Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979azh....56..252b&link_type=abstract
Astronomicheskii Zhurnal, vol. 56, Mar.-Apr. 1979, p. 252-257. In Russian.
Astronomy and Astrophysics
Astronomy
8
Density Distribution, Galactic Rotation, Spiral Galaxies, Angular Momentum, Dynamic Models, Gas Density, Histograms, Rotating Disks, Rotating Matter, Stellar Mass
Scientific paper
It is suggested that the presence of two maxima in the rotation curves of certain spiral galaxies and the brightness distributions of these galaxies may be explained by a decrease in the density of the stellar disk toward the center in the inner regions of the galaxies. For M81 and NGC 4258 three-component models consisting of a disk with a 'hole' and a spheroidal component are proposed which account satisfactorily for the characteristics of the rotation curves. The total masses of these two galaxies are determined. It is concluded that the existence of a central matter deficit in a stellar disk may indicate preferential star formation from material with low angular momentum during formation of the spheroidal component (before disk formation).
Barabanov A. V.
Zasov Anatoli V.
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