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Conference Paper

Gravitational Waves from Compact Objects Accreting onto Active Galactic Nuclei


Buonanno,  Alessandra
Physics Department, University of Maryland;
Astrophysical and Cosmological Relativity, AEI-Golm, MPI for Gravitational Physics, Max Planck Society;

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Schnittman, J. D., Sigl, G., & Buonanno, A. (2006). Gravitational Waves from Compact Objects Accreting onto Active Galactic Nuclei. In AIP Conference Proceedings.

Cite as: http://hdl.handle.net/11858/00-001M-0000-0019-DCA3-6
We consider a model in which massive stars form in a self-gravitating accretion disk around an active galactic nucleus. These stars may evolve and collapse to form compact objects on a time scale shorter than the accretion time, thus producing an important family of sources for LISA. Assuming the compact object formation/inspiral rate is proportional to the steady-state gas accretion rate, we use the observed extra-galactic X-ray luminosity function to estimate expected event rates and signal strengths. We find that these sources will produce a continuous low-frequency background detectable by LISA if more than >~ 1% of the accreted matter is in the form of compact objects. For compact objects with m >~ 10 Msun, the last stages of the inspiral events should be resolvable above a few mHz, at a rate of ~10-100 per year.