Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-10-29
Astronomy and Astrophysics
Astrophysics
4 pages, 1 figure, talk given at the CAPP2000 Conference on Cosmology and Particle Physics, Verbier, Switzerland, eds. J. Garc
Scientific paper
10.1063/1.1363562
The cosmic gamma-ray burst (GRB) formation rate, as derived from the variability-luminosity relation for long-duration GRBs, is compared with the cosmic star formation rate. If GRBs are related to the collapse of massive stars, one expects the GRB rate to be approximately proportional to the star formation rate. We found that these two rates have similar slopes at low redshift. This suggests that GRBs do indeed track the star formation rate of the Universe, which in turn implies that the formation rate of massive stars that produce GRBs is proportional to the total star formation rate. It also implies that we might be able to use GRBs as a probe of the cosmic star formation rate at high redshift. We find that the cosmic star formation rate inferred from the variability-luminosity relation increases steeply with redshift at z > 3. This is in apparent contrast to what is derived from measurements of the cosmic star formation rate at high redshift from optical observations of field galaxies, suggesting that much high-z star formation is being missed in the optical surveys, even after corrections for dust extinction have been made.
Fenimore Edward E.
Ramirez-Ruiz Enrico
Trentham Neil
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