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  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., et al. (2019). Spectral imaging of the thermal Sunyaev–Zel’dovich effect in X-COP galaxy clusters: method and validation. Astronomy and Astrophysics, 630: A121. doi:10.1051/0004-6361/201936165.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0005-DB12-0 Version Permalink: http://hdl.handle.net/21.11116/0000-0005-DB13-F
Genre: Journal Article

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Baldi, A. S., Author
Bourdin, H., Author
Mazzotta, P., Author
Eckert, D.1, Author              
Ettori, S., Author
Gaspari, M., Author
Roncarelli, M., Author
Affiliations:
1High Energy Astrophysics, MPI for Extraterrestrial Physics, Max Planck Society, ou_159890              

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 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.

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 Dates: 2019-10-03
 Publication Status: Published online
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 Identifiers: DOI: 10.1051/0004-6361/201936165
Other: LOCALID: 3213686
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Title: Astronomy and Astrophysics
  Other : Astron. Astrophys.
Source Genre: Journal
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Publ. Info: France : EDP Sciences S A
Pages: - Volume / Issue: 630 Sequence Number: A121 Start / End Page: - Identifier: ISSN: 1432-0746
CoNE: https://pure.mpg.de/cone/journals/resource/954922828219_1