2008MNRAS.383.1619B -
Mon. Not. R. Astron. Soc., 383, 1619-1638 (2008/February-1)
Regular black hole motion and stellar orbital resonances.
BOILY C.M., PADMANABHAN T. and PAIEMENT A.
Abstract (from CDS):
The motion of a black hole about the centre of gravity of its host galaxy induces a strong response from the surrounding stellar population. We treat the case of a harmonic potential analytically and show that half of the stars on circular orbits in that potential shift to an orbit of lower energy, while the other half receive a positive boost and recede to a larger radius. The black hole itself remains on an orbit of fixed amplitude and merely acts as a catalyst for the evolution of the stellar energy distribution function f(E). We show that this effect is operative out to a radius of approximately three to four times the hole's influence radius, Rbh. We use numerical integration to explore more fully the response of a stellar distribution to black hole motion. We consider orbits in a logarithmic potential and compare the response of stars on circular orbits, to the situation of a `warm' and `hot' (isotropic) stellar velocity field. While features seen in density maps are now wiped out, the kinematic signature of black hole motion still imprints the stellar line-of-sight mean velocity to a magnitude ≃13 per cent the local rms velocity dispersion σ. A study in three dimensions suggests a reduced effect for polar orbits.
Abstract Copyright:
2007 The Authors. Journal compilation © 2007 RAS
Journal keyword(s):
gravitation - stellar dynamics - Galaxy: centre - galaxies: nuclei
Simbad objects:
6
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