GAMMA-RAY TO RADIO ACTIVITY AND EJECTION OF A VLBI COMPONENT IN THE JET OF THE S5-QUASAR-0836+710

Broad-band (gamma to radio) variations of the flux density were observ ed in the first half of 1992 in the luminous high redshift (z = 2.172) quasar S5 0836+710. VLBI moni toring 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 observe d in February 1992. During the period 1992 - 1993 the flaring propagat ed through the radio spectrum. From several quasi-simultaneous radio s pectra taken during this phase of activity, we determine the time evol ution of the spectral turnover of the radio spectrum in the S-m-nu(m) 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 relativis tic shock models.