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Paper: Broad Line Region Structure Along the Eigenvector 1
Volume: 290, Active Galactic Nuclei: from Central Engine to Host Galaxy
Page: 229
Authors: Marziani, P.; Zamanov, R.; Sulentic, J. W.; Dultzin-Hacyan, D.; Bongardo, C.; Calvani, M.
Abstract: We present here the general results from the analysis of spectroscopic observations of 180 AGN. We have considered the spectral region of H-beta and measured FeII, HeII 4686 and H-beta line parameters. Along the so-called Eigenvector 1 sequence (correlation between H-beta broad component width and W(FeII4570)/W(H-beta)) we see that there are clear trends as far as the line profile of the broad component of H-beta is concerned. We discuss the implications of these trends for broad line region models. We also consider the CIV 1549 line as a diagnostic of a high ionization wind. We show that the possibility of having two decoupled regions, namely one emitting low-ionization lines and one emitting high-ionization lines, depends on the AGN location in the Eigenvector 1 sequence. Finally, we discuss the occurrence of a very broad component that may be associated to an optically thin, innermost "very broad line region."
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