Other
Scientific paper
Jul 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002hst..prop.9513t&link_type=abstract
HST Proposal ID #9513
Other
Hst Proposal Id #9513 Galaxies
Scientific paper
We propose to investigate two dynamical problems associated with black holes in galaxy centers. {1} The nucleus of the nearby galaxy M31 hosts a massive dark object, probably a black hole, of mass 3*10^7Msun. The M31 nucleus is binary, as are the nuclei of other galaxies such as NGC 4486B. It is likely that these ``binary'' nuclei actually consist of a high-inclination stellar disk or ring, whose ansae appear double at low resolution. We shall construct a dynamical model of the nucleus of M31, which can be fit to two-dimensional HST photometry and extensive HST and ground-based spectroscopic measurements of the kinematics. The code can also be used to model other disks found by HST in galaxy centers. {2} Mergers of galaxies containing black holes lead to the formation of binary black holes. The detection of such objects would probe the galaxy formation and evolution process, and could reveal unique new physical phenomena. However, there is considerable uncertainty whether binary black holes can survive the dissipative processes {mainly dynamical friction and gravitational radiation} that lead to their orbital decay. We shall model the evolution of binary black holes in an HST- selected sample of nearby galaxies, including the critical effects of oblateness and triaxiality on the rate of refilling the loss cone, and predict how the properties of surviving binary black holes depend on their host galaxies.
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