Relation between Mass and Radius of Elliptical Galaxies

概要

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Between the mass M and de Vaucouleurs' effective radius R_e of elliptical galaxies an empirical relation log R_e (in kpc)=(0.64±0.02)×log(M/M⊚)-(6.96±0.02) is found for 21 elliptical galaxies whose masses are computed exclusively from the velocity dispersions recently observed. In elliptical galaxies the radius is to be detemined in the course of galaxy formation. A simple model of galaxy formation is considered; a system of a large number of gas clouds contracts due to dissipation in their mutual inelastic collisions. In the course of contraction stars will form in the clouds in a relatively short period. At a certain critical moment the star formation finishes and the contraction ceases. The radius at this moment is shown to satisfy the above relation on a few assumptions.
理論物理学刊行会の論文
1980-02-25