Paper: astro-ph/0510727
Date: Wed, 26 Oct 2005 02:02:24 GMT (74kb)

Title: Expected coalescence rates of NS-NS binaries for laser beam
interferometers

Authors: J. A. de Freitas Pacheco, T. Regimbau, S. Vincent and A. Spallicci

Comments: 15 pages, 3 figures accepted for publication in IJMPD
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The coalescence rate of two neutron stars (NS) is revisited. For estimation
of the number of bound NS-NS and the probability of their coalescence in a
timescale $\tau$, the galactic star formation history, directly derived from
observations, and the evolution of massive stars are considered. The newly
established galactic merging rate is $(1.7\pm 1.0) \times 10^{-5} yr^{-1}$,
while the local merging rate, including the contribution of elliptical
galaxies, is about a factor of two higher, $3.4 \times 10^{-5} yr^{-1}$. Using
the present data basis on galaxy distribution in the local universe and the
expected sensitivity of the first generation of laser beam interferometers, we
estimate that one event should occur every 125 years for LIGO and one event
each 148 years for VIRGO. The situation is considerably improved for
advanced-LIGO since we predict that 6 events per year should be detected
whereas for a recently proposed VIRGO new configuration, the event rate might
increase up to 3 events every two years.

\\ ( http://arXiv.org/abs/astro-ph/0510727 , 74kb)