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

2003-09-15

arxiv.org/abs/astro-ph/0309403v1

Astronomy and Astrophysics

Astrophysics

To be published in "Future Directions in High Resolution Astronomy" (A Celebration of the 10th Anniversary of the VLBA), held

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 beta_app ~ 0.2-0.5 h^{-1} and on the counter-jet side we find beta_ app ~ 0.03+-0.02 h^{-1}. We discuss the jet velocities within the unified jet model.

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