期刊
ASTRONOMY & ASTROPHYSICS
卷 435, 期 2, 页码 497-506出版社
E D P SCIENCES
DOI: 10.1051/0004-6361:20042427
关键词
galaxies : active; galaxies : individual : III Zw 2; galaxies : jets; galaxies : Seyfert
A very detailed monitoring of a radio flare in the Seyfert I galaxy IIIZw2 with the VLA and the VLBA is presented. The relative astrometry in the VLBA observations was precise to a few mu as. 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.
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