Preprint typeset using LATEX style emulateapj v. 12/14/05 DETECTION RATE ESTIMATES OF GRAVITY-WAVES EMITTED DURING PARABOLIC ENCOUNTERS OF STELLAR BLACK HOLES IN GLOBULAR CLUSTERS

The rapid advance of gravitational-wave (GW) detector facilities makes it very important to estimate the event rates of possible detection candidates. We consider an additional possibility of GW bursts produced during unbound orbits of stellar mass compact objects. We estimate the rate of successful detections for spe-cific detectors: the initial Laser Interferometric Gravitational-Wave Observatory (InLIGO), the French-Italian gravitational-wave antenna VIRGO, the near-future Advanced-LIGO (AdLIGO), the space-based Laser Inter-ferometric Space Antenna (LISA), and the Next Generation LISA (NGLISA). The dominant contribution among unbound orbits that have GW frequencies in the sensitive band of the detectors correspond to near-parabolic encounters (PEs) within globular clusters (GCs). Simple GC models are constructed to account for the compact object mass function, mass segregation, number density distribution, and velocity distribution. We calculate encounters both classically and account for general relativistic corrections by extrapolating the results for infi-nite mass ratios. We also include the cosmological redshift of waveforms and event rates. We find that typical PEs with masses m1 = m2 = 40M ¯ are detectable with matched filtering over a signal to noise ratio S/N = 5 within a distance dL ∼ 200Mpc for InLIGO and VIRGO, z = 1 for AdLIGO, 0.4Mpc for LISA, and 1Gpc for NGLISA. We estimate single datastream detection rates of 5.5 × 10−5 yr−1 for InLIGO, 7.2 × 10−5 yr−1 fo