Black Hole Spin in X-Ray Binaries: Observational Consequences

Abstract

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.

18 pages, 1 table, 2 figures. Accepted for ApJ Letters, to appear in Vol. 482, June 20

References in corpus (3)

• An unstable central disk in the superluminal black-hole X-ray binary GRS 1915+105
• The 1996 Soft State Transitions of Cygnus X-1
• The 67 Hz Feature in the Black Hole Candidate GRS 1915+105 as a Possible ``Diskoseismic'' Mode

Cited by in corpus (358)

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• A Revised Spin of the Black Hole in GRS 1716-249 with a New Distance
• Testing General Relativity with Black Holes
• Multi-mission view of extragalactic black hole X-ray binaries LMC X-1 and LMC X-3: evolution of broadband spectral features
• Tidal perturbations of an extreme mass ratio inspiral around a Kerr black hole