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The structure and emission of an inner disk and a corona in the low/hard state

Published online by Cambridge University Press:  21 February 2013

Erlin Qiao  and
Bifang Liu
Erlin Qiao
Affiliation:
National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China email: qiaoel@nao.cas.cn
Bifang Liu
Affiliation:
National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China email: qiaoel@nao.cas.cn
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Abstract

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Recent observations reveal that a cool disk may survive in the innermost stable circular orbit (ISCO) for some black hole X-ray binaries in the low/hard state. The spectrum is characterized by a power law with a photon index Γ ~ 1.5-2.1 in the range of 2-10 keV and a weak disk component with temperature of ~ 0.2 keV. The formation of such a cool disk in the most inner region of black hole X-ray binaries at the low/hard state is investigated within the framework of disk accretion fed by condensation of hot corona. We also calculate the emergent spectra of the inner disk and corona. It's found that our model can very well explain the spectral features of GX 339-4 and Cyg X-1, in which the thin disk may exist at ISCO in the low/hard state.

Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 8 , Symposium S290: Feeding Compact Objects: Accretion on All Scales , August 2012 , pp. 299 - 300
Copyright
Copyright © International Astronomical Union 2013

References

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