FeII strength in NLS1s -- dependence on the viewing angle and FWHM

Abstract

We address the effect of orientation of the accretion disk plane and the geometry of the broad-line region (BLR) in the context of understanding the distribution of quasars along their Main Sequence. We utilize the photoionization code CLOUDY to model the BLR, incorporating the `un-constant' virial factor. We show the preliminary results of the analysis to highlight the co-dependence of the Eigenvector 1 parameter, ${\mathrm{R}}_{\mathrm{FeII}}$ on the broad H$\beta$ FWHM (i.e. the line dispersion) and the inclination angle ($\theta$), assuming fixed values for the Eddington ratio (${\mathrm{L}}_{\mathrm{bol}}/{\mathrm{L}}_{\mathrm{Edd}}$), black hole mass (${\mathrm{M}}_{\mathrm{BH}}$), spectral energy distribution (SED) shape, cloud density (n${}_{\mathrm{H}}$) and composition.

arXiv comment3 pages, 1 figure, Proceedings of the IAU356: Nuclear Activity in Galaxies across Cosmic Time, Addis Ababa, Ethiopia (7-11 October, 2019)

References in corpus (6)

• The diversity of quasars unified by accretion and orientation
• Eigenvector 1: An Optimal Correlation Space for Active Galactic Nuclei
• An Atlas of Computed Equivalent Widths of Quasar Broad Emission Lines
• The Quasar Main Sequence explained by the combination of Eddington ratio, metallicity and orientation
• Modelling of the quasar main sequence in the optical plane
• Main trends of the quasar main sequence -- effect of viewing angle