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Gaskell et al. (2007) introduced polarization reverberation mapping as a newtechnique to explore the structure of active galactic nuclei. We presentmodeling results for the time-dependent polarization signal expected fromscattering inside a centrally illuminated spheroid. Such a model setupdescribes a larger corona surrounding the compact source of an active nucleus.Time-delays between the polarized and the total flux are computed and relatedto the geometry of the cloud and the viewing angle. When including the in-flowdynamics of the cloud, it is possible to constrain its optical depth andvelocity, which enables estimations of the mass inflow rate.

How Polarization and Scattering can reveal Geometries, Dynamics, and Feeding of Active Galactic Nuclei