Witnessing the intracluster medium assembly at the cosmic noon in JKCS 041

被引:8
作者
Andreon, S. [1 ]
Romero, C. [2 ,3 ,4 ]
Aussel, H. [5 ]
Bhandarkar, T. [4 ]
Devlin, M. [4 ]
Dicker, S. [4 ]
Ladjelate, B. [6 ]
Lowe, I [4 ,7 ]
Mason, B. [8 ]
Mroczkowski, T. [9 ,10 ]
Raichoor, A.
Sarazin, C. [11 ]
Trinchieri, G. [1 ]
机构
[1] INAF Osservatorio Astron Brera, via Brera 28, I-20121 Milan, Italy
[2] Harvard & Smithsonian, Ctr Astrophys, 60 Garden St, Cambridge, MA 02138 USA
[3] Green Bank Observ, 155 Observ Rd, Green Bank, WV 24944 USA
[4] Univ Penn, Dept Phys & Astron, 209 South 33rd St, Philadelphia, PA 19104 USA
[5] Univ Paris Diderot, Sorbonne Paris Cite, Univ Paris Saclay, AIM,CEA,CNRS, F-91191 Gif Sur Yvette, France
[6] Inst Radioastron Milimetr IRAM, Granada 18012, Spain
[7] Univ Arizona, Dept Astron, Tucson, AZ 85721 USA
[8] Natl Radio Astron Observ, 520 Edgemont Rd, Charlottesville, VA 22903 USA
[9] European Southern Observ, Karl Schwarzshild Str 2, D-85748 Munich, Germany
[10] Lawrence Berkeley Natl Lab, 1 Cyclotron Rd, Berkeley, CA 94720 USA
[11] Univ Virginia, Dept Astron, PO Box 400325, Charlottesville, VA 22904 USA
关键词
galaxies: clusters: general; Galaxies: clusters: individual: JKCS041; Galaxies: clusters: intracluster medium; X-rays: galaxies: clusters; ATACAMA COSMOLOGY TELESCOPE; GALAXY CLUSTER; PRESSURE PROFILE; X-RAY; SPECTROSCOPIC CONFIRMATION; IDCS J1426.5+3508; STAR-FORMATION; TO; MASS; REDSHIFT;
D O I
10.1093/mnras/stad1270
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
In this work, we study the intracluster medium (ICM) of a galaxy cluster at the cosmic noon: JKCS 041 at z = 1.803. A 28 h long Sunyaev-Zel'dovich (SZ) observation using MUSTANG-2 allows us to detect JKCS 041, even if intrinsically extremely faint compared to other SZ-detected clusters. We found that the SZ peak is offset from the X-ray centre by about 220 kpc in the direction of the brightest cluster galaxy, which we interpret as due to the cluster being observed just after the first passage of a major merger. JKCS 041 has a low central pressure and a low Compton Y compared to local clusters selected by their 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. JKCS 041 has a 0.5 dex fainter Y signal than another less massive z similar to 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 JKCS 041 pressure profile will likely increase by about 0.7 dex in the next 10 Gyr at all radii.
引用
收藏
页码:4301 / 4309
页数:9
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