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A generalized approach to reverberation mapping (RM) is presented, which isapplicable to broad- and narrow-band photometric data, as well as tospectroscopic observations. It is based on multivariate correlation analysistechniques and, in its present implementation, is able to identifyreverberating signals across the accretion disk and the broad line region (BLR)of active galactic nuclei (AGN). Statistical tests are defined to assess thesignificance of time-delay measurements using this approach, and thelimitations of the adopted formalism are discussed. It is shown how additionalconstraints on some of the parameters of the problem may be incorporated intothe analysis thereby leading to improved results. When applied to a sample of14 Seyfert 1 galaxies having good-quality high-cadence photometric data,accretion disk scales and BLR sizes are simultaneously determined, on acase-by-case basis, in most objects. The BLR scales deduced here are in goodagreement with the findings of independent spectroscopic RM campaigns.Implications for the photometric RM of AGN interiors in the era of largesurveys are discussed.

Quasar Cartography: from Black Hole to Broad Line Region Scales