Galactic bars with central mass concentrations - Three-dimensional dynamics
1993; IOP Publishing; Volume: 409; Linguagem: Inglês
10.1086/172644
ISSN1538-4357
AutoresHashima Hasan, D. Pfenniger, Colin Norman,
Tópico(s)Quantum chaos and dynamical systems
Resumoview Abstract Citations (150) References (45) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Galactic Bars with Central Mass Concentrations: Three-dimensional Dynamics Hasan, Hashima ; Pfenniger, Daniel ; Norman, Colin Abstract The stellar dynamics at the transitions between a strongly barred and rotating potential and a spherical and dense central mass concentration is investigated in a model potential. Three different degrees of concentration of the central mass are studied. The main families of three-dimensional periodic orbit are found by numerical means. The structure of phase space is presented by bifurcation diagrams and surfaces of section. A large region of instability develops near the, inner Lindblad resonance (ILR) due to the strong bar potential. In such a mass configuration the radial ILR is typically near the corresponding vertical ILR, consequently the instability of orbits is radial as well as vertical, helping the heating of disk stars into a bulge. These secular evolution processes from barred to unbarred and in the direction of increasing the bulge-to-disk ratio should affect the evolution of galaxies over a Hubble time. Publication: The Astrophysical Journal Pub Date: May 1993 DOI: 10.1086/172644 Bibcode: 1993ApJ...409...91H Keywords: Barred Galaxies; Galactic Evolution; Galactic Nuclei; Galactic Structure; Stellar Motions; Stellar Orbits; Branching (Mathematics); Computerized Simulation; Linear Programming; Many Body Problem; Poincare Problem; Astrophysics; CELESTIAL MECHANICS; STELLAR DYNAMICS; GALAXIES: EVOLUTION; GALAXIES: KINEMATICS AND DYNAMICS; GALAXIES: NUCLEI full text sources ADS |
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