Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...247...45a&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 247, no. 1, July 1991, p. 45-55.
Astronomy and Astrophysics
Astrophysics
3
Galactic Evolution, Milky Way Galaxy, Spiral Galaxies, Jeans Theory, Radial Velocity, Velocity Distribution
Scientific paper
An attempt to model the observed radial velocity dispersion profiles the Galaxy and NGC 3198 by using exact solutions of Jeans equations is presented. No use is made of the epicyclic approximations, so that these solutions can be applied quite generally to model the velocity dispersions in the plane of axisymmetric collisionless systems. The possibility of constraining models of the mass distribution of a spiral by using the velocity dispersion profile is considered. For the Galaxy, using the data of Lewis and Freeman (1989) and Woolley et al. (1977), no firm conclusions about the best fitting mass model can be reached, mainly because the data are incomplete and affected by observational uncertainties. For NGC 3198, although the solutions fit the observations quite well, the observational errors do not allow any strong constraint on the mass models.
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