Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986aj.....92..700w&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 92, Oct. 1986, p. 700-705.
Astronomy and Astrophysics
Astronomy
4
Celestial Mechanics, Galactic Clusters, Galactic Structure, Interacting Galaxies, Ring Galaxies, Astronomical Photography, H Ii Regions, Rings
Scientific paper
Four ring galaxies and two candidates have been discovered in the Hercules supercluster of galaxies by applying the photographic contrast-enhancement technique to deep IIIa-J or IIIa-F Schmidt plates. They appear to belong either to cluster halos or to a field population. IC 1194 has been found to have the largest linear diameter (≡133 kpc: on the scale of H0 = 55 km s-1Mpc-1) and the brightest magnitude (MV = -22.2) so far found. It shows no patchy structure on its ring, and hence no prominent H II regions. This is probably an S0-ring galaxy, i.e., a ring galaxy whose progenitor might have been a gas-free S0 galaxy. Dressler #36 of the Abell 2151 cluster has six bright knots which are surrounded by a faint diffuse ring. This is quite reminiscent of the structure of a self-gravitating ring undergoing "bead instability".
Heudier J.-L.
Sasaki Makoto
Wakamatsu K.-I.
Watanabe Ta.
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