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Article Dans Une Revue Monthly Notices of the Royal Astronomical Society Année : 2023

Witnessing the intracluster medium assembly at the cosmic noon in JKCS041

S Andreon
  • Fonction : Auteur
C Romero
  • Fonction : Auteur
T Bhandarkar
  • Fonction : Auteur
M Devlin
  • Fonction : Auteur
S Dicker
  • Fonction : Auteur
I Lowe
  • Fonction : Auteur
B Mason
  • Fonction : Auteur
T Mroczkowski
  • Fonction : Auteur
A Raichoor
  • Fonction : Auteur
C Sarazin
  • Fonction : Auteur
G Trinchieri
  • Fonction : Auteur

Résumé

In this work we study the intracluster medium of a galaxy cluster at the cosmic noon: JKCS041 at z=1.803. A 28h long Sunyaev-Zel'dovich (SZ) observation using MUSTANG-2 allows us to detect JKCS041, even if intrinsically extremely faint compared to other SZ-detected clusters. We found that the SZ peak is offset from the X-ray center by about 220 kpc in the direction of the brightest cluster galaxy, which we interpret as due to the cluster being observed just after first passage of a major merger. JKCS041 has a low central pressure and a low Compton Y compared to local clusters selected by their intracluster medium (ICM), likely because the cluster is still in the process of assembly but also in part because of a hard-to-quantify bias in current local ICM-selected samples. JKCS041 has a 0.5 dex fainter Y signal than another less massive z~1.8 cluster, exemplifying how much different weak-lensing mass and SZ mass can be at high redshift. The observations we present provide us with the measurement of the most distant resolved pressure profile of a galaxy cluster. Comparison with a library of plausibly descendants shows that JKCS041 pressure profile will likely increase by about 0.7 dex in the next 10 Gyr at all radii.
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Dates et versions

hal-04110499 , version 1 (23-04-2024)

Identifiants

Citer

S Andreon, C Romero, H Aussel, T Bhandarkar, M Devlin, et al.. Witnessing the intracluster medium assembly at the cosmic noon in JKCS041. Monthly Notices of the Royal Astronomical Society, 2023, 522 (3), pp.4301-4309. ⟨10.1093/mnras/stad1270⟩. ⟨hal-04110499⟩
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