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S. G. Jorstad, A. P. Marscher (BU), J. A. Stevens (MSSL), M. L. Lister (NRAO), A. Stirling (Central Lancashire U.), P. S. Smith (Steward Obs.), J.-L. Gomez (IAA, Spain), T. J. Cawthorne (Central Lancashire U.), D. C. Gabuzda (JIVE), J. R. Forster (UC Berkeley), W. K. Gear (Cardiff U.), E. I. Robson (JAC)
We have completed a 3-year program of bimonthly polarimetric observations of 15 quasars, BL Lac objects, and radio galaxies at high frequencies. We present sequences of total and polarized intensity images obtained with the VLBA at 7 mm at 17 epochs from 25/26 March 1998 to 14 April 2001. These images are accompanied at many epochs by simultaneous measurements of polarization at 1.35/0.85 mm obtained with the JCMT as well as less frequent simultaneous optical polarization measurements performed at Steward Observatory. The sequences display a rich variety of systematic behaviour and correlated patterns as well as puzzling complexities. The mm-wave and optical polarization often is similar, suggesting common locations of emission in the core or/and superluminal knots.
This work was supported in part by National Science Foundation grants AST-9802941 and AST-0098579.
The author(s) of this abstract have provided an email address for comments about the abstract: jorstad@rjet.bu.edu