Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics
Scientific paper
2009-12-27
Astronomy and Astrophysics
Astrophysics
Cosmology and Extragalactic Astrophysics
6 pages, 4 figures, to appear in Proceedings of "Accretion and Ejection in AGN: A Global View", Lake Como, Italy, June 22-26,
Scientific paper
The 16th magnitude quasar 3C 345 (redshift z=0.5928) shows structural and emission variability on parsec scales around a compact unresolved radio core. For the last three decades it has been closely monitored with very long baseline interferometry (VLBI), yielding a wealth of information about the physics of relativistic outflows and dynamics of the central regions in AGN. We present here preliminary results for the long-term jet evolution, based on the 15 GHz monitoring data collected by the MOJAVE survey and various other groups over the last ~14 years and combined with data from earlier VLBI observations of 3C 345 which started in 1979. We discuss the trajectories, kinematics, and flux density evolution of enhanced emission regions embedded in the jet and present evidence for geometrical (e.g. precession) and physical (e.g. relativistic shocks and plasma instability) factors determining the morphology and dynamics of relativistic flows on parsec scales.
Lobanov Andrei P.
Schinzel Frank K.
Zensus Anton J.
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