Sinking satellites and the halo velocity ellipsoid

Details Sinking satellites and the halo velocity ellipsoid Sinking satellites and the halo velocity ellipsoid

Oct 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...345..196c&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 345, Oct. 1, 1989, p. 196-202. Research supported by NSERC.

Statistics

Computation

6

Computational Astrophysics, Galactic Structure, Interacting Galaxies, Milky Way Galaxy, Celestial Mechanics, Density Distribution, Ellipsoids, Radial Velocity, Solar Neighborhood

Scientific paper

A model for galactic disk formation is proposed in which the mass of the disk is largely created from the mass brought in as discrete objects which spiral down through the halo as a result of dynamical friction and perturb the orbits of the stars already present in the halo. In a spherically symmetric halo the halo orbits are perturbed nearly equally in all directions of motion, tending to maintain a balance between the two tangential components of the velocity ellipsoid. In the presence of a disk, the disk gravity increases the frequencies of vertical oscillation over the horizontal frequencies, and the relatively low-frequency perturbations from the satellites have a diminished effect on the vertical motions of halo stars. Consequently, the motions horizontal to the disk may grow to exceed the vertical motions, as is observed.

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