Probing the Cosmic Star Formation History by Brightness Distribution of Gamma-Ray Bursts

Abstract

Brightness distribution of Gamma-Ray Bursts (GRBs) is studied in detail under the assumption that GRB rate is related to cosmic star formation rate. The two populations of the long- and short-duration bursts in the 4B BATSE catalog are analyzed separately. Taking account of current uncertainties in the observational estimate of star formation rate (SFR), we have tried various models of the cosmic star formation history and we find that the SFR evolution in $z$ = 0--1 is strongly constrained by the GRB distribution if the standard candle approximation is valid. The strong SFR evolution by a factor of $\sim$ 15 from $z$ = 0 to 1 inferred from UV observations is too steep to be consistent with the GRB distribution for any distance scale of GRBs. Some possibilities to reconcile this discrepancy are discussed, including the intrinsic luminosity dispersion of GRBs and/or modification of star formation history estimated by UV observations. We argue that SFR increase factor from $z$ = 0 to 1 may be as low as about 4 if we choose different sets of cosmological parameters and/or take account of the evolution of metallicity and dust extinction in the UV data, and this would significantly remedy the discrepancy.

Accepted version by ApJ. Discussion on luminosity dispersion of GRBs is newly added. 30 pages including 16 figures

References in corpus (5)

• The Star Formation History of Field Galaxies
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• Cosmological Gamma-Ray Bursts and Evolution of Galaxies
• Vigorous star formation hidden by dust in a galaxy at $z=1.4$
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