维里区的X射线/SZ视图。I.热力学性质
The X-ray/SZ view of the virial region. I. Thermodynamic properties
摘要：
我们测量团簇外部区域的热力学性质，以提供对规则形成大尺度结构的过程的约束。结合Planck给出的SZ热压力和ROSAT给出的X射线气体密度，导出了团内气体的热力学性质（温度、熵）。这种方法使我们能够第一次在大样本的物体中重建温度和熵分布，直到维里半径和更远。与最近的几项朱雀研究不同，我们发现熵随着半径的增加而稳步上升，尽管速度比自相似期望预测的要低一些。我们注意到放松，冷核系统和非放松集群的外部区域之间的显着差异。放松系统似乎更密切地遵循自相似的期望比扰动对象。我们的研究结果表明，著名的熵过剩观察到的集群核心远远超出了中心区域。当对气体损耗进行校正时，观测到的熵分布与仅从引力坍缩得到的预测一致，特别是对于冷核星系团。
英文摘要：
We measure the thermodynamic properties of cluster outer regions to provide constraints on the processes that rule the formation of large scale structures. We derived the thermodynamic properties of the intracluster gas (temperature, entropy) by combining the SZ thermal pressure from Planck and the X-ray gas density from ROSAT. This method allowed us to reconstruct for the first time temperature and entropy profiles out to the virial radius and beyond in a large sample of objects. At variance with several recent Suzaku studies, we find that the entropy rises steadily with radius, albeit at at a somewhat lower rate than predicted by self-similar expectations. We note significant differences between relaxed, cool-core systems and unrelaxed clusters in the outer regions. Relaxed systems appear to follow the self-similar expectations more closely than perturbed objects. Our results indicate that the well-known entropy excess observed in cluster cores extends well beyond the central regions. When correcting for the gas depletion, the observed entropy profiles agree with the prediction from gravitational collapse only, especially for cool-core clusters.
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