Gamma-ray bursts and the runaway instability of thick discs around black holes

Details Gamma-ray bursts and the runaway instability of thick discs around black holes Gamma-ray bursts and the runaway instability of thick discs around black holes

Mar 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997mnras.285l..15d&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 285, Issue 3, pp. L15-L19.

Physics

26

Accretion, Accretion Discs, Black Hole Physics, Instabilities, Gamma-Rays: Bursts

Scientific paper

In the context of cosmological models for gamma-ray bursts where the energy is extracted from a thick disc orbiting a stellar-mass black hole we discuss the stability of accretion when the specific angular momentum is increasing outwards in the disc. Discs with constant angular momentum are known to lead to a runaway instability, with catastrophic accretion taking place on a dynamical time-scale. We find that even a slight increase of the specific angular momentum outwards has a strong stabilizing effect on the accretion process. We finally comment on the limitations of our results, which are obtained with classical physics and neglecting the disc self-gravity.

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