Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-04-28
Astrophys.J. 608 (2004) L5-L8
Astronomy and Astrophysics
Astrophysics
Accepted for publication in ApJ Letters
Scientific paper
10.1086/422217
Cosmological gamma ray bursts (GRBs) are thought to occur from violent hypercritical accretion onto stellar mass black holes, either following core collapse in massive stars or compact binary mergers. This dichotomy may be reflected in the two classes of bursts having different durations. Dynamical calculations of the evolution of these systems are essential if one is to establish characteristic, relevant timescales. We show here for the first time the result of dynamical simulations, lasting approximately one second, of post--merger accretion disks around black holes, using a realistic equation of state and considering neutrino emission processes. We find that the inclusion of neutrino optical depth effects produces important qualitative temporal and spatial transitions in the evolution and structure of the disk, which may directly reflect upon the duration and variability of short GRBs.
Lee William H.
Page Dany
Ramirez-Ruiz Enrico
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