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X-ray and gamma-ray spectra of Cyg X-1 in the soft state

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arxiv astro-ph/9707213 v2 pith:3JQ2BYLJ submitted 1997-07-17 astro-ph

X-ray and gamma-ray spectra of Cyg X-1 in the soft state

classification astro-ph
keywords softx-raydiskgamma-rayspectrastateaccretionalpha
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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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