Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-11-01
Astronomy and Astrophysics
Astrophysics
15 pages, 7 figures (1 color). Accepted for publication in ApJ
Scientific paper
10.1086/338683
We use numerical simulations to study the evolution of triaxial elliptical galaxies with central black holes. In contrast to earlier numerical studies which used galaxy models with central density ``cores,'' our galaxies have steep central cusps, like those observed in real ellipticals. As a black hole grows in these cuspy triaxial galaxies, the inner regions become rounder owing to chaos induced in the orbit families which populate the model. At larger radii, however, the models maintain their triaxiality, and orbital analyses show that centrophilic orbits there resist stochasticity over many dynamical times. While black hole induced evolution is strong in the inner regions of these galaxies, and reaches out beyond the nominal ``sphere of influence'' of a black hole, our simulations do not show evidence for a rapid {\it global} transformation of the host. The triaxiality of observed elliptical galaxies is therefore not inconsistent with the presence of supermassive black holes at their centers.
Hernquist Lars
Holley-Bockelmann Kelly
Mihos James Christopher
Norman Colin
Sigurdsson Steinn
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