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The Sub-Parsec Scale Jets of AGN

Published online by Cambridge University Press:  25 May 2016

T.P. Krichbaum ,
W. Alef  and
A. Witzel
T.P. Krichbaum
Affiliation:
Max-Planck-Institut für Radioastronomie, Bonn, Germany
W. Alef
Affiliation:
Max-Planck-Institut für Radioastronomie, Bonn, Germany
A. Witzel
Affiliation:
Max-Planck-Institut für Radioastronomie, Bonn, Germany

Extract

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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.

Type
Properties of Radio Sources
Information
Symposium - International Astronomical Union , Volume 175: Extragalactic Radio Sources , 1996 , pp. 11 - 13
Copyright
Copyright © Kluwer 1996