The instability of prolate stellar systems

Details The instability of prolate stellar systems The instability of prolate stellar systems

Dec 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979azh....56.1158p&link_type=abstract

Astronomicheskii Zhurnal, vol. 56, Nov.-Dec. 1979, p. 1158-1164. In Russian.

Astronomy and Astrophysics

Astronomy

1

Dynamic Stability, Intergalactic Media, Prolateness, Spiral Galaxies, Stellar Models, Stellar Systems, Circular Cylinders, Perturbation Theory, Stellar Rotation

Scientific paper

The stability of highly prolate stellar systems such as the bars of barred spiral galaxies and intergalactic bridges with respect to small perturbations is examined by means of a general method applicable to all quasi-one-dimensional systems. Consideration is given to the stability of a model of a thin circular cylinder not allowed to rotate around an axis perpendicular to its longitudinal axis with respect to bending perturbations (hose instability). A stability diagram is presented which shows that the instability is stabilized at sufficiently small perturbation scales and particle velocity distribution anisotropies. A comparison with exact calculations for a homogeneous cold cylinder indicates that the region of instability of the cold cylinder is insignificantly wider than that obtained by the present model, due to the degeneracy of a cold cylinder.

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