Disc instability as an energy source for quasi-periodic oscillations

Details Disc instability as an energy source for quasi-periodic oscillations Disc instability as an energy source for quasi-periodic oscillations

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007ragt.meet...79h&link_type=abstract

Proceedings of RAGtime 8/9: Workshops on black holes and neutron stars, 15-19/19-21 September, 2006/2007, Hradec nad Moravicí, O

Physics

Black Hole Physics, Accretion Discs, Instabilities

Scientific paper

We discuss a scenario, in which the energy for quasi-periodic oscillations comes from instabilities of the accretion disc. We demonstrate this mechanism on the interaction among stable and unstable modes of oscillations in slender accretion tori. In our model, the unstable non-axisymmetric corotation modes are nonlinearly coupled to stable acoustic modes of torus oscillations. The increasing energy of corotation modes is advected to the acoustic modes by the means of parametric instability. The stable modes may reach substantial amplitudes even if they are damped according to the linear theory.

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