Issue |
A&A
Volume 433, Number 3, April III 2005
|
|
---|---|---|
Page(s) | 815 - 825 | |
Section | Extragalactic astronomy | |
DOI | https://doi.org/10.1051/0004-6361:20040388 | |
Published online | 29 March 2005 |
Kinematic study of the blazar S5 0716+714
1
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany e-mail: bach@to.astro.it
2
Landessternwarte, Königstuhl 17, 69117 Heidelberg, Germany
3
National Astronomical Observatories, CAS, 20A Datun, Road Chaoyang, Beijing 100012, PR China
Received:
4
March
2004
Accepted:
3
December
2004
We present the results of a multi-frequency study
of the structural evolution of the VLBI jet in the BL Lac object
0716+714 over the last 10 years. We show VLBI images obtained at
5 GHz, 8.4 GHz, 15 GHz and 22 GHz. The milliarcsecond source
structure is best described by a one-sided core-dominated jet of 10 mas length. Embedded jet components move superluminally with
speeds ranging from
to
(assuming
). Such fast superluminal
motion is not typical of BL Lac objects, however it is still in the range of jet
speeds typically observed in quasars (
to
). In 0716+714, younger
components that were ejected more recently seem to move
systematically slower than the older components. This and a systematic
position angle variation of the inner (1 mas) portion of the VLBI jet suggests
an at least partly geometric origin of the observed velocity variations. The
observed rapid motion and the derived Lorentz factors are discussed with regard
to the rapid Intra-Day Variability (IDV) and the γ-ray
observations, from which very high Doppler factors are inferred.
Key words: galaxies: jets / galaxies: BL Lacertae objects: individual: S5 0716+714 / radio continuum: galaxies
© ESO, 2005
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