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A new classification system for galaxies
van den Bergh, S.
Astrophysical Journal, vol. 206, June 15, 1976, pt. 1, p. 883-887. Research supported by the National Research Council of Canada. (ApJ Homepage)
Publication Date:
NASA/STI Keywords:
Classifications, Galactic Evolution, Galactic Structure, Spiral Galaxies, Abundance, Elliptical Galaxies, Hubble Diagram, Interstellar Gas, Luminous Intensity
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A galaxy classification system is proposed in which normal spirals and lenticulars form parallel sequences within which 'early' and 'late' systems are distinguished by means of their disk-to-bulge ratios. A sequence of 'anemic spirals', which occur most frequently in rich clusters, is found to have characteristics that are intermediate between those of vigorous gas-rich normal spirals and gas-poor systems of type S0. The differences between normal spirals (Sa-Sb-Sc), anemic spirals (Aa-Ab-Ac), and lenticulars (S0a-S0b-S0c) are tentatively interpreted in terms of the influence of environment on the evolution of flattened galaxies.

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