AAS Meeting #193 - Austin, Texas, January 1999
Session 5. Relativistic Jets and their Interactions
Display, Wednesday, January 6, 1999, 9:20am-6:30pm, Exhibit Hall 1

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[5.11] Sub-milliarcsec-scale Jets in Gamma-Bright Blazars: Superluminal Motion at High Frequencies

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.

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