18-22 cm VLBA observations of three BL Lac objects

Abstract

VLBA polarization observations of the 135 AGNs in the MOJAVE-I sample have recently been obtained at four frequencies between 1.3 and 1.7 GHz. These observations are sensitive to compact radio emission on scales from a few to tens of parsecs from the VLBA core. VLBA observations at the same frequencies were obtained earlier for 34 BL Lac objects, enabling a multiepoch study of the extended radio jets of these objects. As an initial step in this study, we have constructed new images for three BL Lac objects with rich jet structures: 0735+178, 1803+784 and 2200+420 (BL Lac), which are analyzed together with the previous results of Hallahan and Gabuzda (2008). We consider the morphology, polarization (magnetic field) structure and Faraday rotation distributions of these objects.11th European VLBI Network Symposium Users Meeting,