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A variable near-infrared counterpart to the neutron-star low-mass X-ray binary 4U 1705-440
Jeroen Homan, David L. Kaplan, Maureen van den Berg +1
We report the discovery of a near-infrared (nIR) counterpart to the persistent neutron-star low-mass X-ray binary 4U 1705-440, at a location consistent with its recently determined…
Probing the accretion disk and central engine structure of NGC4258 with Suzaku and XMM-Newton observations
Christopher S. Reynolds, Michael A. Nowak, Sera Markoff +3
[abridged] We present an X-ray study of the low-luminosity active galactic nucleus (AGN) in NGC4258 using data from Suzaku, XMM-Newton, and the Swift/BAT survey. We find that signa…
X-ray observations of the galaxy cluster PKS 0745-191: To the virial radius, and beyond
Matthew R. George, Andrew C. Fabian, Jeremy S. Sanders +2
We measure X-ray emission from the outskirts of the cluster of galaxies PKS 0745-191 with Suzaku, determining radial profiles of density, temperature, entropy, gas fraction, and ma…
Results from an extensive simultaneous broadband campaign on the underluminous active nucleus M81*: further evidence for mass-scaling accretion in black holes
S. Markoff, M. Nowak, A. Young +13
We present the results of a broadband simultaneous campaign on the nearby low-luminosity active galactic nucleus M81*. From February through August 2005, we observed M81* five time…
XMM-Newton Detection of a Compton-thick AGN in the 1-Jy ULIRG/LINER F04103-2838
Stacy H. Teng, S. Veilleux, A. S. Wilson +3
We report on the detection of Fe Kalpha emission in F041032838, an ultraluminous infrared galaxy (ULIRG; log[L/L] 12) that is optically classified as a…
A Chandra X-Ray Survey of Ultraluminous Infrared Galaxies
Stacy H. Teng, A. S. Wilson, S. Veilleux +3
We present results from Chandra observations of 14 ultraluminous infrared galaxies (ULIRGs; log(L_IR/L_Sun) >= 12) with redshifts between 0.04 and 0.16. The goals of the observatio…
A Chandra HETGS Spectral Study of the Iron K Bandpass in MCG-6-30-15: A Narrow View of the Broad Iron Line
A. J. Young, J. C. Lee, A. C. Fabian +3
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…
Canonical Particle Acceleration in FRI Radio Galaxies
Andrew Young, Lawrence Rudnick, Debora Katz +3
Matched resolution multi-frequency VLA observations of four radio galaxies are used to derive the asymptotic low energy slope of the relativistic electron distribution. Where avail…
The Halo, Hot Spots and Jet/Cloud Interaction of PKS 2153--69
A. J. Young, A. S. Wilson, S. J. Tingay +1
We report Chandra X-ray Observatory and 1.4 GHz Australian Long Baseline Array (LBA) observations of the radio galaxy PKS 2153--69 and its environment. The Chandra image reveals a…
X-ray Reflection from Inhomogeneous Accretion Disks: II. Emission Line Variability and Implications for Reverberation Mapping
D. R. Ballantyne, N. J. Turner, A. J. Young
One of the principal scientific objectives of the upcoming Constellation-X mission is to attempt to map the inner regions of accretion disks around black holes in Seyfert galaxies…
Chandra X-ray Observations of NGC 4258: Iron Absorption Lines from the Nucleus
A. J. Young, A. S. Wilson
We report sub-arcsecond resolution X-ray imaging spectroscopy of the low luminosity active galactic nucleus of NGC 4258 and its immediate surroundings with the Chandra X-ray Observ…
The hard X-ray spectrum of the Seyfert galaxy IRAS 18325-5926: cool corona, reflection from an ionized disk and variable iron K emission
K. Iwasawa, J. C. Lee, A. J. Young +2
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 fro…
The X-ray nebula around the Seyfert 2 galaxy NGC4388
K. Iwasawa, A. S. Wilson, A. C. Fabian +1
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 suggeste…
On the influence of radio galaxies on cooling flows: M87 and Cygnus A
Andrew S. Wilson, Andrew J. Young, David A. Smith
Results from Chandra studies of the intracluster medium around M87 and Cygnus A are summarized.
A long hard look at MCG-6-30-15 with XMM-Newton
A. C. Fabian, S. Vaughan, K. Nandra +6
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…
Cygnus A
A. S. Wilson, K. A. Arnaud, D. A. Smith +2
We report Chandra imaging-spectroscopy and RXTE spectroscopy of the nearby, powerful radio galaxy Cygnus A. Various aspects of the results are discussed, including the X-ray proper…
Chandra Imaging of the X-ray Core of the Virgo Cluster
A. J. Young, A. S. Wilson, C. G. Mundell
We report sub-arcsecond X-ray imaging spectroscopy of M87 and the core of the Virgo cluster with the Chandra X-ray Observatory. The X-ray morphology shows structure on arcsecond (~…
Accretion onto the Supermassive Black Hole in M87
Tiziana Di Matteo, Steven W. Allen, Andrew C. Fabian +2
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 10^9 Msun…
A Chandra X-ray Study of Cygnus A - II. The Nucleus
Andrew J. Young, Andrew S. Wilson, Yuichi Terashima +2
We report Chandra ACIS and quasi-simultaneous RXTE observations of the nearby, powerful radio galaxy Cygnus A, with the present paper focusing on the properties of the active nucle…
A Chandra X-ray Study of Cygnus A - III. The Cluster of Galaxies
David A. Smith, Andrew S. Wilson, Keith A. Arnaud +2
The results from a recent Chandra ACIS-S study of the cluster surrounding Cygnus A are presented. We have deprojected the X-ray spectra taken from various elliptical shells in orde…
BeppoSAX spectroscopy of MR 2251-178: a test for ionized reflection in radio quiet QSOs
A. Orr, P. Barr, M. Guainazzi +3
We present the 0.1-200 keV BeppoSAX spectrum of MR 2251-178 observed at two epochs in 1998 separated by 5 months. Both epochs show identical spectral shape and X-ray flux. Analysis…
A Chandra X-ray Study of NGC 1068 - I. Observations of Extended Emission
A. J. Young, A. S. Wilson, P. L. Shopbell
We report sub arc-second resolution X-ray imaging-spectroscopy of the archetypal type 2 Seyfert galaxy NGC 1068 with the Chandra X-ray Observatory. The observations reveal the deta…
A Complete Relativistic Ionized Accretion Disc in Cygnus X-1
A. J. Young, A. C. Fabian, R. R. Ross +1
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…
Chandra X-ray Observations of Cygnus A and Pictor A
A. S. Wilson, A. J. Young, P. L. Shopbell
We describe observations of the two nearest, powerful radio galaxies with the Chandra X-ray Observatory: Cygnus A (z = 0.0562) and Pictor A (z = 0.035). Since the early results fro…