arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1601.00409astro-ph.CO
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用距离对偶关系检验星系团的气体质量密度分布

Testing the gas mass density profile of galaxy clusters with distance duality relation

Shuo Cao, Marek Biesiada, Xiaogang Zheng, Zong-Hong Zhu

摘要:

本文在距离对偶关系$η=D_L(z)(1+z)^{-2}/D_A(z)=1$成立的前提下,研究了两种团簇气体质量密度分布:等温$β$模型和非等温双$β$模型,其中$D_A(z)$和$D_L(z)$分别为角距离和光度距离.在我们的分析中,对38个大质量星系团观测的\textit{Chandra}(在红移范围内的$0.14<z<0.89$),我们使用两种类型的集群气体质量分数数据对应于不同的质量密度分布拟合的X射线数据。使用两个一般参数化的$η(z)$(唯象地允许距离对偶违反),我们发现,非等温双$β$模型符合更好的距离对偶关系,而等温$β$模型往往是轻微不兼容的Etherington定理在68.3% CL。然而,目前的数据精度不允许区分两种模型的气体密度分布在一个显着的水平。

英文摘要:

In this paper, assuming the validity of distance duality relation, $η=D_L(z)(1+z)^{-2}/D_A(z)=1$, where $D_A(z)$ and $D_L(z)$ are the angular and the luminosity distance respectively, we explore two kinds of gas mass density profiles of clusters: the isothermal $β$ model and the non-isothermal double-$β$ model. In our analysis, performed on 38 massive galaxy clusters observed by \textit{Chandra} (within the redshift range of $0.14<z<0.89$), we use two types of cluster gas mass fraction data corresponding to different mass density profiles fitted to the X-ray data. Using two general parameterizations of $η(z)$ (phenomenologically allowing for distance duality violation), we find that the non-isothermal double-$β$ model agrees better with the distance duality relation, while the isothermal $β$ model tends to be marginally incompatible with the Etherington theorem at 68.3% CL. However, current accuracy of the data does not allow to distinguish between the two models for the gas-density distribution at a significant level.

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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