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On the fate of gas accreting at a low rate on to a black hole

Blandford, R. D. and Begelman, M. C. (1999) On the fate of gas accreting at a low rate on to a black hole. Monthly Notices of the Royal Astronomical Society, 303 (1). L1-L5. ISSN 0035-8711. doi:10.1046/j.1365-8711.1999.02358.x.

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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 on to 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.

Item Type:Article
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URLURL TypeDescription Paper
Blandford, R. D.0000-0002-1854-5506
Additional Information:© 1999 RAS. Accepted 1998 November 20. Received 1998 November 20; in original form 1998 August 3. Published: 11 February 1999. This work was supported in part by NSF grants AST 95-29170 and AST 95-29175, and NASA grants NAG 5-2837 and NAG5-7007. We thank Martin Rees for his encouragement and insights, and acknowledge useful discussions with Phil Maloney, Mike Nowak, Chris Reynolds and Jörn Wilms and constructive comments from Marek Abramowicz, Jean-Pierre Lasota, Ramesh Narayan, Jochen Peitz and the referee. RDB thanks the Max-Planck-Institut für Astrophysik for hospitality during the completion of this research.
Funding AgencyGrant Number
NSFAST 95-29170
NSFAST 95-29175
NASANAG 5-2837
Subject Keywords:accretion, accretion discs – black hole physics – hydrodynamics
Issue or Number:1
Record Number:CaltechAUTHORS:20190603-111822615
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Official Citation:Roger D. Blandford, Mitchell C. Begelman, On the fate of gas accreting at a low rate on to a black hole, Monthly Notices of the Royal Astronomical Society, Volume 303, Issue 1, 11 February 1999, Pages L1–L5,
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:96039
Deposited By: Tony Diaz
Deposited On:03 Jun 2019 18:32
Last Modified:16 Nov 2021 17:17

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