Astronomy and Astrophysics – Astrophysics – Galaxy Astrophysics
Scientific paper
2012-04-03
Astronomische Nachrichten, 2010, vol. 331(3), 330-337
Astronomy and Astrophysics
Astrophysics
Galaxy Astrophysics
Published in Astronomische Nachrichten journal
Scientific paper
10.1002/asna.200911302
The evolution of chaotic motion in a galactic dynamical model with a disk, a dense nucleus and a flat biaxial dark halo component is investigated. Two cases are studied: (i) the case where the halo component is oblate and (ii) the case where a prolate halo is present. In both cases, numerical calculations show that the extent of the chaotic regions decreases exponentially as the scale-length of the dark halo increases. On the other hand, a linear relationship exists between the extent of the chaotic regions and the flatness parameter of the halo component. A linear relationship between the critical value of the angular momentum and the flatness parameter is also found. Some theoretical arguments to support the numerical outcomes are presented. An estimation of the degree of chaos is made by computing the Lyapunov Characteristic Exponents. Comparison with earlier work is also made.
Caranicolas Nicolaos D.
Zotos Euaggelos E.
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