Reconciliation of the disparate gamma-ray burst catalogs in the context of a cosmological source distribution

Peter Tamblyn, Fulvio Melia

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

It is well-known that gamma-ray burst spectra often display a break at energies ≲400 keV, with some exceptions extending to several MeV. Modeling of a cosmological source population is thus nontrivial when comparing the catalogs from instruments with different energy windows since this spectral structure is redshifted across the trigger channels at varying levels of sensitivity. We here include this important effect in an attempt to reconcile all the available data sets and show that a model in which bursts have a "standard" spectral break at 300 keV and occur in a population uniformly distributed in a q0 = 1/2 universe with no evolution can account very well for the combined set of observations. We show that the source population cannot be truncated at a minimum redshift zmin beyond ∼0.1, and suggest that a simple follow-on instrument to BATSE, with the same trigger window, no directionality and 18 times better sensitivity might be able to distinguish between a q0 = 0.1 and a q0 = 0.5 universe in 3 years of full sky coverage, provided the source population has no luminosity evolution.

Original languageEnglish (US)
JournalAstrophysical Journal
Volume417
Issue number1 PART 2
StatePublished - Nov 1 1993

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gamma ray bursts
catalogs
energy
universe
actuators
sensitivity
modeling
sky
bursts
luminosity
distribution
effect

Keywords

  • Cosmology: observations
  • Cosmology: theory
  • Galaxies: clustering
  • Galaxies: evolution
  • Gamma rays: bursts
  • Pulsars: general

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

Reconciliation of the disparate gamma-ray burst catalogs in the context of a cosmological source distribution. / Tamblyn, Peter; Melia, Fulvio.

In: Astrophysical Journal, Vol. 417, No. 1 PART 2, 01.11.1993.

Research output: Contribution to journalArticle

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N2 - It is well-known that gamma-ray burst spectra often display a break at energies ≲400 keV, with some exceptions extending to several MeV. Modeling of a cosmological source population is thus nontrivial when comparing the catalogs from instruments with different energy windows since this spectral structure is redshifted across the trigger channels at varying levels of sensitivity. We here include this important effect in an attempt to reconcile all the available data sets and show that a model in which bursts have a "standard" spectral break at 300 keV and occur in a population uniformly distributed in a q0 = 1/2 universe with no evolution can account very well for the combined set of observations. We show that the source population cannot be truncated at a minimum redshift zmin beyond ∼0.1, and suggest that a simple follow-on instrument to BATSE, with the same trigger window, no directionality and 18 times better sensitivity might be able to distinguish between a q0 = 0.1 and a q0 = 0.5 universe in 3 years of full sky coverage, provided the source population has no luminosity evolution.

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