2013/11/26 by Euaggelos E. Zotos, N. D. Caranicolas, Nicolaos D. Caranicolas · 16 citations
Physics and Astronomy · #Astronomy #Astrophysics #Circular motion #Classical mechanics #Cosmology and Gravitation Theories #Dark matter #Dark matter halo #Galaxies: Formation, Evolution, Phenomena #Galaxy #Galaxy rotation curve #Halo #Physics #Stellar, planetary, and galactic studies #astro-ph.GA
paper · pdf · doi:10.1051/0004-6361/201322352
published in Astronomy and Astrophysics 560, A110 (EDP Sciences) · Published in Astronomy & Astrophysics (A&A) journal. arXiv admin note: previous paper with related context: arXiv:1309.5607
openalex publication_date 2013/11/26 · arxiv created 2013/12/16 · arxiv updated 2017/09/28 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
An axially symmetric galactic gravitational model composed of a dense, massive and spherical nucleus with an additional dark matter halo component was used to distinguish between the regular and chaotic character of orbits of stars that move in the meridional plane (R,z). We investigated two different cases: (i) a flat-disk galaxy; (ii) an elliptical galaxy. It is of particular interest to reveal how the portion of the dark matter inside the main body of the galaxy influences the ordered or chaotic nature of motion. Varying the ratio of dark matter to stellar mass, we monitored the evolution not only of the percentage of chaotic orbits, but also of the percentages of orbits that compose the main regular resonant families, by classifying regular orbits into different families. Moreover, we tried to reveal how the starting position of the parent periodic orbits of each regular family changes with respect to the fractional portion of dark matter. We compared our results with previous similar work.