X-ray and gamma-ray spectra of Cyg X-1 in the soft state
Marek Gierlinski, Andrzej A. Zdziarski, Tadayasu Dotani, Ken Ebisawa, Keith Jahoda, W. Neil Johnson
Abstract
We present X-ray/gamma-ray observations of Cyg X-1 in the soft state during 1996 May-June. We analyze ASCA, RXTE and OSSE data. The spectrum consists of soft X-ray blackbody emission of an optically thick accretion disk in the vicinity of a black hole and a power law with an energy index alpha around 1.2-1.5 extending to at least several hundred keV. In the spectra, we find the presence of strong Compton reflection, which probably comes from the disk.
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