The Sub-Parsec Scale Jets of AGN
With an angular resolutions of 0.05–0.2 mas, millimeter-VLBI1 observations (at 22, 43, and 86 GHz) allow to investigate the very central — sub-parsec scale — regions of active galactic nuclei (AGN), which are self-absorbed at lower frequencies. Here we briefly present preliminary results from recent observations of Cygnus A at 22 & 43 GHz, which reveal evidence for subluminal motion in jet and counter-jet, and 86 GHz VLBI observations of two extreme γ—blazars, suggesting a tight correlation between their γ—ray activity and the generation of jets.
KeywordsActive Galactic Nucleus Radio Galaxy Contour Level Tight Correlation Radio Luminosity
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