BibTeX
@MISC{Beloborodov03interactionof,
author = {Andrei M. Beloborodov},
title = {Interaction of GRB fireballs with ambient medium},
year = {2003}
}
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Abstract
The customary picture of the fireball deceleration by an external medium neglects two physical agents in the problem that are important at radii R < 10 17 cm: a radiative precursor (the prompt GRB) and a relativistic front of free neutrons. The radiative precursor preaccelerates the medium and loads it with e ± pairs. This provides a new explanation for the early optical flashes in GRBs. The front of free neutrons must form in a standard baryonic fireball and change the mechanism of the fireball deceleration. The neutron effect, however, disappears if the fireball is strongly dominated by the Poynting flux. The neutrons thus provide a unique link between the progenitor physics and the observed external blast wave. The explosion mechanism at R < 10 17 cm is testable with upcoming observations of early afterglows. 1
Keyphrases
grb fireball ambient medium fireball deceleration radiative precursor free neutron physical agent standard baryonic fireball progenitor physic unique link early optical flash observed external blast wave upcoming observation relativistic front poynting flux prompt grb explosion mechanism customary picture neutron effect external medium neglect new explanation early afterglow
