Journal Article

Jet-enhanced accretion growth of supermassive black holes

E. J. D. Jolley and Z. Kuncic

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 386, issue 2, pages 989-994
Published in print May 2008 | ISSN: 0035-8711
Published online April 2008 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2008.13082.x
Jet-enhanced accretion growth of supermassive black holes

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We investigate the effect of a disc-driven jet on the accretion growth of cosmological supermassive black holes (SMBHs). The presence of a jet enhances the mass growth rate because for a given luminosity, the mass accretion rate, , is higher (or equivalently, the radiative efficiency εr is lower for a fixed ) than that predicted by standard accretion disc theory. As jets carry away very little of the accreting matter, a larger proportion of the rest mass can reach the black hole during episodes of jet activity. We show quantitatively that the conditions required to grow a rapidly spinning black hole to a mass ≈109M by redshift z≈ 6, whilst satisfying the observational constraint εr≳ 0.1, are considerably less restrictive for jet-enhanced disc accretion than for standard disc accretion, which requires implausibly high super-Eddington accretion rates. Furthermore, jet-enhanced accretion growth offers a viable explanation for the observed correlation between black hole mass and radio loudness of quasars.

Keywords: accretion, accretion discs; black hole physics; galaxies: evolution; galaxies: jets

Journal Article.  3668 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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