Physics
Scientific paper
Aug 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007jena.confe..58b&link_type=abstract
"JENAM-2007, "Our non-stable Universe", held 20-25 August 2007 in Yerevan, Armenia. Abstract book, p. 58-58"
Physics
Scientific paper
In the late 1980s, Hills predicted that runaway stars could be accelerated to high velocities by dynamical encounters with the supermassive black hole (SMBH) in the galactic centre, and the recently discovered hyper-velocity stars (HVS) in the galactic halo could be the first examples for such objects. At present two mechanisms are considered capable of creating hyper-velocity stars: Encounters of stellar binaries with an SMBH and the acceleration of single stars by an intermediate-mass black hole (IMBH) orbiting the SMBH. In order to test which scenario is operating in our galaxy, we performed a series of N-body simulations modeling the encounter of single stars with an IMBH. Our runs consisted of 10^5 stars distributed in a stellar cusp around a central SMBH of 3 10^6 Msun and IMBHs of varying mass. We found that IMBHs sink towards the SMBH due to dynamical friction and eject hypervelocity stars in short bursts lasting for a few Myrs between the time an IMBH reaches the galactic centre and the time the IMBH merges with the SMBH by gravitational wave emission. This makes it possible to test the origin of HVS once enough of them have been found.
Baumgardt Holger
Loeckmann Ulf
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