Volume 399, Number 3, March I 2003
|Page(s)||957 - 960|
|Section||Galactic structure, stellar clusters, and populations|
|Published online||14 February 2003|
Chaotic orbits in a galaxy model with a massive nucleus
Department of Physics, Section of Astrophysics, Astronomy and Mechanics, University of Thessaloniki, 540 06 Thessaloniki, Greece
Corresponding author: N. D. Caranicolas, email@example.com
Accepted: 15 November 2002
The transition from regular to chaotic motion is studied in an axially symmetric galaxy model with a disk-halo and a spherical nucleus. This model has the characteristic that the mass of the nucleus increases exponentially, because mass is transported from the disk to the nucleus while the total mass of the galaxy remains constant. Stars with values of angular momentum Lz less or equal to a critical value , moving near the galactic plane, are scattered to the halo when approaching the nucleus. The corresponding orbits are chaotic. A linear relationship is found to exist between the critical angular momentum and the final mass of the nucleus Mnf. Our results suggest that the stars in the central regions of disk galaxies with massive nuclei must be in chaotic orbits. Comparison with previous work is also made.
Key words: galaxies: kinematics and dynamics
© ESO, 2003
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