Hose instability in galactic ring structures

Details Hose instability in galactic ring structures Hose instability in galactic ring structures

Jan 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989velen.......84a&link_type=abstract

Leningradskii Universitet, Vestnik, Matematika, Mekhanika, Astronomiia (ISSN 0024-0850), Jan. 1989, p. 84-90. In Russian.

Statistics

Computation

Computational Astrophysics, Galactic Structure, Gravitational Fields, Holes, Magnetic Fields, Spiral Galaxies, Stability

Scientific paper

A galactic ring structure consisting of a gas with a frozen-in magnetic field is analyzed using an approximate model in the form of a flexible hose. The gas medium is assumed to be incompressible, with elasticity ascribed to the magnetic field. It is found that, in the absence of a gravitational field, hose instability does not arise in closed configurations. When the gravitational field of the galaxy is taken into account, the ring is stable with respect to plane oscillations over a wide range of the ring radius and unstable with respect to vertical oscillations at the periphery in spiral galaxies.

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