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arXiv 1708.02590astro-ph.CO
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Planck ESZ团簇的X射线形貌分析

X-Ray morphological analysis of the Planck ESZ clusters

Lorenzo Lovisari, William R. Forman, Christine Jones, Stefano Ettori, Felipe Andrade-Santos, Monique Arnaud, Jessica Démoclès, Gabriel W. Pratt, Scott Randall, Ralph Kraft

摘要:

X射线观测表明,星系团具有非常广泛的形态。最受干扰的系统,这是很好的研究如何集群的形成和增长,并测试物理模型,可能会复杂的宇宙学研究,因为集群质量的确定变得更具挑战性。因此,我们需要了解样本的聚类属性,以减少可能的偏差。这是复杂的事实,不同的实验可能会检测到不同的集群人口。例如,已经发现SZ选择的集群样本比X射线选择的样本包括更大比例的扰动系统。在本文中,我们确定了8个形态参数的普朗克早期Sunyaev-Zeldovich(ESZ)对象所观察到的XMM-牛顿。我们发现,两个参数,浓度和质心位移,是最好的放松和扰动系统之间的区别。对于每个参数,我们提供的值允许人们从样本中选择最放松或最受干扰的对象。我们发现,有没有质量的集群动力学状态的依赖。通过将我们的结果与REXCESS集群所获得的结果进行比较,我们也证实了ESZ集群确实更容易受到干扰,正如以前的研究所发现的那样。

英文摘要:

X-ray observations show that galaxy clusters have a very large range of morphologies. The most disturbed systems which are good to study how clusters form and grow and to test physical models, may potentially complicate cosmological studies because the cluster mass determination becomes more challenging. Thus, we need to understand the cluster properties of our samples to reduce possible biases. This is complicated by the fact that different experiments may detect different cluster populations. For example, SZ selected cluster samples have been found to include a greater fraction of disturbed systems than X-ray selected samples. In this paper we determined eight morphological parameters for the Planck Early Sunyaev-Zeldovich (ESZ) objects observed with XMM-Newton. We found that two parameters, concentration and centroid-shift, are the best to distinguish between relaxed and disturbed systems. For each parameter we provide the values that allow one to select the most relaxed or most disturbed objects from a sample. We found that there is no mass dependence on the cluster dynamical state. By comparing our results with what was obtained with REXCESS clusters, we also confirm that indeed the ESZ clusters tend to be more disturbed, as found by previous studies.

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