基于Ia型超新星-类星体联合宇宙学重建得到的测光活动星系核（AGN）黄金样本确定哈勃常数H₀
Determination of $H_{0}$ with a Photometric AGN Golden Sample derived from a joint SN Ia-QSO cosmological reconstruction
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中文总结 AI 辅助
针对哈勃常数H₀的早期-晚期宇宙测定张力，结合Ia型超新星与SDSS DR14类星体，经统计筛选构建AGN黄金样本，测得H₀并验证样本可靠性，为高红移距离示踪剂研发提供支撑。
中文摘要 AI 辅助
当前早期宇宙与晚期宇宙测定的哈勃常数H₀之间存在张力，推动了独立高红移距离示踪剂的研发。类星体作为明亮的活动星系核（AGN），可通过其X射线与紫外波段的经验关系提供有前景的途径。我们构建了Ia型超新星-类星体联合哈勃图，研究经统计筛选的类星体子样本是否能为未来AGN标准化定义初步黄金样本。我们结合校准后的Ia型超新星与SDSS DR14类星体，从联合模型的后验分布中推断宇宙学参数，从边际分布得到后验中位数与可信区间。我们进一步从SDSS查询中定义依赖红移的类星体池，采用基于红移、光学星等和SDSS颜色的多元统计距离准则，在每个红移区间内选择最具代表性的源。后验分析得出H₀ = 71.76⁺¹·⁶⁷₋₁·³¹ km s⁻¹ Mpc⁻¹，Ωₘ = 0.294⁺⁰·⁰¹⁴₋₀·⁰¹²。经统计筛选的类星体候选体在多个红移区间内以小残差弥散重现参考哈勃图，且在SDSS角覆盖范围内广泛分布，无选择过程诱导的强人为聚类证据。
英文摘要
The current tension between early and late-Universe determinations of the Hubble constant motivates the development of independent high-redshift distance tracers. Quasars, as luminous active galactic nuclei - AGNs, provide a promising route through the empirical relation between their X-ray and ultraviolet luminosities.We construct a joint Type Ia supernova-quasar Hubble diagram and investigate whether a statistically selected quasar subsample can define a preliminary golden sample for future AGN standardization. We combine calibrated Type Ia supernovae with SDSS DR14 quasars and infer the cosmological parameters from the posterior distribution of a joint model. Posterior medians and credible intervals are obtained from the marginalized distributions. We further define redshift-dependent quasar pools from SDSS queries and select the most representative sources in each bin using a multivariate statistical-distance criterion based on redshift, optical magnitudes, and SDSS colors. The posterior analysis yields $H_0 = 71.76^{+1.67}_{-1.31}\,\mathrm{km\,s^{-1}\,Mpc^{-1}}$ and $Ω_m = 0.294^{+0.014}_{-0.012}$. The statistically selected quasar candidates reproduce the reference Hubble diagram with small residual dispersion across multiple redshift intervals and remain broadly distributed across the SDSS angular footprint without evidence of strong artificial clustering induced by the selection procedure.
