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Structure formation is still ongoing via merging and accretion of gas and galaxies onto massive clusters. These processes can be best observed in the cluster outskirts. More specifically comma filaments between clusters are a unique laboratory to study structure formation since they represent a transition zone between the virialized comma self-gravitating Intercluster medium comma and the cooler comma less dense warm-hot intergalactic medium filling the cosmic web. Focusing on the ideal-configuration of an SZ-selected cluster pair comma the present proposal aims at performing an unprecedented joint X-ray-tSZ analysis of the transition from filaments to clusters. With this comma we will address key questions such asdoublePoint what is the physical state of the hot gas in filaments and how did it accret and heat to form the ICM.

宇宙结构形成过程仍在持续，其通过并合与吸积气体及星系至大质量星系团的方式实现。这类过程在星系团外围区域最易于被观测。更具体地说，星系团间的纤维结构是研究宇宙结构形成的独特研究实验室，因为它们代表了位力化自引力星系团间介质与填充宇宙网的低温、低密度温热星系际介质之间的过渡区域。本提案聚焦于苏尼亚耶夫-泽尔多维奇（Sunyaev-Zel'dovich, SZ）选择的理想构型星系团对，旨在开展针对纤维结构向星系团过渡过程的前所未有的X射线-热SZ效应联合分析。借此，我们将解决若干关键科学问题，例如：纤维结构内热气体的物理状态如何，以及这些气体如何通过吸积与加热过程形成星系团内介质（Intracluster Medium, ICM）。