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Title: Relativistic hydrodynamic simulation of jet deceleration in GRB
Authors: Meliani, Zakaria ×
Keppens, Rony
Casse, F #
Issue Date: 22-May-2008
Publisher: Springer New York LLC
Series Title: AIP Conference Proceedings vol:1000 issue:1 pages:452-455
Conference: Santa Fe conference on gamma-ray bursts 2007 location:Santa Fe, USA date:5-9 November 2007
Abstract: Using the novel adaptive mesh refinement code, AMRVAC, we investigate the interaction between collimated ejecta (jetlike fireball models with various opening angle) with its surrounding cold Interstellar Medium (ISM). This is relevant for Gamma Ray Bursts, and we demonstrate that, thanks to the AMR strategy, we resolve the internal structure of the shocked shell-ISM matter. We determine the deceleration from an initial Lorentz factor {gamma} = 100 up to the almost Newtonian {gamma}{approx}O(3) phase of the flow. We discuss the effect of varying the opening angle on the deceleration, and pay attention to differences with their 1D isotropic GRB equivalents. These are due to thermally induced sideways expansions of both shocked shell and shocked ISM regions. The propagating 2D ultrarelativistic shell does not accrete all the surrounding medium located within its initial opening angle. The difference with isotropic GRB models is quite pronounced for shells with small opening angle. In the most collimated ejecta (open angle of 1 deg.), the deceleration phase (once the reverse shock has traversed the shell structure) shows distinct modulation, attributed to repeated rarefactions traversing the shell. These may have a clear impact on the emitted afterglow radiation.
ISSN: 0094-243X
Publication status: published
KU Leuven publication type: IC
Appears in Collections:Plasma-astrophysics Section
× corresponding author
# (joint) last author

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