Astronomy and Astrophysics – Astrophysics – Galaxy Astrophysics
Scientific paper
2012-04-05
Research in Astronomy and Astrophysics (RAA), 2011, vol. 11(12), 1449-1456
Astronomy and Astrophysics
Astrophysics
Galaxy Astrophysics
Published in Research in Astronomy and Astrophysics (RAA) journal
Scientific paper
10.1088/1674-4527/11/12/006
We study the transition from regular to chaotic motion in a prolate elliptical galaxy dynamical model with a bulge and a dense nucleus. Our numerical investigation shows that stars with angular momentum Lz less than or equal to a critical value Lzc, moving near the galactic plane, are scattered to higher z, when reaching the central region of the galaxy, thus displaying chaotic motion. An inverse square law relationship was found to exist between the radius of the bulge and the critical value Lzc of the angular momentum. On the other hand, a linear relationship exists between the mass of the nucleus and Lzc. The numerically obtained results are explained using theoretical arguments. Our study shows that there are connections between regular or chaotic motion and the physical parameters of the system, such as the star's angular momentum and mass, the scale length of the nucleus and the radius of the bulge. The results are compared with the outcomes of previous work.
Caranicolas Nicolaos D.
Zotos Euaggelos E.
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