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The distributions of L(oiii 5007), black hole (BH) mass and L/L(Edd) in twolarge samples of type-I and type-II active galactic nuclei (AGNs) are comparedin order to test the suggestion that radiation pressure force is affecting thegas velocity in the broad line region and hence the BH mass determination. Thesamples are drawn from the SDSS archive and are modified to represent the sameparent distribution at 0.1 < z < 0.2. BH masses in type-I sources arecalculated in two different ways, one using a simple virial mass assumption andthe other by taking into account the effect of radiation pressure force on thegas. The simple virial mass estimate results in good agreement with thesigma*-based BH mass and L/L(Edd) estimates in type-II sources. In contrast,there is a clear disagreement in the L/L(Edd) distributions when radiationpressure-based estimates are used. This indicates that radiation pressure forceis not important in 0.1 < z < 0.2 AGNs with L(5100)=10^{42.8-44.8} erg/s. Thishas important implications to the physics of the gas producing the broademission lines in AGNs, in particular the existence of extremely large (about10^24 cm^(-2)) column density clouds.

Radiation pressure force and black hole mass determination in low redshift type-I and type-II active galactic nuclei