Advection-Dominated Models of Luminous Accreting Black Holes

Details Advection-Dominated Models of Luminous Accreting Black Holes Advection-Dominated Models of Luminous Accreting Black Holes

1995-10-05

arxiv.org/abs/astro-ph/9510028v1

Astrophys.J. 462 (1996) 136

Astronomy and Astrophysics

Astrophysics

12 pages compressed uuencoded postscript, including 2 figures. To appear in Part 1 of The Astrophysical Journal

Scientific paper

10.1086/177136

It has been found that a class of optically-thin two-temperature advection-dominated accretion solutions explains many observations of low-luminosity accreting black holes. Here it is shown that these models give a satisfactory description also of higher luminosity systems, provided the viscosity parameter $\alpha$ is large. The models reproduce the spectra of black hole X-ray binaries in the Low State, and explain the transition from the Low State to the High State at a critical mass accretion rate. The models also show that the X-ray/$\gamma$-ray spectra of X-ray binaries and active galactic nuclei should be similar, as confirmed by observations.

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