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Astron. Astrophys. 354, 55-66 (2000)

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Total intensity and polarized emission of the parsec-scale jet in 3C 345

E. Ros, J.A. Zensus and A.P. Lobanov

Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany

Received 23 September 1999 / Accepted 11 November 1999


We have studied the parsec-scale structure of the quasar 3C 345 at [FORMULA] 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 ([FORMULA]%), 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 [FORMULA] milliarcseconds from the "core".

Key words: techniques: interferometric – techniques: polarimetric – galaxies: magnetic fields – galaxies: quasars: general – galaxies: quasars: individual: 3C 345 – radio continuum: galaxies

Send offprint requests to: E. Ros (ros@mpifr-bonn.mpg.de)

© European Southern Observatory (ESO) 2000

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