On the Efficiency of Internal Shocks in Gamma-Ray Bursts
- 10 August 2000
- journal article
- Published by American Astronomical Society in The Astrophysical Journal
- Vol. 539 (1) , L25-L28
- https://doi.org/10.1086/312830
Abstract
The fraction of a fireball kinetic kinetic energy that can be radiated away by internal shocks is sensitive to the amplitude of initial fluctuations in the fireball. We give a simple analytical description for dissipation of modest-amplitude fluctuations and confirm it with direct numerical simulations. At high amplitudes, the dissipation occurs in a non-linear regime with efficiency approaching 100 %. Most of the explosion energy is then radiated away by the prompt GRB and only a fraction remains to be radiated by the afterglow.Comment: submitted to ApJ LetterKeywords
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