Joint X-Ray and Optical Measurements of the Mass Distribution of the Distant Galaxy Cluster Cl J0152.7−1357
Joint X-Ray and Optical Measurements of the Mass Distribution of the Distant Galaxy Cluster Cl J0152.7−1357
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遥远星系团 Cl J0152.7−1357 质量分布的联合 X 射线和光学测量
DOI：
10.1086/381949
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发表时间：
2003
期刊：
影响因子：
--
通讯作者：
P. Rosati
中科院分区：
文献类型：
--
作者：
Z. Huo;S. Xue;Haiguang Xu;G. Squires;P. Rosati
本文利用钱德拉x射线天文台和凯克望远镜对高红移（z≃0.83）透镜团Cl J0152.7-1357进行了x射线和光学联合观测。我们证实了在x射线和光学波长下存在两个不同团块形式的重要亚结构，其温度分别为6.6和5.7 keV。两个团块的x射线表面亮度曲线可以用单个β模型或nfw型曲线拟合，后者更适合中心区域。我们发现该星团的x射线衍生质量与独立透镜测量结果很好地吻合。虽然其外观表明该星团尚未达到动态平衡状态，但其x射线光度LX、温度T和动态质量M与低红移星系团明确定义的LX-T和M-T关系一致，这表明该星系团的动力学性质自z≈0.8以来几乎没有变化。
We present joint X-ray and optical observations of the high-redshift (z ≃ 0.83) lensing cluster Cl J0152.7-1357 made with the Chandra X-Ray Observatory and the Keck telescope. We confirm the existence of significant substructure at both X-ray and optical wavelengths in the form of two distinct clumps, whose temperatures are 6.6 and 5.7 keV, respectively. The X-ray surface brightness profiles of the two clumps can be fitted by either a single β-model or an NFW-like profile, the latter giving better fits to the central regions. We find that the X-ray–derived mass of this cluster is in good agreement with independent lensing measurements. While its appearance indicates that the cluster has not reached a dynamical equilibrium state, its X-ray luminosity LX, temperature T, and dynamical mass M are consistent with the well-defined LX-T and M-T relations for low-redshift galaxy clusters, which suggests that the dynamical properties of the clusters have remained almost unchanged since z ≈ 0.8.