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arXiv 2107.07600astro-ph.COgr-qchep-phhep-th
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类星体X射线和UV通量的测量是否为宇宙学模型提供了有用的检验?

Do quasar X-ray and UV flux measurements provide a useful test of cosmological models?

Narayan Khadka, Bharat Ratra

摘要:

最近的类星体(QSO)X射线和紫外线通量测量的汇编包括似乎不能通过X射线光度和紫外线光度($L_X-L_{UV}$)的关系,所以不应该被用来约束宇宙学模型参数的QSO。在这里,我们表明,最大的七个子样本在这个汇编,SDSS-4XMM类星体,贡献了约2/3的类星体总数,有$L_X-L_{UV}$关系,依赖于宇宙模型假设,也对红移,是类似的问题的主要原因,早期发现的完整的类星体汇编。第二和第三大的子样本,SDSS-Chandra和XXL类星体,共同贡献了大约30%的类星体总数,似乎是可解释的,但只提供了弱约束的宇宙学参数,这与标准的空间平坦的$Λ$ CDM模型或来自更好的宇宙学探测器的约束并不矛盾。

英文摘要:

The recent compilation of quasar (QSO) X-ray and UV flux measurements include QSOs that appear to not be standardizable via the X-ray luminosity and UV luminosity ($L_X-L_{UV}$) relation and so should not be used to constrain cosmological model parameters. Here we show that the largest of seven sub-samples in this compilation, the SDSS-4XMM QSOs that contribute about 2/3 of the total QSOs, have $L_X-L_{UV}$ relations that depend on the cosmological model assumed and also on redshift, and is the main cause of the similar problem discovered earlier for the full QSO compilation. The second and third biggest sub-samples, the SDSS-Chandra and XXL QSOs that together contribute about 30% of the total QSOs, appear standardizable, but provide only weak constraints on cosmological parameters that are not inconsistent with the standard spatially-flat $Λ$CDM model or with constraints from better-established cosmological probes.

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