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The optical emission lines of type 1 X-ray bright Active Galactic Nuclei

La Mura, G.; Ciroi, S.; Cracco, V. +3 more

A strong X-ray emission is one of the defining signatures of nuclear activity in galaxies. According to the Unified Model for Active Galactic Nuclei (AGN), both the X-ray radiation and the prominent broad emission lines, characterizing the optical and UV spectra of Type 1 AGNs, are originated in the innermost regions of the sources, close to the S…

Are Boltzmann plots of hydrogen Balmer lines a tool for identifying a subclass of S1 AGN?

Popović, L. Č.; La Mura, G.; Ciroi, S. +4 more

It is becoming clear that we can define two different types of nearby AGN belonging to the Seyfert 1 class (S1), on the basis of the match of the intensities of their Broad Balmer Lines (BBL) with the Boltzmann Plots (BP). These two types of S1 galaxies, that we call BP-S1 and NoBP-S1, are characterized, in first approximation, by Broad Line Regio…