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A Gravitational Wave Map of Nearby Galaxies

In this section we discuss the view of the GW sky above the critical frequency of the transparency of the stochastic background. At these frequencies only rapidly rotating NS can generate periodical GW signal (Thorne, 1988[191]), whereas coalescence  of binary NS and supernova  explosions produce burst-like GW.   No reliable estimates of the number of rapidly rotating NS can be obtained at the moment. However, one can estimate the event rates of supernova explosions and binary NS coalescence by using current observations and theoretical predictions and the observed distribution of matter in the vicinity of our Galaxy. As the closest GW sources are the strongest ones, we will consider Tully's Nearby Galaxy Catalog (Tully, 1988[194]) comprising 2367 galaxies from a sphere of tex2html_wrap_inline894550 Mpc in radius. The luminosities are unknown for 596 of these galaxies, so they cannot be included in the analysis. This catalog is almost complete up to distances of about 30 Mpc (Figure 43).

Mike E. Prokhorov
Sat Feb 22 18:38:13 MSK 1997