SIMBAD references

2006ApJ...636L.113S - Astrophys. J., 636, L113-L116 (2006/January-2)

Estimating the spin of stellar-mass black holes by spectral fitting of the X-ray continuum.

SHAFEE R., McCLINTOCK J.E., NARAYAN R., DAVIS S.W., LI L.-X. and REMILLARD R.A.

Abstract (from CDS):

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 a*∼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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Journal keyword(s): Accretion, Accretion Disks - Stars: Binaries: Close - Black Hole Physics - Stars: Individual: Alphanumeric: 4U 1543-47 - Stars: Individual: Alphanumeric: GRO J1655-40 - X-Rays: Stars

Simbad objects: 5

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