2014MNRAS.445L...1L -
Mon. Not. R. Astron. Soc., 445, L1-L5 (2014/November-3)
Testing the neutrino annihilation model for launching GRB jets.
LENG M. and GIANNIOS D.
Abstract (from CDS):
The mechanism behind the launching of gamma-ray burst (GRB) jets remains debated resulting in large uncertainty over the jet composition. Both magnetohydrodynamical and neutrino annihilation models have been proposed for the energy extraction in a black hole/accretion-disc central engine. In particular, for the extreme accretion rates {dot}M∼0.1–1 M☉/s expected for bursts of duration T ≲ 100s, the disc can be an efficient neutrino emitter. Neutrino-antineutrino annihilation results in an energy deposition rate at the jet that can, in principle, account for the burst's energetics. Recent discoveries of X-ray flares hours after the burst and of ultra-long GRBs suggest that GRB activity can last for ∼ 104s or longer. These long-lived events have fluence similar to that of classical GRBs. In view of these findings, we re-evaluate the neutrino annihilation model. We derive the maximum possible energy of a neutrino-powered jet as a function of the burst duration and show that the available energy drops fast for longer bursts. For a standard choice of the parameters, the model falls short by three to four orders of magnitude in explaining the observed energetics of events that last longer than ∼ 103s.
Abstract Copyright:
© 2014 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2014)
Journal keyword(s):
accretion, accretion discs - black hole physics - gamma-ray burst: general
Simbad objects:
3
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