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Broad lines in active galaxies are primarily emitted by photoionizationprocesses that are driven by the incident continuum arising from a complexgeometrical structure circumscribing the supermassive black hole. A model ofthe broad-band spectral energy distribution (SED) effective in ionizing thegas-rich broad line emitting region (BLR) is needed to understand the variousradiative processes that eventually lead to the emission of emission lines fromdiverse physical conditions. Photoionization codes are a useful tool toinvestigate two aspects - the importance of the shape of the SED, and thephysical conditions in the BLR. In this work, we focus on the anisotropy ofcontinuum radiation from the very centre a direct consequence of thedevelopment of a funnel-like structure at regions very close to the black hole.Accounting for the diversity of Type-1 active galactic nuclei (AGNs) in thecontext of the main sequence of quasars permits us to locate the superEddington sources along the sequence and constrain the physical conditions oftheir line-emitting BLR.

Modelling the quasar spectra for super-Eddington sources -- The What, the Why and the How