SIMBAD references

In this paper we report the insights on the nature on the γ-ray quasar 0528+134, which we obtained from a multifrequency radio monitoring program. The radio observations were made with the Effelsberg 100-m telescope and the IRAM 30-m telescope between 1992 and 1996, and with the Green Bank Interferometer between 1992 and 1993. In this paper we also summarize the findings from VLBI observations up to now. The VLBI structure of 0528+134 typically shows a one-sided core jet structure of ∼ 5 mas length. At least one component shows apparent superluminal motion with β_app=4.4±1.7 (H₀=100km/s/Mpc, q₀=0.5). Superluminal motion is expected since strong Doppler boosting in this source is required in view of the γ-ray luminosity and the variability timescale, which violate the compactness limit. In summer 1993 we observed a major outburst at all frequencies above a few GHz, which peaked a few months after a strong outburst in high energy γ-rays and showed the canonical time evolution of a cooling and/or expanding electron distribution. In late 1995 the strongest ever observed radio outburst occurred, reaching the highest flux level of S=11.9±0.15Jy at 32GHz on 12/8/95. Though 0528+134 has been repeatedly observed by EGRET during 1995, no similar chart-breaking γ-ray outburst has been reported. Our data indicate that there is no one-to-one relation between the γ-ray brightness and the radio flux level a short time later.