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Paper: Rapid Polarization Variability in 0716+714 Far from the VLBI Core
Volume: 159, BL Lac Phenomenon
Page: 447
Authors: Gabuzda, D. C.; Kochenov, P. Yu.; Cawthorne, T. V.
Abstract: We discuss rapid polarization variability during our 6-cm global VLBI observations of the BL Lac object 0716+714. Integrated measurements made with the VLA during the VLBI experiment indicated that the polarization position angle for the VLA core rotated through 50 degrees in 12 hours. Our analysis revealed that this variability occurred roughly 30 mas from the VLBI core. This is an extremely unexpected result, since it is usually believed that intraday variability can occur only in very compact structures very close to the nucleus. These variations may be associated with a compact shock in the jet at a substantial distance from the core. Independent of the specific nature of the varying feature, it is clear that compact structures on a range of scales must be taken into consideration in studies of rapid variability in AGN.
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