Photospheric emission as the dominant radiation mechanism in long-duration gamma-ray bursts

Davide Lazzati*, Brian J. Morsony, Raffaella Margutti, Mitchell C. Begelman

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

76 Scopus citations

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.

Original languageEnglish (US)
Article number103
JournalAstrophysical Journal
Volume765
Issue number2
DOIs
StatePublished - Mar 10 2013

Keywords

  • gamma-ray burst: general
  • hydrodynamics
  • methods: numerical
  • relativistic processes

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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