Previous abstract Next abstract
The radio source 4C 39.29 has been identified with a R = 18.5 mag galaxy in the field of the rich cluster of galaxies A963 (z = 0.2). The radio properties of this source suggest that it is probably not associated with the cluster. Spectroscopic observations of the 18.5 mag galaxy have revealed an absorption line spectrum, typical of elliptical galaxies, with a redshift of 0.2, the redshift of A963. Superposed on this absorption line system is a set of emission lines, which can be identified as [O II] and [O III] at a redshift of 0.536. There is some evidence that the R = 19.6 galaxy located 4'' north of the brighter galaxy is also at this higher redshift.
VLA maps of this source, obtained at 2 and 3.6 cm in A configuration, show a double-lobed radio structure. The central source is coincident with the R = 19.6 mag galaxy. The northern jet has a structure similar to that of normal radio jets, while the southern jet is much more complex in structure. This jet has two extremely intense hotspots which lie behind the R = 18.5 mag galaxy. It is possible that these hotspots have some associated emission-line gas which was detected in the original spectroscopic observations. There is an additional region pf bright emission that is non-colinear with the central source and the two hotspots. Gravitational lensing may play a role in producing this complex radio structure.
Wednesday program listing