Query : 1998A&A...332L..57B

1998A&A...332L..57B - Astronomy and Astrophysics, volume 332, L57-60 (1998/4-3)

Gamma-ray bursts and density evolution of neutron star binary mergers.


Abstract (from CDS):

The evolution of the comoving cosmic merger-rate density of neutron star binaries nc(z) is calculated using a distribution of their merging times provided by population-synthesis computations of binary stars. We adopt an exponential law for the star formation rate with various timescales for different morphological types of galaxies. For elliptical galaxies also an initial burst of star formation, lasting one Gyr, is considered. The resulting nc(z) of most models agree with the form nc(z)∝(1+z)1.5–2 for z≲2, which has been proposed for the source population of γ-ray bursts. Assuming a standard candle luminosity, the computed brightness distribution is consistent with the BATSE results if bursts at the peak flux threshold, P=0.4 photons/cm2/s, are located at a limiting redshift of 1.9 to 3.3. Progenitors of the systems producing γ-ray bursts at small redshift (bright) are likely to host in spiral galaxies and star forming regions whereas these at high redshift (dim) reside mainly in elliptical galaxies. The location of a burst may be up to ∼1Mpc away from the host galaxy.

Abstract Copyright:

Journal keyword(s): stars: binaries - stars: evolution - stars: neutron - cosmology: theory - gamma rays: bursts - gamma rays: theory

Simbad objects: 2

goto View the references in ADS

Number of rows : 2
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
1 GRB 970228 gB 05 01 46.7 +11 46 53           ~ 630 1
2 GRB 970508 gB 06 53 49.2 +79 16 19           ~ 854 1

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