期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 410, 期 4, 页码 2302-2308出版社
OXFORD UNIV PRESS
DOI: 10.1111/j.1365-2966.2010.17600.x
关键词
accretion, accretion discs; black hole physics; magnetic fields; neutrinos; relativistic processes; gamma-ray burst: general
Hyper-accretion discs around black holes emit copious neutrinos and anti-neutrinos. A fraction of the emitted neutrinos convert to electron-positron plasma above the disc through the annihilation reaction nu(nu) over bar -> e+e(-). This process may drive relativistic jets associated with gamma-ray bursts (GRB) explosions. We calculate the efficiency of energy deposition by neutrinos. Our calculation is fully relativistic and based on a geodesic-tracing method. We find that the efficiency of neutrino heating is a well-defined function of (i) accretion rate and (ii) spin of the black hole. It is practically independent of the details of neutrino transport in the opaque zone of the disc. The results help identify accretion discs whose neutrino emission can power GRBs.
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