期刊
ASTROPHYSICAL JOURNAL LETTERS
卷 673, 期 2, 页码 L119-L122出版社
UNIV CHICAGO PRESS
DOI: 10.1086/527671
关键词
cosmology : theory; gamma rays : bursts
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 similar to 4 times as many GRBs observed at than expected from star formation measurements. This direct and empirical demonstration z approximate to 4 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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