[en] Broad emission lines are the most characteristic features in the spectra of active galaxies. They mostly show either a single-peaked or double-peaked profiles; and originate from a complex dynamics of the likely discrete clouds moving in a spatially extended region so-called Broad Line Region (BLR). We previously showed that our approach to the BLR dynamics based on the dust-driving model of Czerny & Hryniewicz (2011), is appropriate for the low ionized region of the BLR, and it can provide us with the 3D geometry of the BLR. Now, calculating the spectral line generic profiles based on our large grid of simulations of the dynamics of BLR material, we show that the resulted shape of profiles can consistently explain the low ionized broad lines of the mean spectrum of quasars, such as MgII and Hbeta.
