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Hyperaccretion

Published online by Cambridge University Press:  01 August 2006

Andrew R. King
Andrew R. King*
Affiliation:
Theoretical Astrophysics Group, University of Leicester, Leicester LE1 7RH, UK email: [email protected]
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Abstract

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Accretion at rates exceeding the Eddington limit is common in close binaries. I summarize the arguments leading to the conclusion that such stellar–mass systems appear as ultraluminous X-ray sources when viewed close the the inner accretion disc axis, and like SS433 when viewed from other angles.

I show that AGN are unlikely to achieve electron–scattering Eddington ratios as high as ULXs, so there are few ULX analogues among quasars. However hyperaccretion of dusty matter is common among AGN. The resulting outflow naturally has a toroidal geometry, and may well be the origin of the dusty torus invoked in unified AGN schemes.

Keywords

Black hole physics – accretionaccretion discs – X-rays: binaries – galaxies: active
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Symposium S238: Black Holes from Stars to Galaxies – Across the Range of Masses , August 2006 , pp. 31 - 36
Copyright
Copyright © International Astronomical Union 2007

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