The Star Formation Rate in the Reionization Era as Indicated by Gamma-ray Bursts

Details The Star Formation Rate in the Reionization Era as Indicated by Gamma-ray Bursts The Star Formation Rate in the Reionization Era as Indicated by Gamma-ray Bursts

2009-06-02

arxiv.org/abs/0906.0590v2

Astrophys.J.705:L104-L108,2009

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

4 pages, 4 figures; modified to match version accepted for publication in ApJ Letters

Scientific paper

10.1088/0004-637X/705/2/L104

High-redshift gamma-ray bursts (GRBs) offer an extraordinary opportunity to study aspects of the early Universe, including the cosmic star formation rate (SFR). Motivated by the two recent highest-z GRBs, GRB 080913 at z = 6.7 and GRB 090423 at z = 8.1, and more than four years of Swift observations, we first confirm that the GRB rate does not trace the SFR in an unbiased way. Correcting for this, we find that the implied SFR to beyond z = 8 is consistent with LBG-based measurements after accounting for unseen galaxies at the faint end of the UV luminosity function. We show that this provides support for the integrated star formation in the range 6 < z < 8 to have been alone sufficient to reionize the Universe.

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