The XXL Survey LI. Pressure profile and $Y_{\mathrm{SZ}}$-$M$ scaling relation in three low-mass galaxy clusters at $z\sim 1$ observed with NIKA2

Abstract

The thermodynamical properties of the intracluster medium (ICM) are driven by scale-free gravitational collapse, but they also reflect the rich astrophysical processes at play in galaxy clusters. At low masses ($\sim 10^{14}$ M${}_{\odot }$) and high redshift ($z\gtrsim 1$), these properties remain poorly constrained observationally, due to the difficulty in obtaining resolved and sensitive data. This paper aims at investigating the inner structure of the ICM as seen through the Sunyaev-Zel'dovich (SZ) effect in this regime of mass and redshift. Focus is set on the thermal pressure profile and the scaling relation between SZ flux and mass, namely the $Y_{\mathrm{SZ}}-M$ scaling relation. The three galaxy clusters XLSSC~072 ($z=1.002$), XLSSC~100 ($z=0.915$), and XLSSC~102 ($z=0.969$), with $M_{500}\sim 2\times 10^{14}$ M${}_{\odot }$, were selected from the XXL X-ray survey and observed with the NIKA2 millimeter camera to image their SZ signal. XMM-Newton X-ray data were used in complement to the NIKA2 data to derive masses based on the $Y_X-M$ relation and the hydrostatic equilibrium. The SZ images of the three clusters, along with the X-ray and optical data, indicate dynamical activity related to merging events. The pressure profile is consistent with that expected for morphologically disturbed systems, with a relatively flat core and a shallow outer slope. Despite significant disturbances in the ICM, the three high-redshift low-mass clusters follow remarkably well the $Y_{\mathrm{SZ}}-M$ relation expected from standard evolution. These results indicate that the dominant physics that drives cluster evolution is already in place by $z\sim 1$, at least for systems with masses above $M_{500}\sim 10^{14}$ M${}_{\odot }$.

arXiv comment24 pages, published in A&A. Note that the title number had to be changed. This version matches the one from A&A

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