Statistics – Computation
Scientific paper
Apr 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...257...17e&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 257, no. 1, p. 17-23.
Statistics
Computation
18
Galactic Structure, Spiral Galaxies, Computational Astrophysics, Computerized Simulation, Galactic Evolution
Scientific paper
The occurrence of galaxies with outer rings and outer pseudo-rings in four different environments was studied. It was observed that outer rings occur primarily in very early type barred galaxies and pseudo-rings occur in later type galaxies. Results indicate that outer rings occur preferentially in early-type barred galaxies and are less frequent in a dense environment. Pseudo-rings tend to occur in later type galaxies and their frequency increases with increasing environmental density. These results suggest that outer rings are a more evolved evolutionary stage than outer pseudo-rings. The observed correlations were further investigated by means of numerical simulations of ring-companion interactions and ring formation in barred galaxies. It is suggested that companions influence outer rings in some galaxies by destroying them or converting them to pseudo-rings. The formation of outer rings in non-barred galaxies is discussed.
Bellin Andrew D.
Combes François
Elmegreen Bruce G.
Elmegreen Debra Meloy
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