Volume 435, Number 2, May IV 2005
|Page(s)||497 - 506|
|Published online||29 April 2005|
The extreme flare in III Zw 2:
Evolution of a radio jet in a Seyfert galaxy
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
2 Joint Institute for VLBI in Europe, Postbus 2, 7990 AA Dwingeloo, The Netherlands e-mail: email@example.com
3 ASTRON, Postbus 2, 7990 AA Dwingeloo, The Netherlands
4 Department of Astrophysics, Radboud Universiteit Nijmegen, Postbus 9010, 6500 GL Nijmegen, The Netherlands
5 Radio Astronomy Laboratory, University of California at Berkeley, 601 Campbell Hall, CA 94720, USA
6 University of Michigan, Astronomy Department, Ann Arbor, MI 48109-1090, USA
7 Metsähovi Radio Observatory, Helsinki University of Technology, Metsahovintie 114, 02540 Kylmälä, Finland
Accepted: 24 January 2005
A very detailed monitoring of a radio flare in the Seyfert I galaxy III Zw 2 with the VLA and the VLBA is presented. The relative astrometry in the VLBA observations was precise to a few μas. The spectral and spatial evolutions of the source are closely linked, and these observations allowed us to study a textbook example of a synchrotron self-absorbed jet in great detail. We observed a phase where the jet gets frustrated with neither expansion nor spectral evolution. Then the jet breaks free and starts to expand with apparent superluminal motion. This expansion is accompanied by a strong spectral evolution. The results are a good confirmation of synchrotron theory and equipartition for jets.
Key words: galaxies: active / galaxies: individual: III Zw 2 / galaxies: jets / galaxies: Seyfert
© ESO, 2005
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