Witnessing the intracluster medium assembly at the cosmic noon in JKCS041
Date Issued
2023
Author(s)
•
Romero, C.
•
Aussel, H.
•
Bhandarkar, T.
•
Devlin, M.
•
Dicker, S.
•
Ladjelate, B.
•
Lowe, I.
•
Mason, B.
•
Mroczkowski, T.
•
Raichoor, A.
•
Sarazin, C.
•
Abstract
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.
Volume
522
Issue
3
Start page
4301
Issn Identifier
0035-8711
Rights
open.access
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