A consistent test of the distance-duality relation with galaxy clusters and Type Ia Supernovae

A consistent test of the distance-duality relation with galaxy clusters and Type Ia Supernovae
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星系团和 Ia 型超新星距离对偶关系的一致检验

DOI:
10.1093/mnras/stt1589
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发表时间:
2011-04
影响因子:
4.8
通讯作者:
Zonghong Zhu
Zonghong Zhu
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Kai Liao;Kai Liao;Zonghong Zhu;Zonghong Zhu

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本文提出了一种新的一致性方法来检验角直径距离(D-A)与光度距离(D-L)之间的距离-对偶关系。为了避免星系团与Ia型超新星(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Ia型超新星点与相应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的观测数据对,在相同的角直径距离红移下,利用Union 2集内插的相应光度距离,我们发现eta(z)的参数化在2 Sigma置信水平内满足等价于D-L(1 + z)(-2)/D-A = 1,这是更严格的比以前的结果没有考虑红移的偏见。
We propose a new consistent method to test the distance-duality relation which related the angular diameter distances (D-A) to the luminosity distances (D-L) in a cosmology-independent way. In order to avoid any bias brought by redshift incoincidence between galaxy clusters and Type Ia Supernovae (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 pairs at the same redshifts of the angular diameter distances from the complete 38 galaxy clusters for the spherical model and the corresponding luminosity distances interpolated from the Union 2 set, we find that eta equivalent to D-L(1 + z)(-2)/D-A = 1 is satisfied within 2 Sigma confidence level for parametrizations of eta(z), which are more stringent than previous results without considering redshift bias.
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