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AGN reverberate when the broad emission lines respond to changes of theionizing thermal continuum emission. Reverberation measurements have beencommonly used to estimate the size of the broad-line region (BLR) and the massof the central black hole. However, reverberation mapping studies have beenmostly performed on radio-quiet sources where the contribution of the jet canbe neglected. In radio-loud AGN, jets and outflows may affect substantially therelation observed between the ionizing continuum and the line emission. Toinvestigate this relation, we have conducted a series of multiwavelengthstudies of radio-loud AGN, combining optical spectral line monitoring withregular VLBI observations. Our results suggest that at least a fraction of thebroad-line emitting material can be located in a sub-relativistic outflowionized by non-thermal continuum emission generated in the jet at largedistances (> 1pc) from the central engine of AGN. This finding may have astrong impact on black hole mass estimates based on measured widths of thebroad emission lines and on the gamma-ray emission mechanisms.

The link between broad emission line fluctuations and non-thermal emission from the inner AGN jet