Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991aj....102.1343c&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 102, Oct. 1991, p. 1343-1347. Research supported by NSERC.
Astronomy and Astrophysics
Astronomy
25
Chaos, Disk Galaxies, Galactic Bulge, Galactic Nuclei, Stellar Motions, Astronomical Models, Galactic Evolution, Stellar Orbits
Scientific paper
A galaxy model, with a disk halo and a spherical nucleus, is used to study the transition from regular to chaotic motion for stars moving in the r-z plane. Stars with values of angular momentum Lz less than or equal to a critical value Lzc, moving near the galactic plane, are scattered to the halo upon encountering the nuclear region, and subsequently display chaotic motion. A linear relationship exists between the critical angular momentum and the mass of the nucleus. Some theoretical arguments are presented to explain this behavior. Similar results are obtained if we use the same model with a spherical bulge instead of a nucleus. A comparison is made between Lzc and the circular angular momentum Lzo at different distances from the center of the galaxy. The results suggest that, for disk galaxies with prominent nuclei, the stars in an associated bulge are in predominantly chaotic orbits.
Caranicolas Nicolaos D.
Innanen Kimmo A.
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