The evolution of chaos in active galaxy models with an oblate or a prolate dark halo component

Abstract

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.

Published in Astronomische Nachrichten journal

References in corpus (1)

• Reconstructing the cosmic density field with the distribution of dark matter halos

Cited by in corpus (5)

• A new dynamical model for the study of galactic structure
• Classifying orbits in galaxy models with a prolate or an oblate dark matter halo component
• Dark halos acting as chaos controllers in asymmetric triaxial galaxy models
• Are external perturbations responsible for chaotic motion in galaxies?
• First measurement of the triaxiality of the inner dark matter halo of the Milky Way