Photospheric Emission as the Dominant Radiation Mechanism in Long-duration Gamma-Ray Bursts

Type Journal Article
Names Davide Lazzati, Brian J. Morsony, Raffaella Margutti, Mitchell C. Begelman
Publication The Astrophysical Journal
Volume 765
Pages 103
Journal Abbreviation The Astrophysical Journal
Date March 1, 2013
DOI 10.1088/0004-637X/765/2/103;
ISSN 0004-637X
Library Catalog NASA ADS
Abstract We present the results of a set of numerical simulations of long-duration gamma-ray burst jets associated with massive, compact stellar progenitors. The simulations extend to large radii and allow us to locate the region in which the peak frequency of the advected radiation is set before the radiation is released at the photosphere. Light curves and spectra are calculated for different viewing angles as well as different progenitor structures and jet properties. We find that the radiation released at the photosphere of matter-dominated jets is able to reproduce the observed Amati and energy-Lorentz factor correlations. Our simulations also predict a correlation between the burst energy and the radiative efficiency of the prompt phase, consistent with observations.
Tags Methods: Numerical, gamma-ray burst: general, hydrodynamics, relativistic processes
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