Physics
Scientific paper
Aug 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008noao.prop..264m&link_type=abstract
NOAO Proposal ID #2008B-0264
Physics
Scientific paper
Binary supermassive black holes (SBHs) are expected to receive kicks from anisotropically-emitted gravitational waves during their final coalescence. Calculations indicate that the kicks can exceed 1000 km/s, large enough to displace the coalesced SBHs substantially from their usual locations at the centers of galaxies. In addition, N-body simulations show that a kicked SBH can take a long time, as long as a billion years, to return to a zero-velocity state; during this time, the SBH and the stellar nucleus oscillate back and forth about the center of the galaxy. A unique prediction of the 'kick' model is that the SBHs in galaxies with lopsided or offset cores should NOT be located at the peak of stellar light. This hypothesis can be tested by measuring the stellar motions near the centers of these galaxies to see whether or not the peak velocities (which are associated with the SBH) coincide with the peak of the stellar light. Verifying the 'kick' model has important consequences for strong-field relativity theory and for our understanding of nuclear dynamics. We propose the observation of one elliptical galaxy with an offset nucleus (NGC7619) in order to test our technique for investigating the nature of the offset nucleus and to verify if it could be due to a kicked black hole.
Merritt David
Storchi Bergmann Thaisa
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