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

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Authors

KHADKA Narayan ZAJAČEK Michal PANDA Swayamtrupta MARTÍNEZ-ALDAMA Mary Loli RATRA Bharat

Year of publication 2022
Type Article in Periodical
Magazine / Source Monthly Notices of the Royal Astronomical Society
MU Faculty or unit

Faculty of Science

Citation
Web
Doi http://dx.doi.org/10.1093/mnras/stac1940
Keywords quasars: emission lines; cosmological parameters; dark energy; cosmology: observations
Description We use observations of 66 reverberation-measured Mg?II quasars (QSOs) in the redshift range 0.36 ? z ? 1.686 – a subset of the 78 QSOs we previously studied that also have RFeII (flux ratio parameter of UV Fe?II to Mg?II that is used as an accretion-rate proxy) measurements – to simultaneously constrain cosmological model parameters and QSO two-parameter and three-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 two-parameter R–L relation, we find that the low-RFeII and high-RFeII data subsets obey the same R–L relation within the error bars. (2) Extending the two-parameter R–L relation to a three-parameter one does not result in the hoped-for reduction in the intrinsic dispersion of the R–L relation. (3) Neither of the three-parameter R–L relations provide a significantly better fit to the measurements than does the two-parameter R–L relation. These are promising results for the ongoing development of Mg?II cosmological probes. The first and third of these results differ significantly from those we found elsewhere from analyses of reverberation-measured H?ß QSOs.
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