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arXiv 1104.2497astro-ph.CO
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距离-对偶关系与星系团和Ia型超新星的一致性检验

A Consistent Test of the Distance-Duality Relation with Galaxy Clusters and Type Ia Supernave

Nan Liang, Zhengxiang Li, Puxun Wu, Shuo Cao, Kai Liao, Zong-Hong Zhu

摘要:

本文提出了一种新的一致性方法来检验距离-对偶关系,该关系将角直径距离(DA)与光度距离(DL)以一种与宇宙学无关的方式联系起来。为了避免星系团与Ia型星系团(SNe Ia)红移不重合带来的偏差,同时也为了保证星系团样本的完整性,我们利用邻近的SNe Ia进行插值,得到了某个SNe Ia点与相应的星系团红移相同时的光度距离。利用38个完整星系团球形模型样本的观测数据和Union 2集内插的校正光度距离,在相同的角直径距离红移下,我们发现对于$η(z)$的各种参数化,$η\equiv {D_L}{(1+z)}^{-2}/{D_A}=1$在$2σ$置信水平内是满足的,这比以前不考虑红移偏差的检验结果更加严格.

英文摘要:

We propose a new consistent method to test of the distance-duality (DD) relation which related angular diameter distances (DA) to the luminosity distances (DL) in a cosmology-independent way. In order to avoid any bias brought by redshift incoincidence between galaxy clusters and Type Ia Supernave (SNe Ia), as well as to ensure the integrity of the galaxy clusters samples, we obtain the luminosity distance of a certain SN Ia point at the same redshift of the corresponding galaxy cluster by interpolating from the nearby SNe Ia. With the observational data at the same redshifts of the angular diameter distances from the complete 38 galaxy cluster sample for the spherical model and the corrected luminosity distances interpolated from the Union2 set, we find that $η\equiv {D_L}{(1+z)}^{-2}/{D_A}=1$ is satisfied within $2σ$ confidence level for various parameterizations of $η(z)$, which are more stringent than previous testing results without considering redshift bias.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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