Oscillations of Thick Accretion Discs Around Black Holes
arXiv:astro-ph/0411654 · doi:10.1111/j.1745-3933.2005.00011.x
Abstract
We present a numerical study of the response of a thick accretion disc to a localized, external perturbation with the aim of exciting internal modes of oscillation. We find that the perturbations efficiently excite global modes recently identified as acoustic p--modes, and closely related to the epicyclic oscillations of test particles. The two strongest modes occur at eigenfrequencies which are in a 3:2 ratio. We have assumed a constant specific angular momentum distribution within the disc. Our models are in principle scale--free and can be used to simulate accretion tori around stellar or super massive black holes.
4 pages, 4 figures, accepted for publication as a letter in the Monthly Notices of the Royal Astronomical Society