Physics
Scientific paper
Feb 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983natur.301..574s&link_type=abstract
Nature, vol. 301, Feb. 17, 1983, p. 574-578. Research supported by the Centre National de la Recherche Scientifique and NASA.
Physics
28
Dwarf Galaxies, Galactic Evolution, Angular Momentum, Dissipation, Molecular Clouds, Velocity Distribution
Scientific paper
A two-dimensional parametrization of galactic evolution from the primordial state involving mean surface density and velocity dispersion is presented. A dissipation diagram for large-scale structure is presented and its evolutionary significance explored while considering both the pancake and the hierarchical clustering models of galaxy formation. Gaseous dissipation is studied by assuming that individual clouds or turbulent elements of gas interact supersonically, producing strong shocks. It is found that many diverse properties of galaxies can be understood in terms of an evolutionary sequence operative during an early gas-rich protogalactic phase in which dissipation played a key role. Dwarf galaxies may be the fossilized link between primordial fluctuations and the giant galaxies observed today, relics of a past era of prolific galaxy formation.
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