Orbit classification in a disk galaxy model with a pseudo-Newtonian central black hole
| Autor: | André F. Steklain, Tareq Saeed, Euaggelos E. Zotos, F. L. Dubeibe |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Physics
Angular momentum Supermassive black hole 010308 nuclear & particles physics Plane (geometry) Astrophysics::High Energy Astrophysical Phenomena FOS: Physical sciences Astronomy and Astrophysics Astrophysics Nonlinear Sciences - Chaotic Dynamics 01 natural sciences Astrophysics - Astrophysics of Galaxies Galaxy Black hole Stars General Relativity and Quantum Cosmology Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) 0103 physical sciences Orbit (dynamics) Astrophysics::Earth and Planetary Astrophysics Chaotic Dynamics (nlin.CD) 010303 astronomy & astrophysics Schwarzschild radius |
| Popis: | We numerically investigate the motion of stars on the meridional plane of an axially symmetric disk galaxy model, containing a central supermassive black hole, represented by the Paczynski-Wiita potential. By using this pseudo-Newtonian potential we can replicate important relativistic properties, such as the existence of the Schwarzschild radius. After classifying extensive samples of initial conditions of trajectories, we manage to distinguish between collisional, ordered, and chaotic motion. Besides, all starting conditions of regular orbits are further classified into families of regular orbits. Our results are presented through modern color-coded basin diagrams on several types of two-dimensional planes. Our analysis reveals that both the mass of the black hole (in direct relation with the Schwarzschild radius) as well as the angular momentum play an important role in the character of orbits of stars. More specifically, the trajectories of low angular momentum stars are highly affected by the mass of the black hole, while high angular momentum stars seem to be unaffected by the central black hole. Comparison with previous related outcomes, using Newtonian potentials for the central region of the galaxy, is also made. 10 pages, 10 figures |
| Databáze: | OpenAIRE |
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