Constraints on the emission mechanisms of gamma-ray bursts

Abstract

If the emission of gamma-ray bursts were due to the synchrotron process in the standard internal shock scenario, then the typical observed spectrum should have a slope F(nu) \propto nu^{-1/2}, which strongly conflicts with the much harder spectra observed. This directly follows from the cooling time being much shorter than the dynamical time. Particle re-acceleration, deviations from equipartition, fastly changing magnetic fields and adiabatic losses are found to be inadequate to account for this discrepancy. We also find that in the internal shock scenario the relativistic inverse Compton scattering is always as important as the synchrotron process, and faces the same problems. This indicates that the burst emission is not produced by relativistic electrons emitting synchrotron and inverse Compton radiation.

5 pages, accepted for publications in MNRAS, pink pages

References in corpus (2)

• The discovery of polarization in the afterglow of GRB 990510 with the ESO Very Large Telescope
• Constraints on the bulk Lorentz factor in the internal shock scenario for gamma-ray bursts

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