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Photospheric Emission from Gamma-Ray Bursts

Published online by Cambridge University Press:  22 July 2013

M. Axelsson
M. Axelsson*
Affiliation:
Oskar Klein Center, Department of Physics, Stockholm University, 106 91 Stockholm, Sweden Department of Physics, KTH Royal Institute of Technology, 106 91 Stockholm, Sweden
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Abstract

In spite of extensive research over the past decades, a complete physical picture of the origin of the prompt gamma-ray burst emission is still lacking. During recent years, evidence has been accumulating that the jet photosphere plays an important role. In this paper we summarize the lessons learned from Fermi observations regarding the behavior of the photosphere and discuss why photospheric emission does not necessarily appear as blackbody radiation. We concentrate on two strong and important bursts, GRB 090902B and GRB 110721A, which serve as examples of the standard appearance photospheric emission may have in gamma-ray burst spectra.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 61: Gamma-ray Bursts: 15 Years of GRB Afterglows – Progenitors, Environments and Host Galaxies from the Nearby to the Early Universe , 2013 , pp. 53 - 57
Copyright
© EAS, EDP Sciences 2013

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