The Extreme Spin of the Black Hole in Cygnus X-1

@article{Gou2011TheES,
  title={The Extreme Spin of the Black Hole in Cygnus X-1},
  author={Lijun Gou and Jeffrey E. McClintock and Mark J. Reid and Jerome A. Orosz and James F. Steiner and Ramesh Narayan and Jingen Xiang and Ronald A. Remillard and Keith A. Arnaud and Shane W. Davis},
  journal={The Astrophysical Journal},
  year={2011},
  volume={742},
  pages={85}
}
The compact primary in the X-ray binary Cygnus X-1 was the first black hole to be established via dynamical observations. We have recently determined accurate values for its mass and distance, and for the orbital inclination angle of the binary. Building on these results, which are based on our favored (asynchronous) dynamical model, we have measured the radius of the inner edge of the black hole’s accretion disk by fitting its thermal continuum spectrum to a fully relativistic model of a thin… 
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CONFIRMATION VIA THE CONTINUUM-FITTING METHOD THAT THE SPIN OF THE BLACK HOLE IN CYGNUS X-1 IS EXTREME
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