期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 326, 期 2, 页码 417-427出版社
BLACKWELL SCIENCE LTD
DOI: 10.1046/j.1365-8711.2001.04450.x
关键词
accretion, accretion discs; radiative transfer; stars : individual : Cyg X-1 galaxies : Seyfert; gamma-rays : theory; X-rays : general
We compute the X-ray spectra produced by non-static coronae atop accretion discs around black holes and neutron stars. The hot corona is radiatively coupled to the underlying disc (the reflector) and generates an X-ray spectrum which is sensitive to the bulk velocity of the coronal plasma, beta = v/c. We show that an outflowing corona. reproduces the hard-state spectrum of Cyg X-1 and similar objects. The dynamic model predicts a correlation between the observed amplitude of reflection R and the X-ray spectrum slope Gamma since both strongly depend on beta. A similar correlation was observed and its shape was well fitted by the dynamic model. The scattering of soft radiation in an outflowing corona can also account for the observed optical-UV polarization pattern in active galactic nuclei.
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