Orbits in disc galaxies with rapidly rotating massive nuclei: comparison with data from observations
Authors: Papadopoulos, N. J.; Caranicolas, N. D.
Source: Astronomical and Astrophysical Transactions, Volume 24, Number 3, Number 3/June 2005 , pp. 241-252(12)
Publisher: Taylor and Francis Ltd
Abstract:An axially symmetric galactic dynamic model is used, with a disc, a massive nucleus and halo components, in order to reproduce recently obtained observation data in disc galaxies. The model reproduces very well two basic physical quantities, i.e. the high-velocity rotation and the high surface mass density in the central regions of some galaxies such as the galaxy NGC 3079. Going a step further, we investigate the properties of orbits in the model, the behaviour of the velocities of the system and their connections with the value of the conserved L z component of the angular momentum. The regular or chaotic nature of motion is also studied. All the above studies are made in two different cases: firstly, when the model is time independent and, secondly, when the model evolves with time.
Document Type: Research Article
Affiliations: Department of Physics, Section of Astrophysics, Astronomy and Mechanics, University of Thessaloniki, 541 24, Thessaloniki, Greece
Publication date: 2005-06-01