Evolution of the double neutron star merging rate and the cosmological origin of gamma-ray burst sources

Details Evolution of the double neutron star merging rate and the cosmological origin of gamma-ray burst sources Evolution of the double neutron star merging rate and the cosmological origin of gamma-ray burst sources

1995-04-13

arxiv.org/abs/astro-ph/9504045v1

Astrophys.J. 454 (1995) 593

Astronomy and Astrophysics

Astrophysics

13 pages, compressed uuencoded postscript, 6 figures. This paper has been accepted for publication in the Astrophysical Journa

Scientific paper

10.1086/176512

Evolution of the coalescence rate of double neutron stars (NS) and neutron star -- black hole (BH) binaries are computed for model galaxies with different star formation rates. Assuming gamma-ray bursts (GRB) to originate from NS+NS or NS+BH merging in distant galaxies, theoretical logN--logS distributions and tests of gamma-ray bursts (GRB) are calculated for the first time taking the computed merging rates into account. We use a flat cosmological model (Omega=1) with different values of the cosmological constant Lambda and under various assumptions about the star formation history in galaxies. The calculated source evolution predicts a 5-10 times increase of the source statistics at count rates 3-10 times lower than the exising BATSE sensitivity limit. The most important parameter in fitting the 2nd BATSE catalogue is the initial redshift of star formation, which is found to be z_*=2-5 depending on a poorly determined average spectral index of GRB.

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