Apsidal precession, disc breaking and viscosity in warped discs
journal contributionposted on 2016-05-13, 15:32 authored by Rebecca Nealon, Chris Nixon, Daniel J. Price, Andrew King
We demonstrate the importance of general relativistic apsidal precession in warped black hole accretion discs by comparing three-dimensional smoothed particle hydrodynamic simulations in which this effect is first neglected, and then included. If apsidal precession is neglected, we confirm the results of an earlier magnetohydrodynamic simulation which made this assumption, showing that at least in this case the α viscosity model produces very similar results to those of simulations where angular momentum transport is due to the magnetorotational instability. Including apsidal precession significantly changes the predicted disc evolution. For moderately inclined discs thick enough that tilt is transported by bending waves, we find a disc tilt which is non-zero at the inner disc edge and oscillates with radius, consistent with published analytic results. For larger inclinations, we find disc breaking.
RN is supported by an Australian Postgraduate Award. DJP is supported by a Future Fellowship (FT130100034) from the Australian Research Council. CN thanks NASA for support through the Einstein Fellowship Programme, grant PF2-130098. CN was supported by the Science and Technology Facilities Council (grant number ST/M005917/1). Research in theoretical astrophysics at Leicester is supported by an STFC Consolidated Grant.
CitationMonthly Notices of the Royal Astronomical Society: Letters, 2016, 455 (1), pp. L62-L66
Author affiliation/Organisation/COLLEGE OF SCIENCE AND ENGINEERING/Department of Physics and Astronomy
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