Observational constraints on the models of disk accretion onto a black hole
作者:
Sergei A. Grebenev,
Rashid A. Sunyaev,
Mikhail N. Pavlinsky,
期刊:
AIP Conference Proceedings
(AIP Available online 1994)
卷期:
Volume 308,
issue 1
页码: 61-66
ISSN:0094-243X
年代: 1994
DOI:10.1063/1.45949
出版商: AIP
数据来源: AIP
摘要:
Observations of Galactic black hole candidates performed with the ART‐P telescope aboardGranatin 1990–1992 focused our attention on studying of the sources spectral variability vs the accretion rate. We show that in contrast with the current scenario of disk accretion onto a black hole the hard spectral state of the sources always occurs at smaller accretion rate than the soft state. The arguments are presented that hard x‐rays detected during the ‘‘very high’’ and ‘‘low’’ states of black hole candidates have a distinct origin. ©1994 American Institute of Physics.
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