Standardizing reverberation-measured Mg II time-lag quasars, by using the radius–luminosity relation, and constraining cosmological model parameters
| Autor: | Bharat Ratra, Mary Loli Martínez-Aldama, Michal Zajaček, Zhefu Yu, Narayan Khadka, Bozena Czerny |
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| Rok vydání: | 2021 |
| Předmět: |
High Energy Physics - Theory
QSOS Cosmology and Nongalactic Astrophysics (astro-ph.CO) FOS: Physical sciences General Relativity and Quantum Cosmology (gr-qc) Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics 01 natural sciences General Relativity and Quantum Cosmology Luminosity symbols.namesake High Energy Physics - Phenomenology (hep-ph) 0103 physical sciences 010303 astronomy & astrophysics Physics 010308 nuclear & particles physics Astronomy and Astrophysics Quasar Radius Redshift Baryon High Energy Physics - Phenomenology High Energy Physics - Theory (hep-th) 13. Climate action Space and Planetary Science symbols Dark energy Astrophysics - Cosmology and Nongalactic Astrophysics Hubble's law |
| Zdroj: | Monthly Notices of the Royal Astronomical Society. 508:4722-4737 |
| ISSN: | 1365-2966 0035-8711 |
| DOI: | 10.1093/mnras/stab2807 |
| Popis: | We use 78 reverberation-measured Mg II time-lag quasars (QSOs) in the redshift range $0.0033 \leq z \leq 1.89$ to constrain cosmological parameters in six different cosmological models. The basis of our method is the use of the radius-luminosity or $R-L$ relation to standardize these 78 Mg II QSOs. In each cosmological model we simultaneously determine $R-L$ relation and cosmological model parameters, thus avoiding the circularity problem. We find that the $R-L$ relation parameter values are independent of the cosmological model used in the analysis thus establishing that current Mg II QSOs are standardizable candles. Cosmological constraints obtained using these QSOs are significantly weaker than, but consistent with, those obtained from a joint analysis of baryon acoustic oscillation (BAO) observations and Hubble parameter [$H(z)$] measurements. So, we also analyse these QSOs in conjunction with the BAO + $H(z)$ data and find cosmological constraints consistent with the standard spatially-flat $\Lambda$CDM model as well as with mild dark energy dynamics and a little spatial curvature. A larger sample of higher-quality reverberation-measured QSOs should have a smaller intrinsic dispersion and so should provide tighter constraints on cosmological parameters. Comment: 16 pages, 11 figure, Mg II QSO data are given, MNRAS accepted version. arXiv admin note: text overlap with arXiv:2105.12692 |
| Databáze: | OpenAIRE |
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