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

Khadka, Narayan; Zajaček, Michal; Panda, Swayamtrupta; Martínez-Aldama, Mary Loli; Ratra, Bharat

doi:10.1093/mnras/stac1940

Title: 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

Journal Article · 11 July 2022 · Monthly Notices of the Royal Astronomical Society

DOI: https://doi.org/10.1093/mnras/stac1940 · OSTI ID:1880383

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ABSTRACT 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 $${\cal R}_{\rm {Fe\, {\small II}}}$$ (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-$${\cal R}_{\rm {Fe\, {\small II}}}$$ and high-$${\cal R}_{\rm {Fe\, {\small II}}}$$ 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 β QSOs.

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Research Organization:: Kansas State University, Manhattan, KS (United States)

Sponsoring Organization:: National Council for Scientific and Technological Development (CNPq); Polish Funding Agency National Science Centre; USDOE; USDOE Office of Science (SC)

Grant/Contract Number:: SC0011840

OSTI ID:: 1880383

Journal Information:: Monthly Notices of the Royal Astronomical Society, Journal Name: Monthly Notices of the Royal Astronomical Society Journal Issue: 3 Vol. 515; ISSN 0035-8711

Publisher:: Oxford University PressCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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Understanding Broad Mg ii Variability in Quasars with Photoionization: Implications for Reverberation Mapping and Changing-look Quasars Guo, Hengxiao; Shen, Yue; He, Zhicheng The Astrophysical Journal, Vol. 888, Issue 2 https://doi.org/10.3847/1538-4357/ab5db0	journal	January 2020
Time-delay Measurement of Mg ii Broad-line Response for the Highly Accreting Quasar HE 0413-4031: Implications for the Mg ii–based Radius–Luminosity Relation Zajaček, Michal; Czerny, Bożena; Martinez–Aldama, Mary Loli The Astrophysical Journal, Vol. 896, Issue 2 https://doi.org/10.3847/1538-4357/ab94ae	journal	June 2020
Quasar Main Sequence in the UV Plane Śniegowska, Marzena; Kozłowski, Szymon; Czerny, Bożena The Astrophysical Journal, Vol. 900, Issue 1 https://doi.org/10.3847/1538-4357/aba620	journal	September 2020
The Sloan Digital Sky Survey Reverberation Mapping Project: Mg ii Lag Results from Four Years of Monitoring Homayouni, Y.; Trump, Jonathan R.; Grier, C. J. The Astrophysical Journal, Vol. 901, Issue 1 https://doi.org/10.3847/1538-4357/ababa9	journal	September 2020
The Sloan Digital Sky Survey Reverberation Mapping Project: How Broad Emission Line Widths Change When Luminosity Changes Wang, Shu; Shen, Yue; Jiang, Linhua The Astrophysical Journal, Vol. 903, Issue 1 https://doi.org/10.3847/1538-4357/abb36d	journal	October 2020
Scatter Analysis along the Multidimensional Radius–Luminosity Relations for Reverberation-mapped Mg ii Sources Martínez–Aldama, Mary Loli; Zajaček, Michal; Czerny, Bożena The Astrophysical Journal, Vol. 903, Issue 2 https://doi.org/10.3847/1538-4357/abb6f8	journal	November 2020
Eppur è piatto? The Cosmic Chronometers Take on Spatial Curvature and Cosmic Concordance Vagnozzi, Sunny; Loeb, Abraham; Moresco, Michele The Astrophysical Journal, Vol. 908, Issue 1 https://doi.org/10.3847/1538-4357/abd4df	journal	February 2021
Time Delay of Mg ii Emission Response for the Luminous Quasar HE 0435-4312: toward Application of the High-accretor Radius–Luminosity Relation in Cosmology Zajaček, Michal; Czerny, Bożena; Martinez–Aldama, Mary Loli The Astrophysical Journal, Vol. 912, Issue 1 https://doi.org/10.3847/1538-4357/abe9b2	journal	April 2021
Standardized Long Gamma-Ray Bursts as a Cosmic Distance Indicator Wang, F. Y.; Hu, J. P.; Zhang, G. Q. The Astrophysical Journal, Vol. 924, Issue 2 https://doi.org/10.3847/1538-4357/ac3755	journal	January 2022
Cosmological Constraints on Nonflat Exponential f(R) Gravity Geng, Chao-Qiang; Hsu, Yan-Ting; Lu, Jhih-Rong The Astrophysical Journal, Vol. 926, Issue 1 https://doi.org/10.3847/1538-4357/ac4495	journal	February 2022
Exploring the Hubble Tension and Spatial Curvature from the Ages of Old Astrophysical Objects Wei, Jun-Jie; Melia, Fulvio The Astrophysical Journal, Vol. 928, Issue 2 https://doi.org/10.3847/1538-4357/ac562c	journal	April 2022
Quasar Standardization: Overcoming Selection Biases and Redshift Evolution Dainotti, Maria Giovanna; Bargiacchi, Giada; Lenart, Aleksander Łukasz The Astrophysical Journal, Vol. 931, Issue 2 https://doi.org/10.3847/1538-4357/ac6593	journal	May 2022
The Sloan Digital Sky Survey Reverberation Mapping Project: Sample Characterization Shen, Yue; Hall, Patrick B.; Horne, Keith The Astrophysical Journal Supplement Series, Vol. 241, Issue 2 https://doi.org/10.3847/1538-4365/ab074f	journal	April 2019
Investigating Cosmic Discordance Di Valentino, Eleonora; Melchiorri, Alessandro; Silk, Joseph The Astrophysical Journal Letters, Vol. 908, Issue 1 https://doi.org/10.3847/2041-8213/abe1c4	journal	February 2021

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Title: 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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