Spectral states of Galactic black hole candidates: Results of observations with ART-P/Granat

Observations of Galactic black hole candidates performed with the ART-P telescope aboard Granat in 1990–1992 focused our attention on the problem of studying spectral variability of these sources as a function of the accretion rate. We show that in contrast with the current models of disk accretion...

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Bibliographic Details
Published in:Advances in space research 1997, Vol.19 (1), p.15-23
Main Authors: Grebenev, S.A, Sunyaev, R.A, Pavlinsky, M.N
Format: Article
Language:English
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Summary:Observations of Galactic black hole candidates performed with the ART-P telescope aboard Granat in 1990–1992 focused our attention on the problem of studying spectral variability of these sources as a function of the accretion rate. We show that in contrast with the current models of disk accretion onto a black hole the hard spectral state of the sources in which they exhibit a Cyg X-1 type hard X-ray spectrum always occurs at smaller accretion rate than the soft state. The arguments that hard X-rays detected during the “very high” and “low” states of black hole candidates have a distinct origin are presented.
ISSN:0273-1177
1879-1948
DOI:10.1016/S0273-1177(97)00031-8