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Compact Binaries Ejected from Globular Clusters as GW Sources | | Yeong-Bok Bae
; Chunglee Kim
; Hyung Mok Lee
; | | Date: |
7 Aug 2013 | | Abstract: | Performing N-body simulations, we examine the dynamics of BH-BH (10 Msun
each) and NS-NS (1.4 Msun each) binaries formed in a cluster and its
implications for gravitational wave detection. A significant fraction of
compact binaries are ejected from a globular cluster after core collapse. Among
the total number of ejected compact objects, 30 per cent of them are in
binaries. Merging time-scales of ejected binaries, which depend on the
cluster’s velocity dispersion, are in some cases shorter than the age of the
universe. During the merging event, these dynamically formed compact mergers
are expected to produce gravitational waves that can be detectable by the
advanced ground-based interferometers. Based on our reference assumptions,
merger rates of ejected BH-BH and NS-NS binaries per globular cluster are
estimated to be 2.5 and 0.27 per Gyr, respectively. Assuming the spatial
density of globular clusters to be 8.4 h^3 clusters Mpc^-3 and extrapolating
the merger rate estimates to the horizon distance of the advanced LIGO-Virgo
network, we expect the detection rates for BH-BH and NS-NS binaries with
cluster origin are to be 15 and 0.024 yr^-1, respectively. We find out that
some of the dynamically formed binaries are ejected with a large escape
velocity. They can be responsible for short gamma-ray bursts whose locations
are far from host galaxies. | | Source: | arXiv, 1308.1641 | | Services: | Forum | Review | PDF | Favorites | |
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