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Astron. Astrophys. 334, 489-497 (1998)

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Gamma-ray to radio activity and ejection of a VLBI component
in the jet of the S5-quasar 0836+710

K. Otterbein 1, T.P. Krichbaum 1, A. Kraus 1, A.P. Lobanov 1, A. Witzel 1, S.J. Wagner 2 and J.A. Zensus 1

1 Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany
2 Landessternwarte Heidelberg, Königstuhl, D-69117 Heidelberg, Germany

Received 5 February 1998 / Accepted 23 February 1998


Broad-band (gamma to radio) variations of the flux density were observed in the first half of 1992 in the luminous high redshift ([FORMULA]) quasar S5 0836+710 . VLBI monitoring observations during 1993 - 1996 performed at 86 GHz, 22 GHz, 15 GHz, and 8 GHz show the ejection of a new jet component, which most probably is directly related to a quasi simultaneous gamma-, X-ray, optical flaring activity which was observed in February 1992. During the period 1992 - 1993 the flaring propagated through the radio spectrum. From several quasi-simultaneous radio spectra taken during this phase of activity, we determine the time evolution of the spectral turnover of the radio spectrum in the [FORMULA] - [FORMULA] diagram. The data indicate a correlation of the jet activity with the variability of the broad-band electromagnetic spectrum of the source. The observational findings are discussed in the framework of relativistic shock models.

Key words: radio continuum: galaxies – X-rays: galaxies – gamma rays: observations – quasars: general – quasars: individual: S5 0836+710 – galaxies: jets

Present address: Landessternwarte Heidelberg, Königstuhl, D-69117 Heidelberg, Germany

Send offprint requests to: K. Otterbein

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© European Southern Observatory (ESO) 1998

Online publication: May 15, 1998