Schematic illustration of an AGN being both a quasar (luminous thermal emission from the accretion disc) and a blazar (even more luminous non-thermal emission from the relativistic jet), i.e. an FSRQ like 3C 454.3. It is assumed here that the BLR is concentrated along the accretion disc plane at characteristic distance RBLR from the SMBH. The optical continuum is dominated by the synchrotron radiation produced in a blazar zone located within the jet at characteristic distance rblazar, and the Mg II BEL is produced in the BLR.
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