Properties of the Stellar Velocity Ellipsoid and Stability in Disks of Spiral Galaxies

Details Properties of the Stellar Velocity Ellipsoid and Stability in Disks of Spiral Galaxies Properties of the Stellar Velocity Ellipsoid and Stability in Disks of Spiral Galaxies

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999ap%26ss.269..139v&link_type=abstract

Astrophysics and Space Science, v. 269/270, p. 139-146 (1999).

Astronomy and Astrophysics

Astrophysics

1

Scientific paper

Disks of spiral galaxies are characterized by effectively exponential brightness and presumably density distributions in both the radial and vertical directions. It is to be expected that the ratio between the scalelength and -height bears a relation to the axis ratio of the stellar velocity ellipsiod. Hydrostatic equilibrium connects the vertical velocity dispersion to the scaleheight. In the radial direction the velocity dispersion relates to the scalelength through conditions of local stability. Preliminary applications are presented.

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