Mathematics – Logic
Scientific paper
Dec 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982mnras.201.1021e&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 201, Dec. 1982, p. 1021-1034.
Mathematics
Logic
147
Astronomical Catalogs, Barred Galaxies, Galactic Clusters, Galactic Structure, Spatial Distribution, Spiral Galaxies, Classifications, Density Wave Model, Flocculating
Scientific paper
A 12-division morphological system emphasizing arm continuity, length and symmetry has been developed for the classification of all spiral galaxies according to the regularity of their spiral arm structure. Arm classifications were tabulated for 305 barred and nonbarred spiral galaxies; of these, 79 are isolated, 52 are binary and 174 are in groups. Among the isolated SA galaxies, 68 + or - 10% have irregular and fragmented, or 'flocculent', spiral structures. Only 32 + or - 10% have symmetric spiral arms in the classic grand design pattern. Flocculent spirals are the most common structures of galaxies without companions or bars. Since flocculent galaxies may have bars and companions, and grand design galaxies may have neither bars nor companions, such perturbations are neither perfectly effective nor always necessary in the driving of grand design patterns.
Elmegreen Bruce G.
Elmegreen Debra Meloy
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