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Compton scattering in a converging fluid flow - III Spherical supercritical accretion

Payne, D. G. and Blandford, R. D. (1981) Compton scattering in a converging fluid flow - III Spherical supercritical accretion. Monthly Notices of the Royal Astronomical Society, 196 (4). pp. 781-795. ISSN 0035-8711.

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Radiative transfer in spherical, supercritical accretion on to a massive black hole is considered. Particular emphasis is placed on the case of non-adiabatic flow in which electron scattering in the converging flow is the dominant source of opacity and photon heating. In escaping diffusively, the photons, which are produced mainly at the trapping radius, undergo ∼(c/u_(tr))^2 scatterings (where utr is the velocity of the flow at the trapping radius), each one giving a secular fractional energy increase ∼(u_(tr)/c)^2 and a total average increase of order unity. The emitted radiation spectrum will be a superposition of the locally produced spectra at low frequencies and a power-law at high frequencies. For gas accreting radially with the free-fall speed, the spectral index observed in the outflowing radiation is α~2. Both thermal and non-thermal emission processes are discussed. The conditions under which bulk heating of the photons is important are specified.

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Blandford, R. D.0000-0002-1854-5506
Additional Information:© 1981 Royal Astronomical Society. Provided by the NASA Astrophysics Data System. Received 1980 December 22; in original form 1980 October 28. We thank the Director and staff of the National Radio Astronomy Observatory, Charlottesville (RB) and the Aspen Center for Physics (RB and DGP) where part of this work was carried out, for hospitality. Support under the National Science Foundation grants AST78-05484 and AST79-22012 is gratefully acknowledged. Roger Blandford is an Alfred P. Sloan Foundation Research Fellow.
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Alfred P. Sloan FoundationUNSPECIFIED
Issue or Number:4
Record Number:CaltechAUTHORS:20190521-165453244
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Official Citation:D. G. Payne, R. D. Blandford, Compton scattering in a converging fluid flow – III Spherical supercritical accretion, Monthly Notices of the Royal Astronomical Society, Volume 196, Issue 4, 1 October 1981, Pages 781–795,
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:95665
Deposited By: George Porter
Deposited On:23 May 2019 17:51
Last Modified:03 Oct 2019 21:15

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