Short-duration Gamma-ray Bursts From Off-axis Collapsars

Type Journal Article
Names Davide Lazzati, Brian J. Morsony, Mitchell C. Begelman
Publication The Astrophysical Journal
Volume 717
Issue 1
Pages 239-244
Date July 1, 2010
Library Catalog NASA ADS
Abstract We present two-dimensional (2D) high-resolution hydrodynamic simulations of the relativistic outflows of long-duration gamma-ray burst (GRB) progenitors. We analyze the properties of the outflows at wide off-axis angles, produced by the expansion of the hot cocoon that surrounds the jet inside the progenitor star. We find that the cocoon emission at wide angles may have properties similar to those of the subclass of short-duration GRBs with persistent X-ray emission. We compute the predicted duration distribution, redshift distribution, and afterglow brightness, and we find that they are all in agreement with the observed properties of short GRBs with persistent emission. We suggest that a supernova component, the properties of the host galaxies, and late afterglow observations can be used as a crucial test to verify this model.
Tags gamma-ray burst: general, hydrodynamics, relativistic processes
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