Gamma-Ray Bursts from Accreting Black Holes

Details Gamma-Ray Bursts from Accreting Black Holes Gamma-Ray Bursts from Accreting Black Holes

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aipc..662..217l&link_type=abstract

GAMMA-RAY BURST AND AFTERGLOW ASTRONOMY 2001: A Workshop Celebrating the First Year of the HETE Mission. AIP Conference Proceed

Astronomy and Astrophysics

Astronomy

1

Gamma-Ray Sources, Gamma-Ray Bursts, Neutron Stars, Black Holes

Scientific paper

We show the hydrodynamical evolution of massive accretion disks around black holes, formed when a neutron star is disrupted by a black hole in a binary system. The time dependence is followed in two dimensions assuming azimuthal symmetry for 0.2 seconds, using an ideal gas equation of state. The disk evolves because of the transport of angular momentum due to viscosity. We estimate the energy released in neutrinos, as well as through magnetic-dominated mechanisms, and find it can be as high as Ev ~ 1052 erg and EBZ ~ 1051 erg respectively, in approximately 0.1-0.2 seconds. Of the former, only a small fraction (a few per cent) would potentially be capable of producing a burst through vv annihilation, while in principle the latter could do so almost entirely. Thus these systems could in principle account for the energetics of short gamma ray bursts.

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