Astronomy and Astrophysics – Astronomy
Scientific paper
May 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982sci...216..571s&link_type=abstract
Science, vol. 216, May 7, 1982, p. 571-580.
Astronomy and Astrophysics
Astronomy
7
Disk Galaxies, Elliptical Galaxies, Galactic Evolution, Galactic Structure, Cosmology, Galactic Clusters, Galactic Radiation, Gas Density, Globular Clusters, Infrared Astronomy, Mass To Light Ratios, Spiral Galaxies, Stellar Evolution, Stellar Luminosity
Scientific paper
Current observational knowledge of galactic properties which must be explained by any model of galactic evolution is reviewed in light of the importance of evolutionary effects to the study of the large-scale structure of the universe. The classification of galaxies according to their morphologies is discussed, and the properties of elliptical galaxies are summarized, with attention given to frequency distributions in different environments, sizes, luminosities, shape, gas content and star formation, chemical composition, the globular clusters surrounding them, and mass to luminosity ratios. Evidence for evolutionary changes in the color and luminosity of elliptical galaxies is noted, and merger, gravitational assembly and gas dynamical models of galactic evolution are evaluated. Attention is then given to the properties of the disk galaxies, and models for star formation in galactic disks as a result of galactic shocks or by a stochastic process are examined.
Strom Karen M.
Strom Stephen E.
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