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Hard X-ray Lags in Active Galactic Nuclei: Testing the Distant Reverberation Hypothesis with NGC 6814
D. J. Walton, A. Zoghbi, E. M. Cackett +7
We present an X-ray spectral and temporal analysis of the variable active galaxy NGC 6814, observed with Suzaku during November 2011. Remarkably, the X-ray spectrum shows no eviden…
SWIFT J1910.2-0546: A possible black hole binary with a retrograde spin or truncated disk
R. C. Reis, M. T. Reynolds, J. M. Miller +4
We present the first results from a long (51 ks) XMM-Newton observation of the Galactic X-ray binary Swift J1910.2-0546 in a intermediate state, obtained during its 2012 outburst.…
Revisiting Putative Cool Accretion Disks in Ultraluminous X-ray Sources
J. M. Miller, D. J. Walton, A. L. King +4
Soft, potentially thermal spectral components observed in some ULXs can be fit with models for emission from cool, optically-thick accretion disks. If that description is correct,…
X-ray Outflows and Super-Eddington Accretion in the Ultraluminous X-ray Source Holmberg IX X-1
D. J. Walton, J. M. Miller, F. A. Harrison +4
Studies of X-ray continuum emission and flux variability have not conclusively revealed the nature of ultra-luminous X-ray sources (ULXs) at the high-luminosity end of the distribu…
Results of the Swift Monitoring Campaign of the X-ray Binary 4U 1957+11: Constraints on Binary Parameters
Dipankar Maitra, Jon M. Miller, Mark T. Reynolds +2
We present new results of uniform spectral analysis of Swift/XRT observations of the X-ray binary system 4U 1957+11. This includes 26 observations of the source made between MJD 54…
On the size and location of the X-ray emitting coronae around black holes
R. C. Reis, J. M. Miller
The observation of energetic X-ray emission from black holes, inconsistent with thermal emission from an accretion disk, has long indicated the presence of a "corona" around these…