Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989aj.....97.1000o&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 97, April 1989, p. 1000-1009.
Astronomy and Astrophysics
Astronomy
4
Astronomical Models, Elliptical Galaxies, Galactic Structure, Hydrodynamic Equations, Self Consistent Fields, Celestial Mechanics, Eccentricity, Galactic Rotation, Gravitational Fields, Jeans Theory
Scientific paper
Self-consistent models for elliptical galaxies have been constructed and applied to a sample of 16 observed E systems. The models are based on the hydrodynamical Jeans equations, and the E galaxies are assumed to be oblate ellipsoids of constant ellipticity. The majority of the galaxies in the sample are found to be anisotropic. Most of the anisotropic systems have greater velocity disperison in the equatorial plane than in the direction of the galaxy's symmetry axis, so that their flattenings are substantially determined by velocity anisotropy. It is found that half of the sample is well described by models with M/L ratios that increase with the distance from the galactic center. Such behavior is indicative of the existence of nonluminous matter in those early-type galaxies. The possibity that this result may be quite general for ellipticals is also discussed.
de Freitas Pacheco José Antonio
Ortega Vladimir G.
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