The bright radio source 3C 345 was optically identified in 1965, only two years after the first quasars were discovered (Goldsmith and Kinman 1965). It quickly became noted for its extreme variability in all wavelengths (see references in Hewitt and Burbidge 1993 p.797). It is also a VLBI jet object which shows superluminal motion when placed at its redshift distance.
A number of other active objects were known to be in its vicinity but it was not until G. Burbidge pointed out to me that a low redshift galaxy, NGC6212, lay very close to 3C 345 that I investigated further and found that the region had been included in two extended fields which had been uniformly searched for quasars with CHFT slitless spectra plates (Crampton et al. 1988). It was immediately apparent that the most conspicuous concentration of quasars in the 8 sq. deg. region which included 3C 345 was centered on this famous, active object. The analysis in the following paper concentrates on the nature and significance of the association and compares it with a number of similar associations.
© European Southern Observatory (ESO) 1997
Online publication: April 6, 1998