Other
Scientific paper
Oct 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aipc..686..191w&link_type=abstract
THE ASTROPHYSICS OF GRAVITATIONAL WAVE SOURCES. AIP Conference Proceedings, Volume 686, pp. 191-200 (2003).
Other
Wave Generation And Sources, Black Holes, Cataclysmic Binaries, Symbiotic Stars, Gravitational Radiation, Magnetic Fields, And Other Observations
Scientific paper
Recent observational evidence ties the mass of supermassive black-holes to the circular velocities of their host dark-matter halos, and suggests that this relation is independent of redshift. We show that a simple model including the combination of the black-hole - circular velocity relation with the dark matter halo mass function and merger rate reproduces the details of the optical and X-ray quasar luminosity functions at high redshift within a standard Lambda-CDM cosmology. A similar approach can be used to estimate the expected rate of gravitational wave emission from merging super-massive black-holes. These calculations suggest an event rate for the LISA satellite that may be as high as one hundred per year unless most super-massive black-hole binaries have hardening timescales longer than a Hubble time. We discuss the effect of reionization on the redshift distribution of gravitational wave sources and show that most sources for LISA may come from z>6. Finally we find that the nHz frequency back-ground is dominated by black-hole binaries at z<2, and that pulsar timing experiments are already nearing the level where limits may be placed on the fraction of black-hole binaries that achieve coalescence.
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