Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983mnras.202.1195p&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 202, Mar. 1983, p. 1195-1207, 1209-1219. Research supported by the Zonta
Astronomy and Astrophysics
Astronomy
26
Anisotropy, Elliptical Galaxies, Galactic Structure, Oblate Spheroids, Distribution Functions, Galactic Rotation, Poisson Equation, Velocity Distribution
Scientific paper
The investigation has the objective to try to match some particular models of oblate spheroids with observations and thus show that elliptical galaxies may be oblate spheroids with anisotropy. Attention is given to the distribution function, the solution of the Poisson equation, and the significance of various parameters. An approximate third integral is found for an axially symmetrical potential and some models of elliptical galaxies are computed using it. The considered models are oblate spheroids with anisotropy. They cannot become flatter than about E2.3 without fast rotation. This limitation is related to the form of the distribution function used. Attention is also given to models of elliptical galaxies as oblate spheroidal systems with little rotation. The flattening of the system is related to the inclusion of an approximate third integral in the distribution function. It is found that the models agree quite well with the observations.
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