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Previously, we demonstrated that MgII and CIV reverberation-mapped quasars(RM QSOs) are standardizable and that the cosmological parameters inferredusing the broad-line region radius-luminosity (R-L) relation are consistentwith those determined from better-established cosmological probes. With moredata expected from ongoing and future spectroscopic and photometric surveys, itis imperative to examine how new QSO data sets of varied quality, with theirown specific luminosity and time-delay distributions, can be best used todetermine more restrictive cosmological parameter constraints. In this study,we test the effect of adding 25 OzDES MgII RM QSOs as well as 25 lower-qualitySDSS RM CIV QSOs to our previous sample of RM QSOs. Although cosmologicalparameter constraints become tighter after adding these new QSOs, the newcombined data sets have an increased maximum difference in R-L relationparameter values (with a > 2sigma difference in some R-L relation interceptsbetween cosmological models), and thus a lower standardizability for the largerMgII + CIV compilation. Different time-delay methodologies, particularly theICCF and CREAM methods used for inferring time delays of SDSS RM QSOs, slightlyaffect cosmological and R-L relation parameter values, however, the effect isnegligible for (smaller) compilations of robust time-delay detections.

Effects of heterogeneous data sets and time-lag measurement techniques  on cosmological parameter constraints from MgII and CIV reverberation-mapped  quasar data