Spectral properties of blast-wave models of gamma-ray burst sources

Peter Istvan Meszaros, M. J. Rees, H. Papathanassiou

Research output: Contribution to journalArticle

185 Citations (Scopus)

Abstract

We calculate the spectrum of blast-wave models of gamma-ray burst sources, for various assumptions about the magnetic field density and the relativistic particle acceleration efficiency. For a range of physically plausible models we find that the radiation efficiency is high and leads to nonthermal spectra with breaks at various energies comparable to those observed in the gamma-ray range. Radiation is also predicted at other wavebands, in particular at X-ray, optical/UV, and GeV/TeV energies. We discuss the spectra as a function of duration for three basic types of models, and for cosmological, halo, and galactic disk distances. We also evaluate the gamma-ray fluences and the spectral characteristics for a range of external densities. Impulsive burst models at cosmological distances can satisfy the conventional X-ray paucity constraint Sx/Sy less than a few percent over a wide range of durations, but galactic models can do so only for bursts shorter than a few seconds, unless additional assumptions are made. The emissivity is generally larger for bursts in a denser external environment, with the efficiency increasing up to the point where all the energy input is radiated away.

Original languageEnglish (US)
Pages (from-to)181-193
Number of pages13
JournalAstrophysical Journal
Volume432
Issue number1
StatePublished - Sep 1 1994

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blasts
gamma ray bursts
bursts
gamma rays
energy
relativistic particles
particle acceleration
radiation
emissivity
halos
fluence
x rays
magnetic field
magnetic fields

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Meszaros, P. I., Rees, M. J., & Papathanassiou, H. (1994). Spectral properties of blast-wave models of gamma-ray burst sources. Astrophysical Journal, 432(1), 181-193.
Meszaros, Peter Istvan ; Rees, M. J. ; Papathanassiou, H. / Spectral properties of blast-wave models of gamma-ray burst sources. In: Astrophysical Journal. 1994 ; Vol. 432, No. 1. pp. 181-193.
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Meszaros, PI, Rees, MJ & Papathanassiou, H 1994, 'Spectral properties of blast-wave models of gamma-ray burst sources', Astrophysical Journal, vol. 432, no. 1, pp. 181-193.

Spectral properties of blast-wave models of gamma-ray burst sources. / Meszaros, Peter Istvan; Rees, M. J.; Papathanassiou, H.

In: Astrophysical Journal, Vol. 432, No. 1, 01.09.1994, p. 181-193.

Research output: Contribution to journalArticle

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Meszaros PI, Rees MJ, Papathanassiou H. Spectral properties of blast-wave models of gamma-ray burst sources. Astrophysical Journal. 1994 Sep 1;432(1):181-193.