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physical object > natural object > celestial body > collection of stars > galaxy > radio galaxy > D galaxy > db galaxy |
db galaxy comparison table |
Subject | has definition | is a kind of |
---|---|---|
D galaxy | A supergiant radio galaxy (the most common type of radio galaxy) which has an elliptical nucleus surrounded by an extended envelope. Or, an optical galaxy with a very bright nucleus. In the Morgan classification, a galaxy with rotational symmetry but without pronounced spiral or elliptical structure (a dustless galaxy). In the Yerkes 1974 system a galaxy with an elliptical-like nucleus surrounded by an extensive envelope (see also R galaxy). | radio galaxy |
db galaxy | One of a small number of dumbbell-shaped radio galaxies. They might be called D systems with double nuclei, in which two elliptical nuclei share a common extended envelope. | D galaxy |
Up: D galaxy