Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979mnras.186..503t&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 186, Feb. 1979, p. 503-517. Research supported by the Alfred P. Sloan F
Astronomy and Astrophysics
Astronomy
75
Astronomical Models, Elliptical Galaxies, Galactic Evolution, Galactic Structure, Stellar Evolution, Stellar Motions, Abundance, Chemical Evolution, Collisions, Disks (Shapes), Intergalactic Media, Interstellar Gas, Mass Distribution
Scientific paper
It is suggested that the formation of elliptical galaxies proceeds by a hierarchical sequence of mergers among subsystems. In this model, stars are assumed to form in bursts induced by collisions, and the mergers build up systems of increasing total mass. During this process, the mass fraction in stars and the metallicities of stars and residual gas increase. A reason for the empirical correlation between metallicity and mass for elliptical galaxies is suggested, and causes of cessation of star formation are considered. Accretion of diffuse outlying gas would lead to a disk, while an elliptical galaxy would remain if the residual gas is swept away before a disk is formed. The model is used to explain the relative frequency of different kinds of galaxies.
Larson Richard B.
Tinsley Beatrice M.
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