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Suzaku observations of low surface brightness cluster Abell 1631

机译：朱雀观测到的低表面亮度簇Abell 1631

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We present analysis results for a nearby galaxy cluster Abell 1631 at z?=?0.046 using the X-ray observatory Suzaku. This cluster is categorized as a low X-ray surface brightness cluster. To study the dynamical state of the cluster, we conduct four-pointed Suzaku observations and investigate physical properties of the Mpc-scale hot gas associated with the A?1631 cluster for the first time. Unlike relaxed clusters, the X-ray image shows no strong peak at the center and an irregular morphology. We perform spectral analysis and investigate the radial profiles of the gas temperature, density, and entropy out to approximately 1.5?Mpc in the east, north, west, and south directions by combining with the XMM-Newton data archive. The measured gas density in the central region is relatively low (a few?×10?4?cm?3) at the given temperature (～2.9?keV) compared with X-ray-selected clusters. The entropy profile and value within the central region (r??0.1?r200) are found to be flatter and higher (?400?keV?cm2). The observed bolometric luminosity is approximately three times lower than that expected from the luminosity–temperature relation in previous studies of relaxed clusters. These features are also observed in another low surface brightness cluster, Abell 76. The spatial distributions of galaxies and the hot gas appear to be different. The X-ray luminosity is relatively lower than that expected from the velocity dispersion. A post-merger scenario may explain the observed results.
机译：我们使用X射线天文台朱雀提出了附近z == 0.046的星系团Abell 1631的分析结果。该聚类被分类为低X射线表面亮度聚类。为了研究团簇的动力学状态，我们进行了四点朱雀观测，并首次研究了与A？1631团簇相关的Mpc级热气的物理性质。与松弛星团不同，X射线图像在中心没有显示出强烈的峰，并且形态不规则。我们进行光谱分析，并结合XMM-Newton数据档案，研究了东，北，西和南方向上气体温度，密度和熵的径向分布，约为1.5？Mpc。与X射线选择的星团相比，在给定温度（〜2.9？keV）下，中心区域测得的气体密度相对较低（几？×10？4？cm？3）。发现中心区域内的熵分布和值（r≤＜0.1≤r200）更平坦并且更高（≤400≤keV≤cm2）。观测到的辐射热亮度比先前对松弛星团的研究的发光度与温度关系的预期值低大约三倍。在另一个低表面亮度的星团Abell 76中也观察到了这些特征。星系和热气体的空间分布似乎有所不同。 X射线的光度相对低于速度分散所预期的光度。合并后的场景可能会解释观察到的结果。

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