Hough, David

A Three-decade X-band VLBI Study of 3CR Lobe-dominated Quasar Nuclei.

Author list: David Hough

We report X-band VLBI observations of several 3CR lobe-dominated quasar nuclei from 1981 to 2010, mostly obtained with the NRAO VLBA. The goal is to follow flux density outbursts and to fully determine the jet morphology and kinematics on 1-100 pc scales. In 3C207, the core region has flux outbursts at mean intervals of 7 yr; one of these is actually a double outburst from a stationary true core and a "swinging" component 0.5 mas apart. The position angle (PA) of the swinging component varies by 40 degrees, while the PAs of the jet components span 25 degrees. The jet extends to 25 mas. Average