Progress in the dynamical study of galactic oscillations.

Details Progress in the dynamical study of galactic oscillations. Progress in the dynamical study of galactic oscillations.

Sep 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998pabei..16..242f&link_type=abstract

Prog. Astron., Vol. 16, No. 3, p. 242 - 249

Astronomy and Astrophysics

Astronomy

Galaxies: Oscillations, Galaxies: N-Body Simulations, Galaxies: Dynamics

Scientific paper

The indirectly evidences of galactic oscillations are briefly presented. Some of the mentioned evidence are kinematic warps appearing in disk galaxies, the behaviour of the rotational curves of galaxies, non-orthogonality and non-parallelism between the two longest axes of a bar and of a central spheroid contained in a barred galaxy, etc. These evidences suggest that the real galaxies should be in some oscillation states, though they are not conclusive ones. The progress in the theoretical studies of galactic oscillations are reviewed. The related N-body simulations show that almost all galaxies are in long-lived oscillation states. The oscillations manifest themselves by quasi-periodic dependences on the time of some macroscopical quantities, such as the total kinematic energy, the components of the total inertia tensor, the Lagrangian radii and the Lagrangian displacements. The authors give prospects for the future works in this field. Since direct observations of galaxy oscillations are intrinsically difficult, the observable effects, provided by theoretical works, of the oscillation are needed to be used to confirm observationally the oscillations of the real galaxies.

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