Order and chaos in a triaxial galaxy model with a dark halo component

Details Order and chaos in a triaxial galaxy model with a dark halo component Order and chaos in a triaxial galaxy model with a dark halo component

2012-04-10

arxiv.org/abs/1204.2120v1

2012hell.conf...23C

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

10th Hellenic Astronomical Conference, Proceedings of the conference held at Ioannina, Greece, 5-8 September 2011. Edited by I

Scientific paper

We study the regular or chaotic nature of orbits in a 3D potential describing a triaxial galaxy surrounded by a spherical dark halo component. Our numerical calculations show, that the percentage of chaotic orbits decreases exponentially, as the mass of the dark halo increases. A linear increase of the percentage of the chaotic orbits was observed, as the scale length of the dark halo component increases. In order to distinguish between regular and chaotic character of orbits, we use the total angular momentum Ltot, as a new indicator. Comparison of this new dynamical parameter, with other, previously used chaos indicators, shows that the Ltot gives very fast and reliable results in order to detect the character of orbits in galactic potentials.

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