K. Kellermann, M. Lister, D. Homan (NRAO)
Y. Kovalev (NRAO and Astro Space Center)
A. Zensus (NRAO and MPIfR)
M. Cohen (Caltech)
Ray Norris (ATNF)
R. Vermeulen (ASTRON)
E. Ros, M. Kadler (MPIfR)
VLBA Project Code: BZ4, BZ23, BZ14, BK37, BK48, BK52, BK68
Observing time range 1994-2001
Quasars and AGN eject relativistic plasma jets with velocities very close to the speed of light. Observations with the VLBA made since 1994, show a wide range of apparent velocity due in part to projection effects, and in part due to a dispersion in intrinsic velocity.
Usually, the observed jet flow is in the direction of an established jet. However, many jets show significant bends and twists where the observed motion is not radial, but is aligned with the local jet direction suggesting that the jet flow occurs along pre-existing bent channels. In a few cases a clear change in speed and direction is observed as a feature flows along the jet.
Kellerman et al. 2004, Sub-Milliarcsecond Imaging of Quasars and AGN III. ApJ, in press, astro-ph/0403320
Astronomical Journal, *124*:662-674 (2002) "Sub-Milliarcsecond Imaging of Quasars and Active Galactic Nuclei"
Astronomical Journal, *115*:1295-1318 (1998) "Realignment on Kiloparsec Scales in 3C 279"
ApJ, 589:L9-L12, (2003) "4C+12.50: A superluminal precessing jet in the recent merger system IRAS 13451+1232"
ApJ, 584: 135-146 (2003) "The Shroud Around the Twin Radio Jets in NGC 1052"
A & A, 401 (2003)