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Total intensity and polarized emission of the parsec-scale jet in 3C 345
J.A. Zensus and
Received 23 September 1999 / Accepted 11 November 1999
We have studied the parsec-scale structure of the quasar 3C 345 at 1.3, 2, 3.6, and 6 cm, using total intensity and linear polarization images from 3 epochs of VLBA observations made in 1995.84, 1996.41, and 1996.81. The images show an unresolved "core" and a radio jet extending over distances up to 25 milliarcseconds. At 1.3 and 2 cm, images of the linearly polarized emission reveal an alignment of the electric vector with the extremely curved inner section of the jet. At 6 cm, the jet shows strong fractional polarization (%), with the electric vector being oriented perpendicular to the jet. This is consistent with the existence of a transition from the shock-dominated to the plasma interaction-dominated emission regimes in the jet, occurring at a distance of milliarcseconds from the "core".
Key words: techniques: interferometric techniques: polarimetric galaxies: magnetic fields galaxies: quasars: general galaxies: quasars: individual: 3C 345 radio continuum: galaxies
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