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S.G. Marchenko, A.P. Marscher (Boston U.), A.E. Wehrle (IPAC)
We report new results from high frequency (22, 43 GHz) VLBA monitoring observations from 1994 to 1998 of gamma-bright blazars. From our high-angular resolution (0.15-0.3 mas) images at 3-7 epochs we are able to trace the evolution of jet components. Here we present the results for 9 sources from the sample (0202+149, 0219+428, 0827+243, 1156+295, 1219+285, 1510-089, 1633+382, 1730-130, 2230+114), which have multi-component jets and show a correlation between the components' distances from the core and their superluminal apparent speeds. There are two types of correlation: (i) closer components have lower proper motions (for example, for 1219+285 the apparent speed of one component is 7 times larger than that of the closest component to the core and 5 times larger than that of the next one from the core); (ii) closer components have higher proper motions (for example, in the case of 1633+382 three bright components move from the core at apparent speeds of (14±5)c for the first, (9±3)c for the second, and (5±1)c for the third component relative to the core (H0=65 km/s/Mpc, q0=0.1).
This work is supported in part by the National Science Foundation through grant AST-9802941 and by NASA through the CGRO Guest Investigator Program.