The Kinematics of S5 1803+784

Details The Kinematics of S5 1803+784 The Kinematics of S5 1803+784

2006-11-06

arxiv.org/abs/astro-ph/0611181v1

Astronomy and Astrophysics

Astrophysics

6 pages, 3 figures, to appear in the proceedings of the 8th EVN Symposium, Torun September 26-29, 2006

Scientific paper

We present the results of a multi-frequency analysis of the structural variability in the parsec-scale jet of the blazar S5 1803+784. More than 90 epochs of observations at 6 frequencies from 1.6 GHz up to 22 GHz have been combined and analyzed. We discuss an alternative jet model for the source. In contrast to previously discussed motion scenarios for S5 1803+784, we find that the jet structure within 12 mas of the core can most easily be described by seven "oscillating" jet features. We find that the parameters of jet features, such as core separation, position angle and flux density, change in a periodic way with a timescale of about 4 years. We also find evidence for a correlation between these parameters and the total flux density variability. We suggest a scenario incorporating a periodic form of motion (e.g. rotation, precession), with a non-negligible geometrical contribution to explain the observational results.

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