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Title:
Non-stationary hyperaccretion of stellar-mass black holes in three dimensions: torus evolution and neutrino emission
Authors:
Setiawan, S.; Ruffert, M.; Janka, H.-Th.
Affiliation:
AA(School of Mathematics, University of Edinburgh, Edinburgh EH9 3JZ), AB(School of Mathematics, University of Edinburgh, Edinburgh EH9 3JZ), AC(Max-Planck-Institut für Astrophysik, Postfach 1317, 85741 Garching bei München, Germany)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 352, Issue 3, pp. 753-758. (MNRAS Homepage)
Publication Date:
08/2004
Origin:
MNRAS
Astronomy Keywords:
accretion, accretion discs, black hole physics, hydrodynamics, neutrinos, gamma-rays: bursts
DOI:
10.1111/j.1365-2966.2004.07974.x
Bibliographic Code:
2004MNRAS.352..753S

Abstract

We present three-dimensional hydrodynamic simulations of the evolution of self-gravitating, thick accretion discs around hyperaccreting stellar-mass black holes. The black hole-torus systems are considered to be remnants of compact object mergers, in which case the disc is not fed by an external mass reservoir and the accretion is non-stationary. Our models take into account viscous dissipation, described by an α-law, a detailed equation of state for the disc gas, and an approximate treatment of general relativistic effects on the disc structure by using a pseudo-Newtonian potential for the black hole including its possible rotation and spin-up during accretion. Magnetic fields are ignored. The neutrino emission of the hot disc is treated by a neutrino-trapping scheme, and the -annihilation near the disc is evaluated in a post-processing step. Our simulations show that the neutrino emission and energy deposition by -annihilation increase sensitively with the disc mass, with the black hole spin in case of a disc in corotation, and in particular with the α-viscosity. We find that for sufficiently large α-viscosity, -annihilation can be a viable energy source for gamma-ray bursts.

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