"Oscillating" components in the BL Lac object 0716+714?

Details "Oscillating" components in the BL Lac object 0716+714? "Oscillating" components in the BL Lac object 0716+714?

2006-11-06

arxiv.org/abs/astro-ph/0611184v1

PoS8thEVN:006,2006

Astronomy and Astrophysics

Astrophysics

6 pages, 5 figures, to appear in the proceedings of the 8th European VLBI Network Symposium on New Developments in VLBI Scienc

Scientific paper

15 VLBA observations of the BL Lac object 0716+714, performed between 1994.67 and 2006.40 at 15 GHz, have been analyzed. Part of the data (12 epochs) were obtained within the Mojave-survey project and reanalyzed by us. We present a new motion scenario for jet model component motion in this source which suggests that no longterm-outward motion but rather an oscillation of components around an average core separation is taking place. Although no significant outward motion in the core separation can be found, motion with regard to the position angle is observed. We give lower limits for the derived apparent motions and Doppler factors and compare them with values published in the literature. We find a relation between the total flux-density evolution at 14.5 GHz (UMRAO data) and the position angle changes observed for the jet component closest to the core. We suggest a significant geometric contribution to the longterm flux-density variability in 0716+714.

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