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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0075-8450 ly divided 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.978-3-662-13825-0978-3-540-46325-2Series ISSN 0075-8450 Series E-ISSN 1616-6361

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Variability of line profiles in NGC 5548,n. The H. and H. difference profiles show strong variations. The broad line difference profiles consist of three components. The main component is centered at the same wavelength as the narrow component. The intensity of this component is correlated with the UV continuum. It is symmetric and has con

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Continuum variability in NGC 5548: Implications for theoretical models,y of less than 4 days. We examine this result in the context of accretion disk theory. In the first part the standard a-disk model is discussed. The effects connected with heating of the outer regions by radiation from the inner regions are also considered. Neither scenario lends itself to a simple