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

@article{Shafee2006EstimatingTS,
  title={Estimating the Spin of Stellar-Mass Black Holes by Spectral Fitting of the X-Ray Continuum},
  author={R. Shafee and J. McClintock and R. Narayan and S. Davis and Li-xin Li and R. Remillard},
  journal={The Astrophysical Journal},
  year={2006},
  volume={636}
}
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… Expand

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