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Gravitational-wave background from compact objects embedded in active galactic nuclei accretion disks

G. Sigl 1 J. Schnittman A. Buonanno
1 APC - THEORIE
APC (UMR_7164) - AstroParticule et Cosmologie, Institut für theoretische Physik
Abstract : We consider a model in which massive stars form in a self-gravitating accretion disk around an active galactic nucleus (AGN). 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 intrinsic hard X-ray AGN luminosity function to estimate expected event rates and signal strengths. We find that these sources will produce a continuous low-frequency (<~ mHz) background detectable by LISA if more than 1% of the accreted matter is in the form of compact objects. For compact objects with masses >~ 10 solar masses the last stages of the inspiral events should be resolvable above a few mHz, with rates as high as a few hundred per year.
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Submitted on : Thursday, January 18, 2007 - 4:39:56 PM
Last modification on : Wednesday, October 21, 2020 - 4:32:14 PM

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G. Sigl, J. Schnittman, A. Buonanno. Gravitational-wave background from compact objects embedded in active galactic nuclei accretion disks. Physical Review D, American Physical Society, 2007, 75, pp.024034. ⟨10.1103/PhysRevD.75.024034⟩. ⟨in2p3-00125265⟩

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