Compact remnants on orbits with peri‐apses close to the Schwarzschild radius of a massive black hole (MBH) lose orbital energy by emitting gravitational waves (GWs) and spiral in. Scattering with other stars allows successful inspiral of such extreme mass ratio inspiral sources (EMRIs) only within small distances, a < few × 0.01 pc from the MBH. The event rate of EMRIs is therefore dominated by the stellar dynamics and content in the inner few × 0.01 pc. I discuss the relevant dynamical aspects and resulting estimated event rates of EMRIs. Subjects considered include the loss‐cone treatment of inspiral sources; mass segregation; resonant relaxation; and alternative routes to EMRI formation such as tidal binary disruptions, stellar formation in disks and tidal capture of massive main sequence stars. The EMRI event rate is estimated to be of order few × 102 Gyr−1 per MBH, giving excellent prospects for observation by LISA.
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29 November 2006
LASER INTERFEROMETER SPACE ANTENNA: 6th International LISA Symposium
19-23 June 2006
Greenbelt, Maryland (USA)
Research Article|
November 29 2006
Astrophysics of extreme mass ratio inspiral sources
Clovis Hopman
Clovis Hopman
Faculty of Physics, Weizmann Institute of Science, POB 26, Rehovot 76100, Israel
Leiden Observatory, P.O. Box 9513, NL‐2300 RA Leiden
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AIP Conf. Proc. 873, 241–249 (2006)
Citation
Clovis Hopman; Astrophysics of extreme mass ratio inspiral sources. AIP Conf. Proc. 29 November 2006; 873 (1): 241–249. https://doi.org/10.1063/1.2405050
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