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P-mode oscillation on slim discs

Published online by Cambridge University Press:  07 March 2016

Li Xue  and
Ju-Fu Lu
Li Xue
Affiliation:
Department of Astronomy and Institute of Theoretical Physics and Astrophysics, Xiamen University, Xiamen, Fujian 361005, China email: lixue@xmu.edu.cn
Ju-Fu Lu
Affiliation:
Department of Astronomy and Institute of Theoretical Physics and Astrophysics, Xiamen University, Xiamen, Fujian 361005, China email: lixue@xmu.edu.cn
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Abstract

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We numerically investigate the thermally unstable accretion discs around spinning black holes with different spins. We adopted an additional evolutionary viscosity equation to replace the standard alpha-prescription based on the results of two MHD simulations. We find an interesting oscillation when accretion switches to slim disc mode. The oscillation arises from the sonic point of accretion flow and propagates outwards. We mimic the bolometric light-curve and find a series of harmonics on its power spectrum. The frequency ratio of those harmonics is a regular integer series. The lowest frequency of the harmonics is identical to the prediction of trapped p-mode in QPO theory.

Keywords

accretionaccretion disksgravitationrelativistic processesstars: black holesX-rays: bursts
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 10 , Issue S312: Star Clusters and Black Holes in Galaxies across Cosmic Time , August 2014 , pp. 141 - 142
Copyright
Copyright © International Astronomical Union 2016 

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