A4 Refereed article in a conference publication
Fe II velocity shifts in optical spectra of type 1 AGN
Authors: Bon E., Marziani P., Berton M., Bon N., Antonucci R., Gaskell M., Ferland G.
Conference name: Revisiting narrow-line Seyfert 1 galaxies and their place in the Universe
Publisher: Sissa Medialab Srl
Publication year: 2018
Journal: POS Proceedings of Science
Journal name in source: Proceedings of Science
Volume: 328
ISSN: 1824-8039
DOI: https://doi.org/10.22323/1.328.0007
Self-archived copy’s web address: https://research.utu.fi/converis/portal/detail/Publication/44263855
Here we present a critical view of practical problems in the analysis of optical Fe II emission lines of Type 1 AGN spectra. Besides the very complex and unclear physical interpretation of the Fe II template shape, there are other issues that might affect the results of Fe II contribution as well (like the S/N, the AGN continuum component modelling, the complex shapes of other broad and narrow emission lines that are blending in the same part of the spectrum, the galactic host stellar component that could lead to mimicking of the Fe II template shape on some parts of spectrum, etc.). In this paper we concentrate particularly on the claims of possibility that in some objects Fe II could be strongly shifted to the red. We examine the effects in the fitting procedure that could artificially lead to such results.
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