Estimating the Spin of Stellar-Mass Black Holes by Spectral Fitting of the X-Ray Continuum | Zendy

Rebecca Shafee | Zendy; Jeffrey E. McClintock | Zendy; Ramesh Narayan | Zendy; Shane W. Davis | Zendy; LiXin Li | Zendy; Ronald A. Remillard | Zendy

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Estimating the Spin of Stellar-Mass Black Holes by Spectral Fitting of the X-Ray Continuum

Author(s) -

Rebecca Shafee,

Jeffrey E. McClintock,

Ramesh Narayan,

Shane W. Davis,

LiXin Li,

Ronald A. Remillard

Publication year - 2005

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/498938

Subject(s) - dimensionless quantity , physics , accretion disc , astrophysics , black hole (networking) , accretion (finance) , spectral analysis , x ray , spectral properties , thermal , astronomy , optics , spectroscopy , computer network , routing protocol , routing (electronic design automation) , mechanics , computer science , link state routing protocol , meteorology

We fit X-ray spectral data in the thermal dominant or high soft state of twodynamically confirmed black holes, GRO J1655-40 and 4U 1543-47, and estimatethe 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 accretiondisk, we estimate a* ~ 0.75 and ~ 0.65-0.75, respectively, from ASCA and RXTEdata. For 4U 1543-47, we estimate a* ~ 0.75-0.85 from RXTE data. Thus, neitherblack hole has a spin approaching the theoretical maximum a* = 1.

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