Multi-frequency Polarization Imaging of Blazars with Cyclic Activity

Abstract

Results of multi-frequency VLBA polarization imaging for sources showing evidence of quasi-periodic variations in their total flux density are discussed. Possible origins of the observed behavior are proposed.

3 pages, 3 figures, to appear in "Future Directions in High Resolution Astronomy: The 10th Anniversary of the VLBA" J.D. Romney & M.J. Reid (eds.)