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Astron. Astrophys. 341, 418-426 (1999)


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8.4 GHz VLBI monitoring of the gamma-bright blazar PKS 0528+134

S. Britzen 1,2, A. Witzel 1, T.P. Krichbaum 1, S.J. Qian 1,3 and R.M. Campbell 2

1 Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany
2 Netherlands Foundation for Research in Astronomy, 7991 PD Dwingeloo, The Netherlands
3 Beijing Astronomical Observatory, Chinese Academy of Sciences, Beijing 10080, P.R. China

Received 7 July 1998 / Accepted 17 August 1998

Abstract

We present an analysis of the structural evolution of the jet of PKS 0528+134, one of the strongest gamma-active blazars. We study almost eight years (1986.25 - 1994.07) of jet evolution using 20 epochs taken from the extensive database of X-band geodetic VLBI observations. We discuss the activity and kinematics of the jet in the light of the prominence of this source in the high energy regime. Rapid structural changes take place in its jet, and the VLBI image undergoes obvious structural evolution across the epochs in which the component motion follows different bent paths. The simplest model portrays PKS 0528+134 as a bent jet of length [FORMULA] mas comprising seven jet features. Not unexpectedly for a gamma-active quasar, we find superluminal motion of [FORMULA] for five of the jet components. These five jet features can be traced over the entire observing period, while two newer components were ejected at times near epochs of enhanced gamma-ray activity. We can associate the increased activity in the radio and gamma-ray bands with morphological changes in the source structure. We discuss the possible link between curvature of the jet and the brightness of the source at high energies.

Key words: galaxies: jets – galaxies: quasars: general – radio continuum: galaxies – gamma rays: theory

Send offprint requests to: S. Britzen (sbritzen@nfra.nl)

© European Southern Observatory (ESO) 1999

Online publication: December 4, 1998

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