The Extreme Spin of the Black Hole Cygnus X-1

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

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21841017g&link_type=abstract

American Astronomical Society, AAS Meeting #218, #410.17; Bulletin of the American Astronomical Society, Vol. 43, 2011

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Scientific paper

Cygnus X-1 was the first black hole to be established via dynamical observations. There exist thousands of archival X-ray spectra of this source. Remarkably, however, only one of them is suitable for the measurement of spin via the continuum-fitting method that we employ. In July 2010, the source entered its rare soft state, thereby allowing us to obtain two more such spectra by making simultaneous observations with Chandra and RXTE. In other work, we have determined the source distance, black hole mass and orbital inclination angle. Inputting our accurate values of these three essential parameters, we fitted our X-ray spectra to the relativistic accretion-disk model of Novikov and Thorne and determined that Cygnus X-1 is a near-extreme Kerr black hole.

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