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The black hole spins of quasars

Published online by Cambridge University Press:  07 March 2016

Bei You
Affiliation:
Key Laboratory for Research in Galaxies and Cosmology, Shanghai Astronomical Observatory, Chinese Academy of Sciences, 80 Nandan Road, Shanghai, 200030, China email: youbeiyb@gmail.com University of Chinese Academy of Sciences, 19A Yuquanlu, Beijing 100049, China
Xinwu Cao
Affiliation:
Key Laboratory for Research in Galaxies and Cosmology, Shanghai Astronomical Observatory, Chinese Academy of Sciences, 80 Nandan Road, Shanghai, 200030, China email: youbeiyb@gmail.com
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Abstract

We present the estimates of the black hole spins of five quasars. The peaks of the spectra of the accretion discs surrounding massive black holes in quasars are in the far-UV or soft X-ray band, which are usually not observed. However, in the disc corona model, the soft photons from the disc are Comptonized to high energy in the hot corona, and the hard X-ray spectra (luminosity and spectral shape) contain the information of the incident spectra from the disc. The values of black hole spin parameter a are inferred from the spectral fitting, which spread over a large range, ~ −0.94 to 0.998.

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Contributed Papers
Copyright
Copyright © International Astronomical Union 2016 

References

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