Astronomy and Astrophysics – Astrophysics
Scientific paper
1997-04-09
Astrophys.J. 482 (1997) L155
Astronomy and Astrophysics
Astrophysics
18 pages, 1 table, 2 figures. Accepted for ApJ Letters, to appear in Vol. 482, June 20
Scientific paper
10.1086/310705
We discuss the observational consequences of black hole spin in X-ray binaries within the framework of the standard thin accretion disk model. When compared to theoretical flux distribution from the surface of a thin disk surrounding a Kerr black hole, the observed X-ray properties of the Galactic superluminal jet sources, GRO J1655-40 and GRS 1915+105, strongly suggest that each contains a black hole spinning rapidly in the same direction as the accretion disk. We show, however, that some other black hole binaries with an ultra-soft X-ray component probably harbor only non- or slowly-spinning black holes, and we argue that those with no detectable ultra-soft component above 1-2 keV in their high luminosity state may contain a fast-spinning black hole but with a retrograde disk. Therefore, all classes of known black hole binaries are united within one scheme. Furthermore, we explore the possibility that spectral state transitions in Cyg X-1 are simply due to temporary disk reversal, which can occur in a wind accretion system.
Chen Wan
Cui Wei-Wei
Zhang Shuang Nan
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