On the Fate of Gas Accreting at a Low Rate onto a Black Hole

Details On the Fate of Gas Accreting at a Low Rate onto a Black Hole On the Fate of Gas Accreting at a Low Rate onto a Black Hole

1998-09-07

arxiv.org/abs/astro-ph/9809083v1

Mon.Not.Roy.Astron.Soc. 303 (1999) L1

Astronomy and Astrophysics

Astrophysics

5 pages, 2 figures, submitted to Monthly Notices of the Royal Astronomical Society Letters

Scientific paper

10.1046/j.1365-8711.1999.02358.x

Gas supplied conservatively to a black hole at rates well below the Eddington rate may not be able to radiate effectively and the net energy flux, including the energy transported by the viscous torque, is likely to be close to zero at all radii. This has the consequence that the gas accretes with positive energy so that it may escape. Accordingly, we propose that only a small fraction of the gas supplied actually falls onto the black hole and that the binding energy it releases is transported radially outward by the torque so as to drive away the remainder in the form of a wind. This is a generalization of and an alternative to an "ADAF" solution. Some observational implications and possible ways to distinguish these two types of flow are briefly discussed.

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