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Optically thick accretion onto black holes

Authors:	Shuichi Tamazawa Kiyotaka Toyama Noboru Kaneko Yôrô Ôno

Institution:	(1) Dept. of Physics, Faculty of Science, Hokkaido University, Sapporo, Japan

Abstract:	Spherically symmetric, steady-state, optically thick accretion onto a nonrotating black hole with the mass of $\mathfrak{M} = \mathfrak{M}_ \odot$ is studied. The gas accreting onto the black hole is assumed to be a fully ionized hydrogen plasma withn ₀=10⁸ cm^–3 andT ₀=10⁴ K far from the black hole, and a new approximate expression for the Eddington factor is introduced. The luminosity is estimated to beL=1.875×10³³ erg s^–1, which primarily arises from the optical surface (1) ofT10⁴ K. The accretion flow is characterized by 1 and (v/c)10. In the optically thin region, the flow remains isothermal, and the increase of temperature occurs at 1. The radiative equilibrium is strictly realized at (v/c)10.

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