Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...247...59s&link_type=abstract
Astrophysical Journal, Part 1, vol. 247, July 1, 1981, p. 59-76.
Astronomy and Astrophysics
Astrophysics
124
Astronomical Models, Energy Dissipation, Galactic Evolution, Galactic Structure, Cosmology, Disk Galaxies, Elliptical Galaxies, Galactic Clusters, Gas Dynamics, Spiral Galaxies
Scientific paper
An exploration is presented of the hypothesis that a protogalaxy consists of an aggregate of interacting gas clouds which undergo mergers with neighboring systems, as envisaged by both the hierarchical clustering and fragmentation schemes of galaxy formation. Both gaseous dissipation and violet relaxation play fundamental roles in this galaxy formation model, in order to account for such diverse structural and dynamical properties of spheroidal galaxies as velocity anisotropy and metallicity gradients. Protogalaxy mergers during the initial stages of galaxy clustering can account for the observed spatial distribution of spiral, S0, and elliptical galaxies, and galaxy formation can occur slowly and at late epochs, since the time scale for disk formation is less than about 10 to the 10th years.
Norman Colin
Silk Joseph
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