A new classification system for galaxies

Details A new classification system for galaxies A new classification system for galaxies

Jun 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...206..883v&link_type=abstract

Astrophysical Journal, vol. 206, June 15, 1976, pt. 1, p. 883-887. Research supported by the National Research Council of Canad

Astronomy and Astrophysics

Astrophysics

277

Classifications, Galactic Evolution, Galactic Structure, Spiral Galaxies, Abundance, Elliptical Galaxies, Hubble Diagram, Interstellar Gas, Luminous Intensity

Scientific paper

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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