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Spectral imaging and pressure profiles of the X-COP galaxy clusters with the Sunyaev-Zel'dovich effect


  • Anna Silvia BALDI

Auteurs principaux



The imaging of galaxy clusters through the Sunyaev-Zel'dovich effect is a valuable tool to probe the thermal pressure of the intra-cluster gas especially in the outermost regions, where X-ray observations suffer from photon statistics. For the first time, we produce maps of the Comptonization parameter by applying a locally parametric algorithm for sparse component separation to the latest Planck data. Our sample consists of twelve low-redshift galaxy clusters detected by Planck with the highest signal-to-noise ratio, considered for the XMM-Cluster Oustkirts Project (X-COP). Our images of the thermal Sunyaev-Zel'dovich effect show the presence of anisotropic features, such as small-scale blobs and filamentary substructures, located in the outskirts of a number of objects in the sample. In particular, we present a qualitative comparison with X-ray data for two interesting systems, namely A2029 and RXC1825. We use our maps to isolate and mask significant signal features in the virial region, in order to get unbiased pressure profiles of the intra-cluster gas.