Other
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004ragt.meet..271s&link_type=abstract
In Proceedings of RAGtime 4/5 Workshops on black holes and neutron stars, 14-16/13-15 October 2002/2003, Eds: S. Hledík and Z. S
Other
Scientific paper
We further examine orbits of satellite stars in the gravitational field of a dark super-massive compact body, which is surrounded by a self-gravitating accretion disc or a massive molecular torus. The disc extends to several hundred gravitational radii from the core and its mass can reach a significant fraction of the central mass, causing a non-negligible perturbation of the orbits. We demonstrate that resonances occur for orbits exhibiting epicyclic and latitudinal oscillations whose periods are in rational ratios. As a result, episodic changes of orbital eccentricity and inclination take place. Some of the satellite stars may populate highly eccentric orbits with an increased chance of being damaged by tidal forces at the moment of their close approach to the central black hole, or they may be even set on an unstable trajectory and captured by the hole. This effect influences the long-term evolution of the system which would otherwise exhibit only very slow orbital decay and gradual sinking of the satellites toward the core. It may be therefore relevant for the structure of an inner cluster residing in galactic nuclei.
Karas Vladimir
Subr Ladislav
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