Neutron star mergers in and out of globular clusters

Neutron stars become the most massive component in globular clusters in less than 2 Gyr. The dynamical friction brings large fraction of neutron stars into the central parts in relative short time scale. Neutron star binaries can be formed by three-body processes in dense nuclei of globular clusters, and they are eventually pumped out of the cluster through the interactions with single stars. Some of the ejected binaries will undergo mergers well within the Hubble time. Since the merger of neutron star pair could release large amount of radiation in short time scale, they can be observed at large distances. We estimate that more than 10(4) neutron star merger may have taken place during last Hubble time in our Galaxy.