| KHADKA, Narayan, Zhefu YU, Michal ZAJAČEK, Mary Loli MARTINEZ-ALDAMA, Bożena CZERNY a Bharat RATRA. Standardizing reverberation-measured Mg II time-lag quasars, by using the radius–luminosity relation, and constraining cosmological model parameters. Monthly Notices of the Royal Astronomical Society. Oxford University Press, 2021, roč. 508, č. 4, s. 4722-4737. ISSN 0035-8711. Dostupné z: https://dx.doi.org/10.1093/mnras/stab2807. |
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@article{1800957,
author = {Khadka, Narayan and Yu, Zhefu and Zajaček, Michal and MartinezandAldama, Mary Loli and Czerny, Bożena and Ratra, Bharat},
article_number = {4},
doi = {http://dx.doi.org/10.1093/mnras/stab2807},
keywords = {cosmological parameters; cosmology: observations; dark energy; quasars: emission lines},
language = {eng},
issn = {0035-8711},
journal = {Monthly Notices of the Royal Astronomical Society},
title = {Standardizing reverberation-measured Mg II time-lag quasars, by using the radius–luminosity relation, and constraining cosmological model parameters},
url = {https://doi.org/10.1093/mnras/stab2807},
volume = {508},
year = {2021}
}
TY - JOUR
ID - 1800957
AU - Khadka, Narayan - Yu, Zhefu - Zajaček, Michal - Martinez-Aldama, Mary Loli - Czerny, Bożena - Ratra, Bharat
PY - 2021
TI - Standardizing reverberation-measured Mg II time-lag quasars, by using the radius–luminosity relation, and constraining cosmological model parameters
JF - Monthly Notices of the Royal Astronomical Society
VL - 508
IS - 4
SP - 4722-4737
EP - 4722-4737
PB - Oxford University Press
SN - 00358711
KW - cosmological parameters
KW - cosmology: observations
KW - dark energy
KW - quasars: emission lines
UR - https://doi.org/10.1093/mnras/stab2807
N2 - We use 78 reverberation-measured Mg II time-lag quasars (QSOs) in the redshift range 0.0033 ≤ z ≤ 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 ΛCDM 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.
ER -
KHADKA, Narayan, Zhefu YU, Michal ZAJAČEK, Mary Loli MARTINEZ-ALDAMA, Bo$\backslash$.zena CZERNY a Bharat RATRA. Standardizing reverberation-measured Mg II time-lag quasars, by using the radius–luminosity relation, and constraining cosmological model parameters. \textit{Monthly Notices of the Royal Astronomical Society}. Oxford University Press, 2021, roč.~508, č.~4, s.~4722-4737. ISSN~0035-8711. Dostupné z: https://dx.doi.org/10.1093/mnras/stab2807.
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