Computer Science – Numerical Analysis
Scientific paper
Mar 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aj....107..958a&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 107, no. 3, p. 958-970
Computer Science
Numerical Analysis
32
Equilibrium Flow, Evolution (Development), Galaxies, Kinematics, Polar Orbits, Precession, Stability, Time Dependence, Tumbling Motion, Asymmetry, Equations Of Motion, Gravitational Fields, Hamiltonian Functions, Modes (Standing Waves), Numerical Analysis
Scientific paper
A number of early galaxies show a polar ring of gas, dust, and stars lying roughly perpendicular to the apparent major axis of the central galaxy. Here, we study the dynamics of a self-gravitating annulus of matter which is inclined to the principal planes of a triaxial galactic potential tumbling about its short axis. In a steadily precessing equilibrium state, the precession rate of the ring in the potential must be equal to the tumbling speed of the triaxial figure. As in an oblate galaxy, both stable and unstable equilibria exist: in the tumbling triaxial potential, there are stable equilibria bending toward the equator, if the ring is light, and toward the pole, at higher ring mass. The former are similar to the `anomalous retrograde orbits,' while the latter resemble the stable equilibria for a self-gravitating ring in an oblate potential. We follow the time evolution of unstable polar rings. In an oblate galaxy potential, even if the ring is not sufficiently massive to be stabilized, self-gravity can still cause the characteristic warp up toward the pole. In the triaxial potential, when the inclination of the polar ring is not such that its precession rate matches the galaxy tumbling speed, the ring can wobble gently in a quasiperiodic manner if it is massive enough, but is disrupted if its mass is too low.
Arnaboldi Magda
Sparke Linda S.
No associations
LandOfFree
Self-gravitating polar rings in axisymmetric and triaxial galaxy potentials does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Self-gravitating polar rings in axisymmetric and triaxial galaxy potentials, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Self-gravitating polar rings in axisymmetric and triaxial galaxy potentials will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1870267