-
Total intensity and polarized emission of the
parsec-scale jet in 3C 345
,
E. Ros, J. A. Zensus, & A. P. Lobanov
Astronomy & Astrophysics, in press (2000)
- Abstract
We have studied the
parsec-scale structure of the quasar 3C 345 at
λλ 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 (m~15%), 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 ~1.5 milliarcseconds from the ``core".
Eduardo Ros
ros@mpifr-bonn.mpg.de