Chelsea
We combine Lyman-break colour selection with ultradeep (> 200 ks) Chandra X-ray imaging over a survey area of ~0.35 deg^2 to select high redshift AGN. Applying careful corrections for both the...
Montero-Dorta, Antonio D., Croton, Darren J., Yan, Renbin, Cooper, Michael C., Newman, Jeffery A., Georgakakis, Antonis, ...
We measure the dependence of the AGN fraction on local environment at z~1, using spectroscopic data taken from the DEEP2 Galaxy Redshift Survey, and Chandra X-ray data from the All-Wavelength...
AEGIS: New Evidence Linking Active Galactic Nuclei to the Quenching of Star Formation (2007)
Bundy, Kevin, Georgakakis, Antonis, Nandra, Kirpal, Ellis, Richard S., Conselice, Christopher J., Laird, Elise, ...
Utilizing Chandra X-ray observations in the All-wavelength Extended Groth Strip International Survey (AEGIS) we identify 241 X-ray selected Active Galactic Nuclei (AGNs, L > 10^{42} ergs/s) and study...
On the relativistic iron line and soft excess in the Seyfert 1 galaxy Markarian 335 (2007)
O'Neill, Paul M., Nandra, Kirpal, Cappi, Massimo, Longinotti, Anna Lia, Sim, Stuart A.
We report on a 133 ks XMM-Newton observation of the Seyfert 1 galaxy Markarian 335. The 0.4-12 keV spectrum contains an underlying power law continuum, a soft excess below 2 keV, and a double-peaked...
Rosa-Gonzalez, Daniel, Burgarella, Denis, Nandra, Kirpal, Kunth, Daniel, Terlevich, Elena, Terlevich, Roberto
We have combined multi-wavelength observations of a selected sample of starforming galaxies with galaxy evolution models in order to compare the results obtained for different SFR tracers and to...
On the relativistic iron line and soft excess in the Seyfert 1 galaxy Markarian 335 (2007)
O'Neill, Paul M., Nandra, Kirpal, Cappi, Massimo, Longinotti, Anna Lia, Sim, Stuart A.
AEGIS: Chandra observation of DEEP2 galaxy groups and clusters (2007)
Fang, Taotao, Gerke, Brian F., Davis, David S., Newman, Jeffrey A., Davis, Marc, Nandra, Kirpal, ...
We present a 200 ks Chandra observation of seven spectroscopically selected, high-redshift (0.75 < z < 1.03) galaxy groups and clusters discovered by the DEEP2 Galaxy Redshift Survey in the...
The all-wavelength extended groth strip international survey (AEGIS) data sets (2007)
Davis, Michael A., Guhathakurta, Puragra, Konidaris, Nick P., Newman, Jeffrey A., Ashby, Matthew L. N., Biggs, Andrew D., ...
In this the first of a series of Letters, we present a panchromatic data set in the Extended Groth Strip region of the sky. Our survey, the All-Wavelength Extended Groth Strip International Survey...
AEGIS: the color-magnitude relation for X-ray-selected active galactic nuclei (2007)
Nandra, Kirpal, Georgakakis, Antonis, Willmer, Christopher N., Cooper, Michael C., Croton, D. J., Davis, Michael A., ...
We discuss the relationship between rest-frame color and optical luminosity for X-ray sources in the range 0.6 < z < 1.4 selected from the Chandra survey of the Extended Groth Strip. These...
AEGIS: the environment of X-ray sources at z almost equal to 1 (2007)
Georgakakis, Antonis, Nandra, Kirpal, Laird, Elise S., Cooper, Michael C., Gerke, Brian F., Newman, Jeffrey A., ...
We explore the environment of z ≈ 1 AGNs using a sample of 53 spectroscopically identified X-ray sources in the All-Wavelength Extended Groth Strip International Survey. We quantify the local...
The DEEP2 Galaxy Redshift Survey: AEGIS observations of a Dual AGN at z = 0.7 (2006)
Newman, Jeffrey A., Lotz, Jennifer, Yan, Renbin, Barmby, P., Coil, Alison L., ...
Evidence for relativistic features in the X-ray spectrum of Mrk 335 (2006)
Longinotti, Anna Lia, Sim, Stuart, Nandra, Kirpal, Cappi, Massimo
We present an analysis of hard X-ray features in the spectrum of the bright Sy 1 galaxy Mrk 335 observed by the XMM-Newton satellite. Our analysis confi rms the presence of a broad, ionised iron...
The DEEP2 Galaxy Redshift Survey: AEGIS Observations of a Dual AGN at z=0.7 (2006)
Gerke, Brian F., Newman, Jeffrey A., Lotz, Jennifer, Yan, Renbin, Barmby, P., Coil, Alison L., ...
We present evidence for a dual Active Galactic Nucleus (AGN) within an early-type galaxy at z=0.709 in the Extended Groth Strip. The galaxy lies on the red sequence, with absolute magnitude M_B=-21.0...
Desroches, Louis-Benoit, Filippenko, Alexei V., Kaspi, Shai, Laor, Ari, Maoz, Dan, Ganeshalingam, Mohan, ...
We present optical observations of the low-luminosity Seyfert 1 nucleus of NGC 4395, as part of a multiwavelength reverberation-mapping program. Observations were carried out over two nights in 2004...
O'Neill, Paul M., Kaspi, Shai, Laor, Ari, Nandra, Kirpal, Moran, Edward C., Peterson, Bradley M., ...
We report on two Chandra observations, and a simultaneous Hubble Space Telescope ultraviolet observation, of the dwarf Seyfert 1 galaxy NGC 4395. Each Chandra observation had a duration of ~30 ks,...
Rowan-Robinson, Michael, Babbedge, Tom, Surace, Jason, Shupe, Dave, Fang, Fan, Lonsdale, Carol, ...
We discuss optical associations, spectral energy distributions (SEDs), and photometric redshifts for Spitzer Wide-Area Infrared Extragalactic (SWIRE) Survey sources in the European Large-Area ISO...
Rowan-Robinson, Michael, Babbedge, Tom, Surace, Jason, Shupe, Dave, Fang, Fan, Lonsdale, Carol, ...
We discuss optical associations, spectral energy distributions (SEDs), and photometric redshifts for Spitzer Wide-Area Infrared Extragalactic (SWIRE) Survey sources in the European Large-Area ISO...
O'Neill, Paul M., Nandra, Kirpal, Papadakis, Iossif E., Turner, T. Jane
We have investigated the relationship between the 2-10 keV X-ray variability amplitude and black hole mass for a sample of 46 radio-quiet active galactic nuclei observed by ASCA. Thirty-three of the...
The Properties and the Evolution of the Highly Ionized Gas in MR2251-178 (2004)
Kaspi, Shai, Netzer, Hagai, Chelouche, Doron, George, Ian M., Nandra, Kirpal, Turner, T. J.
(abridged) We present the first XMM-Newton observations of the radio-quiet quasar MR2251-178 obtained in 2000 and 2002. The EPIC-pn spectra show a power-law continuum with a slope of 1.6 at high...
Timing Analysis of Light Curves in the Tartarus Active Galactic Nuclei Database (2004)
O'Neill, Paul M., Nandra, Kirpal, Papadakis, Iossif E., Turner, T. Jane
The Tartarus database contains products for 529 ASCA observations of active galactic nuclei. We have been updating Tartarus to include observing sequences conducted after 1999 January. The revised...
The Ionized Gas and Nuclear Environment in NGC 3783 II. Averaged HST/STIS and FUSE Spectra (2002)
Gabel, Jack R., Crenshaw, D. Michael, Kraemer, Steven B., Brandt, W. N., George, Ian M., Hamann, Frederick W., ...
We present observations of the intrinsic absorption in the Seyfert 1 galaxy NGC 3783 obtained with the STIS/HST and FUSE. We have coadded multiple STIS and FUSE observations to obtain a high S/N...
X-ray vs. Optical Variations in the Seyfert 1 Nucleus NGC 3516: A Puzzling Disconnectedness (2002)
Maoz, Dan, Markowitz, Alex, Edelson, Rick, Nandra, Kirpal
We present optical broadband (B and R) observations of the Seyfert 1 nucleus NGC 3516, obtained at Wise Observatory from March 1997 to March 2002, contemporaneously with X-ray 2-10 keV measurements...
Intensive HST, RXTE and ASCA Monitoring of NGC 3516: Evidence Against Thermal Reprocessing (1999)
Edelson, Rick, Koratkar, Anuradha, Nandra, Kirpal, Goad, Michael, Peterson, Bradley M., Collier, Stefan, ...
During 1998 April 13-16, NGC 3516 was monitored almost continuously with HST for 10.3 hr in the UV and 2.8 d in the optical, and simultaneous RXTE and ASCA monitoring covered the same period. The...
A Possible 100-day X-ray-to-Optical Lag in the Variations of the Seyfert 1 Nucleus NGC 3516 (1999)
Maoz, Dan, Edelson, Rick, Nandra, Kirpal
We present optical broadband (B and R) observations of the Seyfert 1 nucleus NGC 3516, obtained at Wise Observatory from 1997 March to 1998 September, contemporaneously with the X-ray 2-10 keV...
A Cutoff in the X-ray Fluctuation Power Density Spectrum of the Seyfert 1 Galaxy NGC 3516 (1998)
During 1997 March-July, XTE observed the bright, strongly variable Seyfert 1 galaxy NGC 3516 once every ~12.8 hr for 4.5 months and nearly continuously (with interruptions due to SAA passage but not...
Evidence for Relativistic Outflows in Narrow-line Seyfert 1 Galaxies (1997)
Leighly, Karen M., Mushotzky, Richard F., Nandra, Kirpal, Forster, Karl
We report the observation of features near 1 keV in the ASCA spectra from three ``Narrow Line Seyfert 1'' (NLS1) galaxies. We interpret these as oxygen absorption in a highly relativistic outflow. If...