Ring galaxies. II - Classification and statistics

Details Ring galaxies. II - Classification and statistics Ring galaxies. II - Classification and statistics

Oct 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986mnras.222..673f&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 222, Oct. 15, 1986, p. 673-682. Research supported by t

Mathematics

Logic

38

Astronomical Models, Classifying, Galactic Structure, Ring Galaxies, Astronomical Catalogs, Barred Galaxies, Cosmology, Density Wave Model, Galactic Clusters

Scientific paper

The results of a morphological study of 69 systems found on the UK Schmidt IIIa-J plate and classified by Arp & Madore (1977) as 'ring galaxies' are presented. Two sub-types of rings are identified: (1) P-type rings, which have a crisp, knotty structure and often a displaced nucleus, and (2) O-type rings, which have a smooth structure and a centrally located nucleus. P-type rings show a statistically significant excess of companions falling within two-ring diameters distance; this the authors take as support for the idea that these galaxies can be identified with collision models for the ring formation.

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