Cosmological Rates of Coalescing Neutron Stars and GRB

Details Cosmological Rates of Coalescing Neutron Stars and GRB Cosmological Rates of Coalescing Neutron Stars and GRB

Sep 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995ap%26ss.231..389j&link_type=abstract

Astrophysics and Space Science, Volume 231, Issue 1-2, pp. 389-392

Astronomy and Astrophysics

Astrophysics

4

Scientific paper

Assuming that gamma-ray bursts (GRB) originate from binary neutron star (NS) or black holes (BH) merging in distant galaxies, theoretical logN-logS distributions for gamma-ray bursts (GRB) are calculated using the compact binaries coalescence rates computed for model galaxies with different star formation histories. A flat cosmological model (Ω = 1) with different values of the cosmological constant Λ is used. The calculated source evolution predicts a 5 10 times increase of the source statistics at count rates 3 10 times lower than the existing BATSE sensitivity limit. The most important parameter in fitting the 2nd BATSE catalogue is the initial redshift of star formation, which is found to bez * = 2 — 5 depending on a poorly determined average spectral index of GRB.

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