An Unexpectedly Swift Rise in the Gamma-ray Burst Rate

Details An Unexpectedly Swift Rise in the Gamma-ray Burst Rate An Unexpectedly Swift Rise in the Gamma-ray Burst Rate

2007-09-04

arxiv.org/abs/0709.0381v3

Astrophys.J.673:L119-L122,2008

Astronomy and Astrophysics

Astrophysics

4 pages, 4 figures; minor changes to agree with published version

Scientific paper

10.1086/527671

The association of long gamma-ray bursts with supernovae naturally suggests that the cosmic GRB rate should trace the star formation history. Finding otherwise would provide important clues concerning these rare, curious phenomena. Using a new estimate of Swift GRB energetics to construct a sample of 36 luminous GRBs with redshifts in the range z=0-4, we find evidence of enhanced evolution in the GRB rate, with ~4 times as many GRBs observed at z~4 than expected from star formation measurements. This direct and empirical demonstration of needed additional evolution is a new result. It is consistent with theoretical expectations from metallicity effects, but other causes remain possible, and we consider them systematically.

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