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Disk Dominated States of 4U 1957+11: Chandra, XMM, and RXTE Observations of Ostensibly the Most Rapidly Spinning Galactic Black Hole
Michael A. Nowak, Adrienne Juett, Jeroen Homan +4
We present simultaneous Chandra-HETG and RXTE observations of a moderate flux `soft state' of the black hole candidate 4U1957+11. These spectra, having a minimally discernible hard…
Limits on Hot Galactic Halo Gas from X-ray Absorption Lines
Yangsen Yao, Michael A. Nowak, Q. Daniel Wang +2
Although the existence of large-scale hot gaseous halos around massive disk galaxies have been theorized for a long time, there is yet very little observational evidence. We report…
Confirming the Detection of an Intergalactic X-ray Absorber Toward PKS 2155-304
Taotao Fang, Claude R. Canizares, Yangsen Yao
We present new observations on PKS 2155-304 with the Chandra Low Energy Transmission Grating Spectrometer (LETG), using the Advanced CCD Imaging Spectrometer (ACIS). We confirm the…
GRO J1655-40: from ASCA and XMM-Newton Observations
Xiao-Ling Zhang, Shuang Nan Zhang, Gloria Sala +3
We have analysed four ASCA observations (1994--1995, 1996--1997) and three XMM-Newton observations (2005) of this source, in all of which the source is in high/soft state. We model…
Chandra Detection of Fe XVII in Absorption: Iron Abundance in the Hot Gaseous Interstellar Medium
Yangsen Yao, Norbert Schulz, Q. Daniel Wang +1
The iron depletion level and the gas-phase iron abundance in the hot ~10^6 K interstellar medium (ISM) is critical to the understanding of its energy balance as well as the thermal…
Black hole X-ray binaries LMC X-1 and X-3: observations confront spectral models
Yangsen Yao, Q. Daniel Wang, Shuang Nan Zhang
We present a comprehensive spectral analysis of black hole X-ray binaries, LMC X-1 and LMC X-3, based on BeppoSAX observations. We test both the multi-color disk plus power law (MC…