st ro - p h / 01 11 45 4 v 1 2 3 N ov 2 00 1 Hydrodynamics of Relativistic Blast Waves in a Density - Jump Medium and Their Emission Signature


We analyze in detail the hydrodynamics and afterglow emission of an ultrarelativistic blast wave when it expands in a density-jump medium. Such a medium is likely to appear in the vicinity of gamma-ray bursts (GRBs) associated with massive stars. The interaction of the blast wave with this medium is described through a reverse shock and a forward shock. We… (More)


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