We present an up-to-date, comprehensive summary of the rates for all types of compact binary coalescence sources detectable by the initial and advanced versions of the ground-based gravitational-wave detectors LIGO and Virgo. Astrophysical estimates for compact-binary coalescence rates depend on a number of assumptions and unknown model parameters and are still uncertain. The most confident among these estimates are the rate predictions for coalescing binary neutron stars which are based on extrapolations from observed binary pulsars in our galaxy. These yield a likely coalescence rate of 100 Myr−1 per Milky Way Equivalent Galaxy (MWEG), although the rate could plausibly range from 1 Myr−1 MWEG−1 to 1000 Myr−1 MWEG−1 (Kalogera et al 2004 Astrophys. J. 601 L179; Kalogera et al 2004 Astrophys. J. 614 L137 (erratum)). We convert coalescence rates into detection rates based on data from the LIGO S5 and Virgo VSR2 science runs and projected sensitivities for our advanced detectors. Using the detector sensitivities derived from these data, we find a likely detection rate of 0.02 per year for Initial LIGO–Virgo interferometers, with a plausible range between 2 × 10−4 and 0.2 per year. The likely binary neutron–star detection rate for the Advanced LIGO–Virgo network increases to 40 events per year, with a range between 0.4 and 400 per year.

We present the results of the analysis of the first 9 months of data of the Swift BAT survey of AGNs in the 14Y195 keV band. Using archival X-ray data or follow-up Swift XRT observations, we have identified 129 (103 AGNs) of 130 objects detected at jbj > 15 and with significance >4.8 . One source remains unidentified. These same X-ray data have allowed measurement of the X-ray properties of the objects. We fit a power law to the log N Ylog S distribution, and find the slope to be 1:42 AE 0:14. Characterizing the differential luminosity function data as a broken power law, we find a break luminosity log L Ã (erg s À1 ) = 43.85 AE 0.26, a low-luminosity power law slope a ¼ 0:84 þ0:16 À0:22 , and a highluminosity power law slope b ¼ 2:55 þ0:43 À0:30 , similar to the values that have been reported based on INTEGRAL data. We obtain a mean photon index 1.98 in the 14Y195 keV band, with an rms spread of 0.27. Integration of our luminosity function gives a local volume density of AGNs above 10 41 erg s À1 of 2:4 ; 10 À3 Mpc À3 , which is about 10% of the total luminous local galaxy density above M Ã ¼ À19:75. We have obtained X-ray spectra from the literature and from Swift XRT follow-up observations. These show that the distribution of log n H is essentially flat from n H ¼ 10 20 to1024 cm À2 , with 50% of the objects having column densities of less than 10 22 cm À2 . BAT Seyfert galaxies have a median redshift of 0.03, a maximum log luminosity of 45.1, and approximately half have log n H > 22.

No abstract