The Spin of the Black Hole Primary in LMC X-1

Details The Spin of the Black Hole Primary in LMC X-1 The Spin of the Black Hole Primary in LMC X-1

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21541942g&link_type=abstract

American Astronomical Society, AAS Meeting #215, #419.42; Bulletin of the American Astronomical Society, Vol. 36, p.1113

Astronomy and Astrophysics

Astronomy

Scientific paper

Using a selected sample of 18 RXTE PCA spectra, we have determined the dimensionless spin parameter of the black hole in LMC X-1 to be a*=0.92 (-0.07, +0.05) (68% confidence range). The standard deviation around the mean value of a* for these 18 spectra, which were obtained over a span of several years is only 2%. This high spin is confirmed by our analyses of selected X-ray spectra obtained by the XMM-Newton, BeppoSAX and Ginga missions, as well as by our complete sample of 53 RXTE PCA spectra. We determined the spin by fitting the thermal X-ray continuum spectrum with our fully relativistic model of a thin accretion disk. Knowledge of black hole spin is crucial in many ways. For example spin is central to most theories of relativistic jets observed in both the supermassive black holes in Active Galactic Nuclei as well as stellar-mass black holes in microquasars.

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