Gamma-ray bursts

Multiwaveband spectral predictions for blast wave models

Peter Istvan Meszaros, M. J. Rees

Research output: Contribution to journalArticle

98 Citations (Scopus)

Abstract

In almost any scenario for "cosmological " gamma-ray bursts (and in many models where they originate in our own Galaxy), the initial energy density is so large that the resulting relativistic plasma expands with υ ∼ c producing a blast wave ahead of it and a reverse shock moving into the ejecta, as it ploughs into the external medium. We evaluate the radiation expected from these shocks, for both cosmological and galactic bursts, for various assumptions about the strength of the magnetic field and the particle acceleration mechanisms in the shocks. The spectra are evaluated over the whole range from the IR to greater than GeV, and are compared with the variety of spectral behavior reported by BATSE, and with the X-ray and optical constraints. For bursts of duration ≳gt; 1 s acceptable γ-ray spectra and Lx/Lγ ratios are readily obtained for " cosmological " models. Blast waves in galactic models can produce bursts of similar gamma-ray fluence and duration, but they violate the X-ray paucity constraint, except for the shorter bursts ( ≲ 1 s). We discuss the prospects for using O/UV and X-ray observations to discriminate among alternative models.

Original languageEnglish (US)
JournalAstrophysical Journal
Volume418
Issue number2 PART 2
DOIs
StatePublished - Dec 1 1993

Fingerprint

blasts
gamma ray bursts
bursts
shock
prediction
predictions
plows
relativistic plasmas
x rays
particle acceleration
ejecta
rays
fluence
flux density
gamma rays
galaxies
magnetic field
plasma
radiation
magnetic fields

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Meszaros, Peter Istvan ; Rees, M. J. / Gamma-ray bursts : Multiwaveband spectral predictions for blast wave models. In: Astrophysical Journal. 1993 ; Vol. 418, No. 2 PART 2.
@article{ecc28627608b49dbb27acf66f1a648db,
title = "Gamma-ray bursts: Multiwaveband spectral predictions for blast wave models",
abstract = "In almost any scenario for {"}cosmological {"} gamma-ray bursts (and in many models where they originate in our own Galaxy), the initial energy density is so large that the resulting relativistic plasma expands with υ ∼ c producing a blast wave ahead of it and a reverse shock moving into the ejecta, as it ploughs into the external medium. We evaluate the radiation expected from these shocks, for both cosmological and galactic bursts, for various assumptions about the strength of the magnetic field and the particle acceleration mechanisms in the shocks. The spectra are evaluated over the whole range from the IR to greater than GeV, and are compared with the variety of spectral behavior reported by BATSE, and with the X-ray and optical constraints. For bursts of duration ≳gt; 1 s acceptable γ-ray spectra and Lx/Lγ ratios are readily obtained for {"} cosmological {"} models. Blast waves in galactic models can produce bursts of similar gamma-ray fluence and duration, but they violate the X-ray paucity constraint, except for the shorter bursts ( ≲ 1 s). We discuss the prospects for using O/UV and X-ray observations to discriminate among alternative models.",
author = "Meszaros, {Peter Istvan} and Rees, {M. J.}",
year = "1993",
month = "12",
day = "1",
doi = "10.1086/187116",
language = "English (US)",
volume = "418",
journal = "Astrophysical Journal",
issn = "0004-637X",
publisher = "IOP Publishing Ltd.",
number = "2 PART 2",

}

Gamma-ray bursts : Multiwaveband spectral predictions for blast wave models. / Meszaros, Peter Istvan; Rees, M. J.

In: Astrophysical Journal, Vol. 418, No. 2 PART 2, 01.12.1993.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Gamma-ray bursts

T2 - Multiwaveband spectral predictions for blast wave models

AU - Meszaros, Peter Istvan

AU - Rees, M. J.

PY - 1993/12/1

Y1 - 1993/12/1

N2 - In almost any scenario for "cosmological " gamma-ray bursts (and in many models where they originate in our own Galaxy), the initial energy density is so large that the resulting relativistic plasma expands with υ ∼ c producing a blast wave ahead of it and a reverse shock moving into the ejecta, as it ploughs into the external medium. We evaluate the radiation expected from these shocks, for both cosmological and galactic bursts, for various assumptions about the strength of the magnetic field and the particle acceleration mechanisms in the shocks. The spectra are evaluated over the whole range from the IR to greater than GeV, and are compared with the variety of spectral behavior reported by BATSE, and with the X-ray and optical constraints. For bursts of duration ≳gt; 1 s acceptable γ-ray spectra and Lx/Lγ ratios are readily obtained for " cosmological " models. Blast waves in galactic models can produce bursts of similar gamma-ray fluence and duration, but they violate the X-ray paucity constraint, except for the shorter bursts ( ≲ 1 s). We discuss the prospects for using O/UV and X-ray observations to discriminate among alternative models.

AB - In almost any scenario for "cosmological " gamma-ray bursts (and in many models where they originate in our own Galaxy), the initial energy density is so large that the resulting relativistic plasma expands with υ ∼ c producing a blast wave ahead of it and a reverse shock moving into the ejecta, as it ploughs into the external medium. We evaluate the radiation expected from these shocks, for both cosmological and galactic bursts, for various assumptions about the strength of the magnetic field and the particle acceleration mechanisms in the shocks. The spectra are evaluated over the whole range from the IR to greater than GeV, and are compared with the variety of spectral behavior reported by BATSE, and with the X-ray and optical constraints. For bursts of duration ≳gt; 1 s acceptable γ-ray spectra and Lx/Lγ ratios are readily obtained for " cosmological " models. Blast waves in galactic models can produce bursts of similar gamma-ray fluence and duration, but they violate the X-ray paucity constraint, except for the shorter bursts ( ≲ 1 s). We discuss the prospects for using O/UV and X-ray observations to discriminate among alternative models.

UR - http://www.scopus.com/inward/record.url?scp=12044260127&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=12044260127&partnerID=8YFLogxK

U2 - 10.1086/187116

DO - 10.1086/187116

M3 - Article

VL - 418

JO - Astrophysical Journal

JF - Astrophysical Journal

SN - 0004-637X

IS - 2 PART 2

ER -