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|Title:||Rapid AGN accretion from counter-rotating discs|
|Authors:||Nixon, C. J.|
King, A. R.
Price, D. J.
|Citation:||Monthly Notices of the Royal Astronomical Society , 2012, 422 (3), pp. 2547-2552|
|Abstract:||Accretion in the nuclei of active galaxies may occur chaotically. This can produce accretion discs which are counter-rotating or strongly misaligned with respect to the spin of the central supermassive black hole (SMBH), or the axis of a close SMBH binary. Accordingly we consider the cancellation of angular momentum in accretion discs with a significant change of plane (tilt) between inner and outer parts. We estimate analytically the maximum accretion rate through such discs and compare this with the results of smoothed particle hydrodynamics simulations. These suggest that accretion rates on to SMBH may be larger by factors of ≳100 if the disc is internally tilted in this way rather than planar. This offers a natural way of driving the rapid growth of SMBH and the coalescence of SMBH binaries.|
|Rights:||This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2012 the authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. Deposited with reference to the publisher’s archiving policy available on the SHERPA/RoMEO website.|
|Appears in Collections:||Published Articles, Dept. of Physics and Astronomy|
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