On the Efficiency of Internal Shocks in Gamma-Ray Bursts

Details On the Efficiency of Internal Shocks in Gamma-Ray Bursts On the Efficiency of Internal Shocks in Gamma-Ray Bursts

2000-04-26

arxiv.org/abs/astro-ph/0004360v1

Astrophys.J.539:L25-L28,2000

Astronomy and Astrophysics

Astrophysics

submitted to ApJ Letters

Scientific paper

10.1086/312830

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.

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