期刊论文

Xiaolei Li<&wdkj&>Ryan E Keeley<&wdkj&>Arman Shafieloo

英文

Monthly Notices of the Royal Astronomical Society

0035-8711

2021

507

1

919-926

10.1093/mnras/stab2154

National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [12003006, 11947091, 12021003, 11690023, 11633001, 11920101003, 11373014]; Hebei NSF [A2020205002]; Korea Institute for Advanced Study (KIAS) - Korea government; Beijing Talents Fund of Organization Department of BeijingMunicipal Committee of the CPC; Strategic Priority Research Program of the Chinese Academy of SciencesChinese Academy of Sciences [XDB23000000]; Interdiscipline Research Funds of Beijing Normal University; Key Foreign Expert Program for the Central Universities [X2018002]; Hebei Normal University [L2020B02]; National Key R&D Program of China [2017YFA0402600]

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In this paper, we present a model-independent approach to calibrate the largest quasar sample. Calibrating quasar samples is essentially constraining the parameters of the linear relation between the log  of the ultraviolet (UV) and X-ray luminosities. This calibration allows quasars to be used as standardized candles. There is a strong correlation between the parameters characterizing the quasar luminosity relation and the cosmological distances inferred from using quasars as standardized candles. We break this degeneracy by using Gaussian pr...