Chaos and Elliptical Galaxies

Details Chaos and Elliptical Galaxies Chaos and Elliptical Galaxies

1995-10-17

arxiv.org/abs/astro-ph/9510087v1

Astronomy and Astrophysics

Astrophysics

uuencoded gziped PostScript, 12 pages including figures

Scientific paper

10.1007/BF00051605

Recent results on chaos in triaxial galaxy models are reviewed. Central mass concentrations like those observed in early-type galaxies -- either stellar cusps, or massive black holes -- render most of the box orbits in a triaxial potential stochastic. Typical Liapunov times are 3-5 crossing times, and ensembles of stochastic orbits undergo mixing on time scales that are roughly an order of magnitude longer. The replacement of the regular orbits by stochastic orbits reduces the freedom to construct self-consistent equilibria, and strong triaxiality can be ruled out for galaxies with sufficiently high central mass concentrations.

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