Annu. Rev. Astron. Astrophys. 1992. 30: 311-358
Copyright © 1992 by . All rights reserved


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2.3 Radio Rings

The first radio ring, MG 1131+0456, was discovered by Hewitt et al. (1988) (Figure 4) and is formed when a galaxy lies in front of a compact radio source and distorts the image of the latter into the form of an ``Einstein ring.'' Four more radio rings have been discovered, 0218+357 (Patnaik et al. 1992), MG 1549+3047 (Lehar et al. 1992b), MG 1634+1346 (Langston et al. 1989), and 1830-211 (Rao & Subrahmanyan 1988, Jauncey et al. 1991).

MG1131+0456
Figure 4. 15 GHz image (upper) and 5 GHz image (lower) of the radio ring source MG 1131+0456. (Image supplied courtesy J. Hewitt.)

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