Astronomy and Astrophysics – Astrophysics – High Energy Astrophysical Phenomena
Scientific paper
2009-04-17
Astrophys.J.700:L47-L50,2009
Astronomy and Astrophysics
Astrophysics
High Energy Astrophysical Phenomena
4 pages, uses emulateapj and apjfonts (both included). 4 color figures. ApJL in press. High resolution version at: http://gr
Scientific paper
10.1088/0004-637X/700/1/L47
We numerically analyze the evolution of a long-duration gamma-ray burst jet as it leaves the progenitor star and propagates to the photospheric radius, where radiation can be released. We find that the interaction of the relativistic material with the progenitor star has influences well beyond the stellar surface. Tangential collimation shocks are observed throughout the jet evolution, out to about 100 stellar radii, which is the whole range of our simulation. We find that the jet is internally hot at the photospheric radius and we compute the photospheric emission. The photosphere is a very efficient radiator, capable of converting more than half of the total energy of the jet into radiation. We show that bright photospheres are a common feature of jets born inside massive progenitor stars and that this effect can explain the high radiative efficiency observed in long-duration bursts.
Begelman Mitch
Lazzati Davide
Morsony Brian J.
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