We use six different cosmological models to study the recently released compilation of X-ray and UV flux measurements of 2038 quasars (QSOs) which span the redshift range 0.009 ≤ z ≤ 7.5413. We find, for the full QSO data set, that the parameters of the X-ray and UV luminosities LX−LUV relation used to standardize these QSOs depend on the cosmological model used to determine these parameters, i.e. it appears that the full QSO data set includes QSOs that are not standardized and so cannot be used for the purpose of constraining cosmological parameters. Subsets of the QSO data, restricted to redshifts z ≲ 1.5–1.7 obey the LX−LUV relation in a cosmological-model-independent manner, and so can be used to constrain cosmological parameters. The cosmological constraints from these lower z, smaller QSO data subsets are mostly consistent with, but significantly weaker than, those that follow from baryon acoustic oscillation and Hubble parameter measurements.

中文翻译：

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确定类星体 X 射线和紫外线通量测量的有效范围以约束宇宙学模型参数

我们使用六种不同的宇宙学模型来研究最近发布的 2038 个类星体 (QSO) X 射线和紫外线通量测量的汇编，其红移范围为 0.009 ≤ z ≤ 7.5413。我们发现，对于完整的 QSO 数据集，用于标准化这些 QSO 的 X 射线和紫外光度 LX-LUV 关系的参数取决于用于确定这些参数的宇宙学模型，即似乎完整的 QSO 数据集包括未标准化的 QSO，因此不能用于限制宇宙学参数。QSO 数据的子集，仅限于红移 z ≲ 1.5–1.7，以与宇宙模型无关的方式服从 LX-LUV 关系，因此可用于约束宇宙参数。来自这些较低 z、较小 QSO 数据子集的宇宙学约束大多符合：