Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983ap%26ss..93..403c&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 93, no. 2, June 1983, p. 403-418. Research supported by the Consiglio Nazi
Astronomy and Astrophysics
Astrophysics
10
Astronomical Models, Elliptical Galaxies, Galactic Evolution, Galactic Rotation, Galactic Structure, Polytropic Processes, Angular Velocity, Axisymmetric Bodies, Isotropic Media, Metallicity, Pressure Distribution, Stellar Motions
Scientific paper
An investigation is presented of the modeling of real galaxies, as a zeroth-order approximation, in such a manner that rotation can effectively determine their intrinsic shapes. After briefly discussing the connection between the presence of isotropy in pressures and observed metal content gradients in most galaxies, solid body rotating EC polytropes are proposed as acceptable models and the limits of such an approach are considered. Estimates are presented of the theoretical ratio of a characteristic projected rotational velocity to a projected peculiar velocity, and the apparent ellipticity is calculated for the range of axis orientations. It is found that real galaxies display their characteristics according to two distinct sequences. Qualitative considerations indicate that solid body rotating EC polytropes may yield a naive model of galactic evolution.
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