Multi-Frequency & Multi-Epoch VLBI Study of Cygnus A

Details Multi-Frequency & Multi-Epoch VLBI Study of Cygnus A Multi-Frequency & Multi-Epoch VLBI Study of Cygnus A

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aspc..340...30b&link_type=abstract

Future Directions in High Resolution Astronomy: The 10th Anniversary of the VLBA, ASP Conference Proceedings, Vol. 340. Edited

Astronomy and Astrophysics

Astronomy

14

Scientific paper

We present the first multi-frequency phase-referenced observations of Cygnus A done with the VLBA at 15 and 22 GHz. We find a pronounced two-sided jet structure, with a steep spectrum along the jet and a highly inverted spectrum towards the counter-jet. The inverted spectrum and the frequency dependent jet to counter-jet ratio suggest an obscuring torus in front of the counter-jet. From 14 epochs of 15 GHz VLBA data we accurately derive the jet and counter-jet kinematics. For the inner jet (r ≤ 5 mas) we measure motions of β..app}≈ 0.2-0.5 h-1 and on the counter-jet side we find βapp≈ 0.03±0.02 h-1. We discuss the jet velocities within the unified jet model.

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