| Popis: |
1821+643 is exceptionally bright at optical wavelengths with MB ≈ −27 (Hutchings & Neff 1991), at a redshift of only 0.297. It is however, a radio-quiet quasar (RQQ) as can be demonstrated by considering e.g., the ratio of the luminosity in [Oiii]λ5007 to the radio luminosity (Lacy, Rawlings, & Hill 1992). In contrast with other radio-quiet quasars however, E 1821+643 is located in a very rich cluster (Lacy et al. 1992) and is purported to reside in a gE host galaxy (Hutchings & Neff 1991). The full-resolution 8 GHz map is seen in Fig. 1. A bright unresolved core is seen with extended emission to the north-west (feature B). Features A and C are accurately diametrically opposed on either side of the core and therefore suggestive of jets; this is further supported by the alignment of features C, D and E. |
