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http://hdl.handle.net/20.500.12386/28886
Titolo: | Spectral imaging of the thermal Sunyaev-Zel'dovich effect in X-COP galaxy clusters: method and validation | Autori: | Baldi, A. S. Bourdin, H. Mazzotta, P. Eckert, D. ETTORI, STEFANO GASPARI, MASSIMO Roncarelli, M. |
Data pubblicazione: | 2019 | Rivista: | ASTRONOMY & ASTROPHYSICS | Numero: | 630 | Da pagina:: | A121 | Abstract: | 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. | URI: | http://hdl.handle.net/20.500.12386/28886 | URL: | https://www.aanda.org/articles/aa/abs/2019/10/aa36165-19/aa36165-19.html | ISSN: | 0004-6361 | DOI: | 10.1051/0004-6361/201936165 | Bibcode ADS: | 2019A&A...630A.121B | Fulltext: | open |
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