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The X-COP project: Galaxy cluster reconstruction with joint X-ray and SZ data


  • Dr. Dominique ECKERT

Auteurs principaux


X-ray and Sunyaev-Zeldovich observations provide independent and complementary ways of determining the properties of the intracluster medium (ICM). Joint reconstructions of galaxy cluster properties combining X-ray and SZ data are clearly superior to similar analyzes based on one observable only, since the two methods have a different radial dependency and probe different thermodynamic quantities. The XMM Cluster Outskirts Project (X-COP) is a very large programme on XMM-Newton which follows up the strongest SZ detections in the Planck survey. The primary goal of the project is to perform a joint X-ray/SZ reconstruction of cluster properties in a SZ-selected sample of 12 nearby clusters. X-COP provides the most accurate view of thermodynamic properties, hydrostatic mass profiles and gas fraction ever reached. I will present the main results of the survey and the tools developed for joint X-ray/SZ cluster reconstruction. I will then emphasize how NIKA2 can be combined in a similar way with X-ray instruments (XMM, Chandra, eROSITA) to bring high-quality constraints on cluster properties at higher redshifts.