Journal Article

Neutrino heating near hyper-accreting black holes

Ivan Zalamea and Andrei M. Beloborodov

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 410, issue 4, pages 2302-2308
Published in print February 2011 | ISSN: 0035-8711
Published online January 2011 | e-ISSN: 1365-2966 | DOI:
Neutrino heating near hyper-accreting black holes

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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 . 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.

Keywords: accretion, accretion discs; black hole physics; magnetic fields; neutrinos; relativistic processes; gamma-ray burst: general

Journal Article.  4551 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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