Gravitational Waves from Compact Objects Accreting onto Active Galactic Nuclei

Details Gravitational Waves from Compact Objects Accreting onto Active Galactic Nuclei Gravitational Waves from Compact Objects Accreting onto Active Galactic Nuclei

2006-08-28

arxiv.org/abs/astro-ph/0608596v1

Astronomy and Astrophysics

Astrophysics

7 pages, to appear in Proceedings of Sixth International LISA Symposium

Scientific paper

10.1063/1.2405081

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.

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