Rapid AGN accretion from counter-rotating discs

Details Rapid AGN accretion from counter-rotating discs Rapid AGN accretion from counter-rotating discs

2012-02-29

arxiv.org/abs/1203.0008v1

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

6 pages, 8 figures. Accepted for publication in MNRAS. Movies of the simulations are available at http://www.astro.le.ac.uk/us

Scientific paper

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 (SPH) simulations. These suggest that accretion rates on to supermassive black holes may be larger by factors $\gtrsim 100$ if the disc is internally tilted in this way rather than planar. This offers a natural way of driving the rapid growth of supermassive black holes, and the coalescence of SMBH binaries.

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