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Broad emission lines are the most characteristic features in the spectra ofactive galaxies. They mostly show either a single-peaked or double-peakedprofiles; and originate from a complex dynamics of the likely discrete cloudsmoving in a spatially extended region so-called Broad Line Region (BLR). Wefollow a non-hydrodynamical single-cloud approach to the BLR dynamics based onthe dust-driving model of Czerny & Hryniewicz. We previously showed in detailsthat the 2.5D version of the model could provide us with the 3D geometry of theBLR. In this paper, we provide a large grid of results based on which we aim attesting the model with calculation of the spectral line generic profiles. Weshow that the shape of profiles not only depends on the accretion rate of thesource, the black hole mass, and the viewing angle, but also it is mostsignificantly affected by the adopted dust-to-gas mass ratio that regulates thestrength of the radiation pressure. We also show that the model canappropriately explain the low ionized broad emission lines of the mean spectrumof quasars, such as MgII and Hbeta.

Radiation pressure on dust explains the Low Ionized Broad Emission Lines in Active Galactic Nuclei