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Title:
Gamma-Ray Bursts: Multiwaveband Spectral Predictions for Blast Wave Models
Authors:
Meszaros, P.; Rees, M. J.
Publication:
Astrophysical Journal Letters v.418, p.L59 (ApJL Homepage)
Publication Date:
12/1993
Origin:
APJ; KNUDSEN; NED
Astronomy Keywords:
ACCELERATION OF PARTICLES, COSMOLOGY: MISCELLANEOUS, GALAXIES: ISM, GAMMA RAYS: BURSTS, GAMMA RAYS: THEORY, RADIATION MECHANISMS: MISCELLANEOUS
DOI:
10.1086/187116
Bibliographic Code:
1993ApJ...418L..59M

Abstract

In almost any scenario for "cosmological" gamma-ray bursts (and in many models where they originate in our own Galaxy), the initial energy density is so large that the resulting relativistic plasma expands with v ~ c producing a blast wave ahead of it and a reverse shock moving into the ejecta, as it ploughs into the external medium. We evaluate the radiation expected from these shocks, for both cosmological and galactic bursts, for various assumptions about the strength of the magnetic field and the particle acceleration mechanisms in the shocks. The spectra are evaluated over the whole range from the IR to greater than GeV, and are compared with the variety of spectral behavior reported by BATSE, and with the X-ray and optical constraints. For bursts of duration >~ 1 s acceptable gamma-ray spectra and L_x_/Lgamma_ ratios are readily obtained for "cosmological" models. Blast waves in galactic models can produce bursts of similar gamma-ray fluence and duration, but they violate the X-ray paucity constraint, except for the shorter bursts (<~1 s). We discuss the prospects for using O/UV and X-ray observations to discriminate among alternative models.

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