Multi-frequency VLBA study of the blazar S5 0716+714 during the active state in 2004. I. Inner jet kinematics

E. A. Rastorgueva, K. Wiik, T. Savolainen, L. O. Takalo, E. Valtaoja, Y. N. Vetukhnovskaya, K. V. Sokolovsky

Research output: Contribution to journalArticleScientificpeer-review

Abstract

We observed the blazar 0716+714 with the VLBA during its active state in 2003-2004. In this paper we discuss multi-frequency analysis of the inner jet (first 1 mas) kinematics. The unprecedentedly dense time sampling allows us to trace jet components without misidentification and to calculate the component speeds with good accuracy. In the smooth superluminal jet we were able to identify and track three components over time moving outwards with relatively high apparent superluminal speeds (8.5-19.4 c), which contradicts the hypothesis of a stationary oscillating jet in this source. Component ejections occur at a relatively high rate (once in two months), and they are accompanied by mm-continuum outbursts. Superluminal jet components move along wiggling trajectories, which is an indication of actual helical motion. Fast proper motion and rapid decay of the components suggest that this source should be observed with the VLBI at a rate of at least once in one or two months in order to trace superluminal jet components without confusion.
Original languageEnglish
Pages (from-to)L5-L8
Number of pages4
JournalAstronomy and Astrophysics
Volume494
Issue number2
DOIs
Publication statusPublished - 2009
MoE publication typeA1 Journal article-refereed

Keywords

  • galaxies: active
  • galaxies: BL Lacertae objects: individual: S5 0716+714
  • galaxies: jets

Fingerprint Dive into the research topics of 'Multi-frequency VLBA study of the blazar S5 0716+714 during the active state in 2004. I. Inner jet kinematics'. Together they form a unique fingerprint.

  • Cite this