Paper:	VLBA Imaging of a Large Sample of Blazars
Volume:	144, Radio Emission from Galactic and Extragalactic Compact Sources, IAU Colloquium 164
Page:	159
Authors:	Attridge, J. M.; Roberts, D. H.; Wardle, J. F. C.
Abstract:	As part of our continuing study of parsec-scale magnetic fields in active galactic nuclei we have obtained deep polarization-sensitive images of the blazar \src\ with the VLBA at 5 GHz. These dramatic images reveal a magnetized layer of material on the outer surfaces of the jet, distinct from the bulk of the jet. This morphology suggests interaction of the jet with the surrounding medium, the resulting shear stretching the magnetic field lines in the direction of the flow. Further multi-frequency polarization-sensitive observations of \src\ offer the opportunity to study radio jet-ambient medium interactions in detail.

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