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Astron. Astrophys. 358, 1157-1166 (2000)

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Gamma-ray bursts from internal shocks in a relativistic wind: a hydrodynamical study

F. Daigne and R. Mochkovitch

Institut d'Astrophysique de Paris, CNRS, 98 bis Boulevard Arago, 75014 Paris, France

Received 21 February 2000 / Accepted 2 May 2000


The internal shock model for gamma-ray bursts involves shocks taking place in a relativistic wind with a very inhomogeneous initial distribution of the Lorentz factor. We have developed a 1D lagrangian hydrocode to follow the evolution of such a wind and the results we have obtained are compared to those of a simpler model presented in a recent paper (Daigne & Mochkovitch 1998) where all pressure waves are suppressed in the wind so that shells with different velocities only interact by direct collisions. The detailed hydrodynamical calculation essentially confirms the conclusion of the simple model: the main temporal and spectral properties of gamma-ray bursts can be reproduced by internal shocks in a relativistic wind.

Key words: gamma rays: bursts – hydrodynamics – shock waves – relativity – radiation mechanisms: non-thermal

Present address: Max-Planck-Institut for Astrophysics, Karl-Schwarzschild-Strasse 1, 85740 Garching bei München, Germany

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© European Southern Observatory (ESO) 2000

Online publication: June 20, 2000