Issue |
A&A
Volume 435, Number 2, May IV 2005
|
|
---|---|---|
Page(s) | 421 - 426 | |
Section | Cosmology (including clusters of galaxies) | |
DOI | https://doi.org/10.1051/0004-6361:20041702 | |
Published online | 29 April 2005 |
The luminosity and redshift distributions of short-duration GRBs
1
Osservatorio astronomico di Roma, v. Frascati 33, 00040 Monte Porzio Catone, Italy e-mail: dafne@arcetri.astro.it
2
Racah Institute for Physics, The Hebrew University, Jerusalem 91904, Israel e-mail: tsvi@tapir.caltech.edu
Received:
21
July
2004
Accepted:
22
December
2004
Using the BATSE peak flux distribution we rederive the
short GRBs luminosity function and compare it with the observed
redshift distribution of long bursts. We show that both
distributions are compatible with the assumption that short as
well as long bursts follow the star formation rate. In this case
the difference between the two observed distributions can be
interpreted as arising mostly from differences in the detector's
sensitivity to long and short bursts, while the local rate of
short bursts is Gpc-3 yr-1. We also
consider the possibility that short GRBs may be associated with
binary neutron star mergers and estimate the effect of the merging
time delay on the luminosity function and redshift distribution.
We find that in this case the local rate of short GRBs is ~
Gpc-3 yr-1. Assuming that all binary merging systems lead to short GRBs, we find a typical jet opening angle of
.
Key words: cosmology: observations / gamma rays: bursts
© ESO, 2005
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