Journal Article

Slim accretion discs: a model for ADAF-SLE transitions

Igor V. Igumenshchev, Marek A. Abramowicz and Igor D. Novikov

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 298, issue 4, pages 1069-1078
Published in print August 1998 | ISSN: 0035-8711
Published online August 1998 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-8711.1998.01774.x
Slim accretion discs: a model for ADAF-SLE transitions

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Abstract

We numerically construct slim, global, vertically integrated models of optically thin, transonic accretion discs around black holes, assuming a regularity condition at the sonic radius and boundary conditions at the outer radius of the disc and near the black hole. In agreement with several previous studies, we find two branches of shock-free solutions, in which the cooling is dominated either by advection or by local radiation. We also confirm that the part of the accretion flow where advection dominates is in some circumstances limited in size: it does not extend beyond a certain outer limiting radius. New results found in our paper concern the location of the limiting radius and the properties of the flow near to it. In particular, we find that beyond the limiting radius the advective-dominated solutions match on to Shapiro, Lightman &38; Eardley (SLE) discs through a smooth transition region. Therefore, the full global solutions are shock-free and unlimited in size. There is no need to postulate an extra physical effect (e.g. evaporation) for triggering the ADAF-SLE transition. It occurs as a result of standard accretion processes described by the classic slim disc equations.

Keywords: accretion, accretion discs; hydrodynamics; relativity; methods: numerical

Journal Article.  0 words. 

Subjects: Astronomy and Astrophysics

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