Spectral imaging of the thermal Sunyaev–Zel’dovich effect in X-COP galaxy 
clusters: method and validation

Baldi, A. S.; Bourdin, H.; Mazzotta, P.; Eckert, D.; Ettori, S.; Gaspari, M.; Roncarelli, M.

doi:10.1051/0004-6361/201936165

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Spectral imaging of the thermal Sunyaev–Zel’dovich effect in X-COP galaxy clusters: method and validation

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Eckert, D.
High Energy Astrophysics, MPI for Extraterrestrial Physics, Max Planck Society;

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引用

Baldi, A. S., Bourdin, H., Mazzotta, P., Eckert, D., Ettori, S., Gaspari, M., & Roncarelli, M. (2019). Spectral imaging of the thermal Sunyaev–Zel’dovich effect in X-COP galaxy clusters: method and validation. Astronomy and Astrophysics, 630:. doi:10.1051/0004-6361/201936165.

引用: https://hdl.handle.net/21.11116/0000-0005-DB12-0

要旨

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 frequency maps released by Planck. The algorithm takes into account properties of real cluster data through the two-component modelling of the spectral energy density of thermal dust, and the masking of bright point sources. Its robustness has been improved in the low signal-to-noise regime, thanks to the implementation of a deconvolution of Planck beams in the chi-square minimisation of each wavelet coefficient. We applied this procedure to twelve low-redshift galaxy clusters detected by Planck with the highest signal-to-noise ratio, considered in the XMM Cluster Oustkirts Project (X-COP). Our images show the presence of anisotropic features, such as small-scale blobs and filamentary substructures that are located in the outskirts of a number of clusters in the sample. The significance of their detection is established via a bootstrap-based procedure we propose here for the first time. In particular, we present a qualitative comparison with X-ray data for two interesting systems, namely A2029 and RXCJ1825. Our results are in agreement with the features detected in the outskirts of the clusters in the two bands.