Exploiting NIKA2/XMM-Newton imaging synergy for intermediate mass, high-$z$ galaxy clusters within the NIKA2 SZ Large Program

Abstract

High-resolution mapping of the intra-cluster medium (ICM) up to high redshift and down to low masses is crucial to derive accurate mass estimates of the galaxy cluster and to understand the systematic effects affecting cosmological studies based on galaxy clusters. We present a spatially-resolved Sunyaev-Zel'dovich (SZ)/X-ray analysis of ACT-CL J0215.4+0030, a high redshift ($z=0.865$) galaxy cluster of intermediate mass ($M_{500}\simeq 3.5\times 10^{14}{\mathrm{M}}_{\odot }$) observed as part of the ongoing NIKA2 SZ Large Program, a follow up of a representative sample of objects at $0.5⩽z⩽0.9$. In addition to the faintness and small angular size induced by its mass and redshift, the cluster is contaminated by point sources that significantly affect the SZ signal. Therefore, this is an interesting case study for the most challenging sources of the NIKA2 cluster sample. We present the NIKA2 observations of this cluster and the resulting data. We reconstruct the ICM pressure profile by performing a joint analysis of the SZ signal and of the point sources in the NIKA2 150 GHz map. We obtain high-quality estimates of the ICM thermodynamical properties with NIKA2. We compare the pressure profile extracted from the NIKA2 map to the pressure profile obtained from X-ray data only by deprojecting XMM-Newton observations of the cluster. We combine the NIKA2 pressure profile with the X-ray deprojected density to extract detailed information on the ICM. The radial distribution of its thermodynamic properties indicate that the cluster has a disturbed core. The hydrostatic mass of the cluster is to be compatible with estimations from SZ and X-rays scaling relations. We conclude that the NIKA2 SZ large program can deliver quality information on the thermodynamics of the ICM even for one of its faintest clusters, after a careful treatment of the contamination by point sources.

arXiv comment14 pages, 10 figures, Accepted for publication in Astronomy and Astrophysics

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