Astrophysics and Space Science

, Volume 231, Issue 1–2, pp 389–392 | Cite as

Cosmological rates of coalescing neutron stars and GRB

  • H. Jorgensen
  • V. M. Lipunov
  • I. E. Panchenko
  • K. A. Postnov
  • M. E. Prokhorov
Session F Where are the GRBs?

Abstract

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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Copyright information

© Kluwer Academic Publishers 1995

Authors and Affiliations

  • H. Jorgensen
    • 1
  • V. M. Lipunov
    • 2
  • I. E. Panchenko
    • 2
  • K. A. Postnov
    • 2
  • M. E. Prokhorov
    • 2
  1. 1.Astronomical ObservatoryCopenhagenDenmark
  2. 2.Sternberg Astronomical InstituteMoscowRussia

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