Supermassive black hole merger rates: uncertainties from halo merger theory
The merger of two supermassive black holes is expected to produce a gravitational-wave signal detectable by the Laser Interferometer Space Antenna(LISA). The rate of supermassive-black-hole mergers is intimately connected to the halo merger rate, and the extended Press-Schechter (EPS) formalism is often employed when calculating the rate at which these events will be observed by LISA. This merger theory is flawed and provides two rates for the merging of the same pair of haloes. We show that the two predictions for the LISA supermassive-black-hole-merger event rate from EPS merger theory are nearly equal because mergers between haloes of similar masses dominate the event rate. An alternative merger rate may be obtained by inverting the Smoluchowski coagulation equation to find the merger rate that preserves the Press–Schechter halo abundance, but these rates are only available for power-law power spectra. We compare the LISA event rates derived from the EPS merger formalism to those derived from the merger rates obtained from the coagulation equation and find that the EPS LISA event rates are 30 per cent higher for a power spectrum spectral index that approximates the full Λ cold dark matter result of the EPS theory.
Additional Information© 2006 The Authors. Journal compilation © 2006 RAS. Accepted 2006 July 19. Received 2006 June 27; in original form 2006 April 13. Article first published online: 30 Aug. 2006. We thank Jonathan Pritchard for useful discussions. ALE is supported by a NSF Graduate Fellowship. AJB is supported by a Royal Society University Research Fellowship. This work was supported at Caltech by DoE DE-FG03-92ER40701 and NASA NNG05GF69G.
Published - ERImnras06.pdf