Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-02-08
Astrophys.J. 578 (2002) 304-309
Astronomy and Astrophysics
Astrophysics
7 pages, 6 figures, submitted to ApJ, added references
Scientific paper
10.1086/342467
We show that the source population of long gamma-ray bursts (GRBs) has declined by at least a factor of 12 (at the 90% confidence level) since the early stages of the Universe ($z \sim 2 - 3$). This result has been obtained using the combined BATSE and \it Ulysses \rm GRB brightness distribution and the detection of four GRBs with known redshifts brighter than 10$^{52}$ erg s$^{-1}$ in the 50 - 300 keV range at their peak. The data indicate that the decline of the GRB source population is as fast as, or even faster than, the measured decline of the star formation rate. Models for the evolution of neutron star binaries predict a significantly larger number of apparently bright GRBs than observed. Thus our results give independent support to the hypernova model, which naturally explains the fast decline in the progenitor population.
Atteia Jean-Luc
Hurley Kevein
Stern Boris E.
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