Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008mnras.383.1619b&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 383, Issue 4, pp. 1619-1638.
Astronomy and Astrophysics
Astronomy
3
Gravitation, Stellar Dynamics, Galaxy: Centre, Galaxies: Nuclei
Scientific paper
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.
Boily Christian M.
Padmanabhan Thanu
Paiement A.
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