Optical properties of radio and cD galaxies.
Abstract
The extent and ellipticities of the envelopes of 71 radio galaxies with known redshifts in the range from 0.02 to 0.10 were measured on glass copies of the red plates of the Mount Palomar Sky Survey. The measurements were used to classify the radio galaxies on the notation introduced by Matthews, Morgan and Schmidt (1964). A search was made for rich clusters of galaxies to which the radio galaxies might belong, and 23 such clusters were found. Evidence is presented to show that most of these proposed associations are probably real. Of the 10 radio galaxies classified as cD, seven lie at projected distances of no more than about 0.1 Mpc from the centers of Abell clusters and two are probably located centrally in other clusters; the situation of the cD galaxy 3C 306 is uncertain. For six rich clusters with dominant cD galaxies, the mean radial-velocity difference between the cD galaxies and their clusters is 202 + or - 72 km/s. The central location and slow motion of cD galaxies in clusters support the idea that cD galaxies form as clusters evolve dynamically.
- Publication:
-
Monthly Notices of the Royal Astronomical Society
- Pub Date:
- September 1978
- DOI:
- 10.1093/mnras/184.3.611
- Bibcode:
- 1978MNRAS.184..611G
- Keywords:
-
- Galactic Structure;
- Optical Properties;
- Radio Galaxies;
- Astronomical Photometry;
- Classifications;
- Elliptical Galaxies;
- Galactic Clusters;
- Galactic Rotation;
- Sky Surveys (Astronomy);
- Astronomy;
- Clusters of Galaxies:Radio Galaxies