Active galactic nuclei with strong Fe line emission

Marzena Śniegowska, Bożena Czerny and Swayamtrupta Panda

The SDSS catalogs contain 300,000 well studied quasars. Good optical spectroscopy is available for these objects. Eigenvector 1 (EV1) is a formal parameter that puts in order the properties of the unobscured type 1 active galaxies and the leading term in EV1 is the parameter R_Fe: the ratio of the equivalent widths (EW) of the Fe II to Hβ lines. We aim at the understanding of the nature of this parameter. We selected 27 appropriate sources with the R_Fe larger than 1.3 in the SDSS quasar catalog of Shen et al. (2011). We performed detailed modelling of the above lines including various templates for the Fe II pseudo-continuum and the starlight contribution to the spectrum. Newly fitted values of R_Fe for most considered sources are now around 1, which stresses the advantage of high quality spectral analysis. We discussed in details the physical properties of the objects, which in our analysis are still extreme with respect to EV1.

Proceedings of the Polish Astronomical Society, vol. 7, 258-260 (2018)

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