Observations of GRBs at High Redshift

Details Observations of GRBs at High Redshift Observations of GRBs at High Redshift

2007-01-26

arxiv.org/abs/astro-ph/0701777v1

Astronomy and Astrophysics

Astrophysics

8 pages, 2 figures. Proceedings of the Royal Society Discussion meeting on Gamma-ray Bursts, September 18-20, 2006. To appear

Scientific paper

10.1098/rsta.2006.1992

The extreme luminosity of gamma-ray bursts (GRBs) and their afterglows means they are detectable, in principle, to very high redshifts. Although the redshift distribution of GRBs is difficult to determine, due to incompleteness of present samples, we argue that for Swift-detected bursts the median redshift is between 2.5 and 3, with a few percent likely at z > 6. Thus, GRBs are potentially powerful probes of the era of reionization, and the sources responsible for it. Moreover, it seems likely that they can provide constraints on the star formation history of the universe, and may also help in the determination of the cosmological parameters.

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