Anisotropic tensor virial models for elliptical galaxies with rotation or vorticity

Details Anisotropic tensor virial models for elliptical galaxies with rotation or vorticity Anisotropic tensor virial models for elliptical galaxies with rotation or vorticity

May 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...197...91b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 197, no. 1-2, May 1988, p. 91-104.

Astronomy and Astrophysics

Astrophysics

11

Anisotropy, Dynamic Characteristics, Elliptical Galaxies, Galactic Rotation, Galactic Structure, Vorticity, Astronomical Models, Morphology, Physical Properties, Velocity Distribution

Scientific paper

The authors present a new class of anisotropic inhomogeneous models of elliptical galaxies based on the tensor virial theorem. These models are maintained in equilibrium either by the rotation of the figure (i.e. of the potential), or, alternatively, by stellar streaming with respect to the figure, which is fixed in space. The only hypothesis on the density distribution is that the equidensity surfaces are similar concentric ellipsoids. Both triaxial and spheroidal equilibrium solutions are found, with a variety of geometrical and dynamical configurations. The stability of equilibrium systems against global oscillations is tested under particular assumptions on the behaviour of the velocity fields. It is found that the triaxial configurations are in general energetically favoured with respect to the spheroidal ones.

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