Redshift distribution of gamma-ray bursts and star formation rate
Astronomical Institute of the Charles University, V Holešovičkách 2, 180 00 Prague 8, Czech Republic e-mail: email@example.com
2 Max Planck Institute for Astrophysics, Garching, Karl-Schwarzschild-Str. 1, Postfach 1317, 85741 Garching, Germany
3 Laboratory for Information Technology, Eötvös University, 1117 Budapest, Pázmány P. s. 1/A, Hungary e-mail: firstname.lastname@example.org
4 Konkoly Observatory, 1525 Budapest, POB 67, Hungary e-mail: email@example.com
5 Department of Physics, Bolyai Military University, 1456 Budapest, POB 12, Hungary e-mail: firstname.lastname@example.org
Accepted: 9 May 2006
Aims.The redshift distribution of gamma-ray bursts collected in the BATSE Catalog is compared with the star formation rate. We aim to clarify the accordance between them. We also study the case of comoving number density of bursts monotonously increasing up to redshift .
Methods.A method independent of the models of the gamma-ray bursts is used. The short and the long subgroups are studied separately.
Results.The redshift distribution of the long bursts may be proportional to the star formation rate. For the short bursts this can also happen, but the proportionality is less evident. For the long bursts the monotonously increasing scenario is also less probable but still can occur. For the short bursts this alternative seems to be excluded.
Key words: gamma rays: bursts / cosmology: miscellaneous
© ESO, 2006