Evaluation of the maximum anisotropy of the stellar velocity distribution in galaxies

Details Evaluation of the maximum anisotropy of the stellar velocity distribution in galaxies Evaluation of the maximum anisotropy of the stellar velocity distribution in galaxies

Jun 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977pazh....3..254p&link_type=abstract

(Pis'ma v Astronomicheskii Zhurnal, vol. 3, June 1977, p. 254-257.) Soviet Astronomy Letters, vol. 3, May-June 1977, p. 134-136.

Astronomy and Astrophysics

Astronomy

10

Galactic Structure, Stellar Motions, Velocity Distribution, Anisotropy, Dispersing, Distribution Functions, Halos, Membrane Structures, Motion Stability, Oscillations, Perturbation

Scientific paper

Membrane oscillations of disk galaxies are investigated, and the existence of a stability limit on the short-wavelength side is demonstrated. A dispersion relation is derived for long-wavelength perturbations of a collisionless homogeneous plane layer. This relation is used to establish the position of the instability band for a stellar-velocity-distribution anisotropy parameter (alpha) much greater than unity and to trace the gradual disappearance of this band as alpha decreases. An approximate value for the critical (maximum) anisotropy is obtained along with an estimate for the minimum thickness of a stable flat system that is bounded in radius. Analysis of the dispersion relation yields an equation that describes the anisotropic ('hose-pipe') instability which develops under specific conditions. The physical significance of this 'hose-pipe' instability is discussed, and it is shown that the maximum mass of an extended halo can be estimated on the basis of the condition that the 'hose-pipe' instability is absent.

Affiliated with

Also associated with

No associations

Rating

Evaluation of the maximum anisotropy of the stellar velocity distribution in galaxies 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 Evaluation of the maximum anisotropy of the stellar velocity distribution in galaxies, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Evaluation of the maximum anisotropy of the stellar velocity distribution in galaxies will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1596985