Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-07-08
Astrophys.J. 618 (2004) 413-425
Astronomy and Astrophysics
Astrophysics
12 pages, 6 figues; submitted to ApJ
Scientific paper
10.1086/425899
We use data on the image size of the radio afterglow of GRB 030329 (Taylor et al. 2004) to constrain the physical parameters of this explosion. Together with the observed broad band spectrum, this data over-constrains the physical parameters, thus enabling to test different GRB jet models for consistency. We consider two extreme models for the lateral spreading of the jet: model 1 with relativistic expansion in the local rest frame, and model 2 with little lateral expansion as long as the jet is highly relativistic. We find that both models are consistent with the data for a uniform external medium, while for a stellar wind environment model 1 is consistent with the data but model 2 is disfavored by the data. Our derivations can be used to place tighter constraints on the dynamics and structure of GRB jets in future afterglows, following a denser monitoring campaign for the temporal evolution of their image size.
Granot Jonathan
Loeb Abraham
Ramirez-Ruiz Enrico
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