Titlebook: Variability of Active Galaxies; Proceedings of a Wor Wolfgang J. Duschl,Stefan J. Wagner,Max Camenzind Conference proceedings 1991 Springer

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BLR models and the L-M relation for AGNs,r function for the NGC 4151 Hß line, are the best evidences for the existence of a thick geometry in those objects. The complications due to the non-linear response of several emission lines are also discussed, and a preliminary L-M relation is suggested.

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Meteorology of the broad line region,een the variability behaviour of an emission line and the shape of its profile. Computer simulations are presented which illustrate the evolution of the line profile in response to a ‘realistic’ continuum light curve.

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Variability of BL Lac objects in the radio regime,PQ - HPQ population; sources aligned to a few degrees with our line of sight. The other BL Lac population consists of much less boosted, moderately variable, nearby FR I radio galaxies beamed towards us.

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Conference proceedings 1991 between line and continuum variability, with observational results, methodological approaches, and theoretical models accompanying each. The final part is devoted to the important aspect of propagation-induced variability.