Abstract
The nearby FRI radio source 3C 66B has been studied with the VLA at 1.5, 8 and 15 GHz with high resolution and sensitivity. The first detailed maps of the counterjet are presented. Polarization maps in the jet and counterjet are shown; in each a resolved parallel-field region surrounds a central core which changes from a parallel to a perpendicular field configuration. A model of the jets involving a relativistic central region and a slower outer sheath is discussed, and in this context 3C 66B is compared with similar sources.
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