Journal Article

The effects of thermal conduction on the ADAF with a toroidal magnetic field

S. Abbassi, J. Ghanbari and S. Najjar

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 388, issue 2, pages 663-668
Published in print August 2008 | ISSN: 0035-8711
Published online July 2008 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2008.13408.x
The effects of thermal conduction on the ADAF with a toroidal magnetic field

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The observation of the hot gas surrounding Sgr A* and a few other nearby galactic nuclei imply that electron and proton mean free paths are comparable to the gas capture radius. So, the hot accretion flows are likely to proceed under week-collision conditions. Hence, thermal conduction has been suggested as a possible mechanism by which the sufficient extra heating is provided in hot advection-dominated accretion flow (ADAF) accretion discs. We consider the effects of thermal conduction in the presence of a toroidal magnetic field in an ADAF around a compact object. For a steady-state structure of such accretion flows, a set of self-similar solutions are presented. We find two types of solutions which represent high and slow accretion rate. They have different behaviours with saturated thermal conduction parameter, φ.

Keywords: accretion, accretion discs; black hole physics; conduction

Journal Article.  4159 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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