Gamma photometric redshifts for long gamma-ray bursts

Z. Bagoly, I. Csabai, A. Mészáros, P. Mészáros, I. Horváth, L. Balázs, R. Vavrek

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

It is known that the soft tail of the gamma-ray bursts' spectra show excesses from the exact power-law dependence. In this article we show that this departure can be detected in the peak flux ratios of different BATSE DISCSC energy channels. This effect allows to estimate the redshift of the bright long gamma-ray bursts in the BATSE Catalog. A verification of these redshifts is obtained for the 8 GRB which have both BATSE DISCSC data and measured optical spectroscopic redshifts. There is good correlation between the measured and estimated redshifts, and the average error is Δz ≈ 0.33. The method is similar to the photometric redshift estimation of galaxies in the optical range, hence it can be called as "gamma photometric redshift estimation". The estimated redshifts for the long bright gamma-ray bursts are up to z ≃ 4. For the the faint long bursts - which should be up to z ≃ 20 - the redshifts cannot be determined unambiguously with this method.

Original languageEnglish
Pages (from-to)919-925
Number of pages7
JournalAstronomy and Astrophysics
Volume398
Issue number3
Publication statusPublished - Feb 2003

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gamma ray bursts
power law
catalogs
bursts
galaxies
energy
estimates
method
effect

Keywords

  • Cosmology: large-scale structure of Universe
  • Gamma-rays: bursts

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

Gamma photometric redshifts for long gamma-ray bursts. / Bagoly, Z.; Csabai, I.; Mészáros, A.; Mészáros, P.; Horváth, I.; Balázs, L.; Vavrek, R.

In: Astronomy and Astrophysics, Vol. 398, No. 3, 02.2003, p. 919-925.

Research output: Contribution to journalArticle

Bagoly, Z, Csabai, I, Mészáros, A, Mészáros, P, Horváth, I, Balázs, L & Vavrek, R 2003, 'Gamma photometric redshifts for long gamma-ray bursts', Astronomy and Astrophysics, vol. 398, no. 3, pp. 919-925.
Bagoly, Z. ; Csabai, I. ; Mészáros, A. ; Mészáros, P. ; Horváth, I. ; Balázs, L. ; Vavrek, R. / Gamma photometric redshifts for long gamma-ray bursts. In: Astronomy and Astrophysics. 2003 ; Vol. 398, No. 3. pp. 919-925.
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AU - Balázs, L.

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