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Using a population synthesis approach, we compute the total merger rate inthe local Universe for double neutron stars, double black holes, and black hole-- neutron star binaries. These compact binaries are the prime sourcecandidates for gravitational-wave detection by LIGO and VIRGO. We account formergers originating from field populations and from dense stellar clusters. Forboth populations we use the same treatment of stellar evolution. Our resultsindicate that the merger rates of double neutron stars and black hole --neutron star binaries are strongly dominated by field populations, whilemerging black hole binaries are formed much more effectively in dense stellarclusters. The overall merger rate of double compact objects depends sensitivelyon the (largely unknown) initial mass fraction contained in dense clustersf_cl. For f_cl < 0.0001, the Advanced LIGO detection rate will be dominated byfield populations of double neutron star mergers, with a small but significantnumber of detections ~20 yr^-1. However for a higher mass fraction in clusters,f_cl > 0.001, the detection rate will be dominated by numerous mergers ofdouble black holes originating from dense clusters, and it will be considerablyhigher, ~25 - 300 yr^-1. In addition, we show that, once mergers of doubleblack holes are detected, it is easy to differentiate between systems formed inthe field and in dense clusters, since the chirp mass distributions arestrikingly different. Finally, we point out that there may exist a populationof merging black hole binaries in intergalactic space.

The Total Merger Rate of Compact Object Binaries In The Local Universe