Spectral Variations of Cyg X-1 in the Hard State Studied with ASCA Data

Details Spectral Variations of Cyg X-1 in the Hard State Studied with ASCA Data Spectral Variations of Cyg X-1 in the Hard State Studied with ASCA Data

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001pasj...53.1171t&link_type=abstract

Publications of the Astronomical Society of Japan, Vol.53, No. 6, pp. 1171-1177

Astronomy and Astrophysics

Astronomy

2

Accretion, Accretion Disks, Stars: Individual (Cyg X-1), X-Rays: General, X-Rays: Individual (Cyg X-1), X-Rays: Stars

Scientific paper

Spectral variations of Cyg X-1 in the hard state have been studied on two time scales of about 104s and 1 s using ASCA archive data. The energy spectrum was well fit by a model consisting of a multicolor blackbody expected from an optically-thick accretion disk and a broken power-law, with absorption by interstellar matter. The broken power-law component was found to change its normalization on both time scales, while keeping the spectral shape unchanged, whereas the multicolor blackbody component varies only on a time scale of 104s From this clear separation of the time variabilities, the two spectral components can be considered to be two real substances reflecting two respective emission processes different from each other. We found from a careful comparison of the disk parameters that the innermost radius in the hard state is a few times larger than that in the soft state, even if the uncertainty in a ratio of the observed color temperature to an effective temperature is taken into account. It is suggested that an optically-thin disk exists inside the optically-thick disk in the hard state and that the broken power-law component comes from the optically-thin inner disk.

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