Astronomy and Astrophysics – Astrophysics – High Energy Astrophysical Phenomena
Scientific paper
2011-07-27
Astrophys.J. 746 (2012) 164
Astronomy and Astrophysics
Astrophysics
High Energy Astrophysical Phenomena
12 pages, 8 figures, accepted for publication in ApJ, discussions added, typos fixed. Results unchanged
Scientific paper
10.1088/0004-637X/746/2/164
We study effects of particle re-acceleration (or heating) in the post-shock region via magnetohydrodynamic/plasma turbulence, in the context of a mixed hadronic-leptonic model for the prompt emission of gamma-ray bursts (GRBs), using both analytical and numerical methods. We show that stochastically accelerated (or heated) leptons, which are injected via pp and pg reactions and subsequent pair cascades, are plausibly able to reproduce the Band function spectra with alpha~1 and beta~2-3 in the ~MeV range. An additional hard component coming from the proton-induced cascade emission is simultaneously expected, which is compatible with observed extra power-law spectra far above the MeV range. We also discuss the specific implications of hadronic models for ongoing high-energy neutrino observations.
Asano Katsuaki
Meszaros Peter
Murase Kohta
Terasawa Toshio
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