2019A&A...630A.121B


Query : 2019A&A...630A.121B

2019A&A...630A.121B - Astronomy and Astrophysics, volume 630A, 121-121 (2019/10-1)

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. and RONCARELLI M.

Abstract (from CDS):

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.

Abstract Copyright: © ESO 2019

Journal keyword(s): techniques: image processing - galaxies: clusters: general - galaxies: clusters: intracluster medium

Simbad objects: 14

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Number of rows : 14
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 ACO 85 ClG 00 41 37.8 -09 20 33           ~ 871 0
2 ACO 3158 ClG 03 42 39.6 -53 37 50           ~ 292 0
3 ACO 3266 ClG 04 31 11.9 -61 24 23           ~ 402 0
4 ACO 644 ClG 08 17 24.5 -07 30 46           ~ 217 0
5 ZwCl 1215+0400 ClG 12 17 40.6 +03 39 45           ~ 119 0
6 ACO 1644 ClG 12 57 11.6 -17 24 34           ~ 357 1
7 ACO 1795 ClG 13 49 00.5 +26 35 07           ~ 1228 0
8 ACO 2029 ClG 15 10 58.7 +05 45 42           ~ 919 0
9 ACO 2033 ClG 15 11 23.50 +06 19 08.4           ~ 92 0
10 ACO 2142 ClG 15 58 20.00 +27 14 00.3           ~ 740 0
11 ACO 2255 ClG 17 12 50.04 +64 03 10.6           ~ 550 0
12 NPM1G +30.0453 ClG 18 24 09.6 +30 29 31           ~ 14 0
13 CIZA J1825.3+3026 ClG 18 25 22.8 +30 26 32           ~ 44 0
14 ACO 2319 ClG 19 20 45.3 +43 57 43           ~ 446 1

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2023.06.06-12:39:24

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