通过探测成员星系增强透镜星系团中时延宇宙学的能力. II. 宇宙计时器
Augmenting the power of time-delay cosmography in lens galaxy clusters by probing their member galaxies. II. Cosmic chronometers
AI总结：
提出结合透镜星系团时延宇宙学与“宇宙计时器”成员星系探测的新方法，实现对Hubble常数等宇宙学参数的稳健准确测量并打破参数简并。
摘要：
我们提出了一种测量宇宙膨胀率和几何结构的新方法，该方法通过探测成员星系，将透镜星系团中的时延宇宙学与纯净的“宇宙计时器”（CCs）样本相结合。前者利用被星系团强透镜效应成像的时变源多重像之间测得的时延，而后者则利用质量最大且最被动的星系团成员星系来测量宇宙的微分时间演化。我们采用了两种不同的统计技术，对测得量设定了真实的误差，以评估宇宙学参数值的准确性和精度增益。我们证明，所提出的组合方法能够对Hubble常数值进行稳健且准确的测量。此外，由于两种不同探针在打破参数简并性方面具有互补性，该方法还为其他宇宙学参数提供了宝贵的信息。最后，我们利用几个透镜星系团现有的高质量光谱光度数据，展示了所提出的联合方法的即时观测可行性。
英文摘要：
We present a novel approach to measuring the expansion rate and the geometry of the Universe, which combine time-delay cosmography in lens galaxy clusters with pure samples of 'cosmic chronometers' (CCs) by probing the member galaxies. The former makes use of the measured time delays between the multiple images of time-varying sources strongly lensed by galaxy clusters, while the latter exploits the most massive and passive cluster member galaxies to measure the differential time evolution of the Universe. We applied two different statistical techniques, adopting realistic errors on the measured quantities, to assess the accuracy and the gain in precision on the values of the cosmological parameters. We demonstrate that the proposed combined method allows for a robust and accurate measurement of the value of the Hubble constant. In addition, this provides valuable information on the other cosmological parameters thanks to the complementarity between the two different probes in breaking parameter degeneracies. Finally, we showcase the immediate observational feasibility of the proposed joint method by taking advantage of the existing high-quality spectro-photometric data for several lens galaxy clusters.
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