Consistency study of high- and low-accreting Mg ii quasars: No significant effect of the Fe ii to Mg ii flux ratio on the radius-luminosity relation dispersion
Abstract
We use observations of 66 reverberation-measured \ quasars (QSOs) in the redshift range 0.36 ≤ z ≤ 1.686 -- a subset of the 78 QSOs we previously studied that also have \ (flux ratio parameter of UV \ to \ that is used as an accretion-rate proxy) measurements -- to simultaneously constrain cosmological model parameters and QSO 2-parameter and 3-parameter radius-luminosity (R-L) relation parameters in six different cosmological models. We find that these QSO R-L relation parameters are independent of the assumed cosmological model and so these QSOs are standardizable through the R-L relations. Also: (1) With the 2-parameter R-L relation, we find that the low-\ and high-\ data subsets obey the same R-L relation within the error bars. (2) Extending the 2-parameter R-L relation to a 3-parameter one does not result in the hoped-for reduction in the intrinsic dispersion of the R-L relation. (3) Neither of the 3-parameter R-L relations provide a significantly better fit to the measurements than does the 2-parameter R-L relation. These are promising results for the on-going development of \ cosmological probes. The first and third of these results differ significantly from those we found elsewhere from analyses of reverberation-measured \ QSOs.
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