出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：15 VLBA observations of the BL Lac object 0716+714, carried out between 1994.67 and 2006.40
at 15 GHz, have been analyzed. Part of the data (12 epochs) were obtained within the Mojavesurvey
project and reanalyzed by us. We present a new motion scenario for jet model component
motion in this source which suggests that no longterm-outwardmotion 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.
