Astronomy and Astrophysics – Astrophysics
Scientific paper
1998-01-27
Astrophys.J. 503 (1998) 314-320
Astronomy and Astrophysics
Astrophysics
14 pages, 3 figures, to appear in ApJ, vol. 503; revised version, errors in some equations corrected, Figure 1 altered (includ
Scientific paper
10.1086/305995
We present an analytical approach to calculate the hydrodynamics of the interaction between a relativistic ejecta and a surrounding medium, whose evolution serves as a model for Gamma-Ray Burst afterglows. We investigate the effect of the relevant model parameters on the X-ray, optical and radio fluxes, and the effect of a refreshed shock energy input and anisotropy in the ejecta on the shape of the light curves. We compare our numerical results to observed afterglows and give a quantitative description of the conditions (geometry and physical parameters) in the ejecta that are compatible with the light curves of the 970508 afterglow, for which a large number of accurate flux measurements are available.
Meszaros Peter
Panaitescu Alin
Rees Martin J.
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