The CaFe Project: Optical Fe II and Near-infrared Ca II Triplet Emission in Active Galaxies. II. The Driver(s) of the Ca II and Fe II and Its Potential Use as a Chemical Clock

In this second paper in the series, we carefully analyze observational properties of optical FeII and NIR CaII triplet Active Galactic Nuclei, as well luminosity, black hole mass, Eddington ratio order to define driving mechanism behind our sample. The shows an inverse Baldwin effect, bringing out particular behavior ion with respect other low-ionization lines such H$\beta$. We performed a Principal Component Analysis, where 81.2% variance can be explained by first three principal components drawn from FWHMs, equivalent widths. component (PC1) is primarily driven combination mass luminosity significance over 99.9%, which turn reflected strong correlation PC1 ratio. correlations are better represented ratio, thus it could primary observed CaII-FeII Since calcium belongs $\alpha$-elements, FeII/CaII flux used chemical clock for determining metal content AGN trace evolution host galaxies. confirm de-enhancement suggesting enrichment BLR intermediate-$z$ low-$z$ objects. A larger sample, particularly at $z$>2, needed present results.