Estimating the Spin of Stellar-Mass Black Holes via Spectral Fitting of the X-ray Continuum

Details Estimating the Spin of Stellar-Mass Black Holes via Spectral Fitting of the X-ray Continuum Estimating the Spin of Stellar-Mass Black Holes via Spectral Fitting of the X-ray Continuum

2005-08-14

arxiv.org/abs/astro-ph/0508302v2

Astrophys.J.636:L113-L116,2006

Astronomy and Astrophysics

Astrophysics

Accepted for publication in ApJ Letters, 13 pages, 3 figures; revised to include effects of power-law spectral component; spin

Scientific paper

10.1086/498938

We fit X-ray spectral data in the thermal dominant or high soft state of two dynamically confirmed black holes, GRO J1655-40 and 4U 1543-47, and estimate the dimensionless spin parameters a* = a/M of the two holes. For GRO J1655-40, using a spectral hardening factor computed for a non-LTE relativistic accretion disk, we estimate a* ~ 0.75 and ~ 0.65-0.75, respectively, from ASCA and RXTE data. For 4U 1543-47, we estimate a* ~ 0.75-0.85 from RXTE data. Thus, neither black hole has a spin approaching the theoretical maximum a* = 1.

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