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We consider photometric reverberation mapping, where the nuclear continuumvariations are monitored via a broad-band filter and the echo of emission lineclouds of the broad line region (BLR) is measured with a suitable narrow-band(NB) filter. We investigate how an incomplete emission-line coverage by the NBfilter influences the BLR size determination. This includes two basic cases: 1)a symmetric cut of the blue and red part of the line wings, and 2) the filterpositioned asymmetrically to the line centre so that essentially a completehalf of the emission line is contained in the NB filter. Under the assumptionthat the BLR size is dominated by circular Keplerian orbits, we find thatsymmetric cutting of line wings may lead to overestimating the BLR size by lessthan 5%. The case of asymmetric half-line coverage, similar as for our data ofthe Seyfert 1 galaxy 3C120, yields the BLR size with a bias of less than 1%.Our results suggest that any BLR size bias due to narrow-band line cut inphotometric reverberation mapping is small and in most cases negligible. Weused well sampled photometric reverberation mapping light curves with sharpvariation features in both the continuum and the Hbeta light curves todetermine the geometry type of the Hbeta BLR for 3C120. Modelling of the lightcurve, under the assumption that the BLR is essentially virialised, arguesagainst a spherical geometry and favours a nearly face-on disk-like geometrywith inclination i = 10 +/- 4 deg and extension from 22 to 28 light days. Thelow inclination may lead to a larger black hole mass than the derived whenusing the average geometry scaling factor f=5.5. We discuss deviations ofSeyfert 1 galaxies from the M_BH - sigma relation.

Modelling photometric reverberation data -- a disk-like broad-line region and a potentially larger black hole mass for 3C120