%0 Journal Article
%T An extreme case of galaxy and cluster co-evolution at z = 0.7
%+ Centre de Recherche Astrophysique de Lyon (CRAL)
%A Ebeling, H.
%A Richard, J.
%A Smail, I.
%A Edge, A. C.
%A Koekemoer, A. M.
%A Zalesky, L.
%< avec comité de lecture
%@ 0035-8711
%J Monthly Notices of the Royal Astronomical Society
%I Oxford University Press (OUP): Policy P - Oxford Open Option A
%V 508
%P 3663-3671
%8 2021
%D 2021
%Z 2109.08798
%Z 2021MNRAS.508.3663E
%R 10.1093/mnras/stab2725
%K gravitational lensing: strong
%K galaxies: clusters: general
%K galaxies: clusters: intracluster medium
%K galaxies: elliptical and lenticular
%K cD
%K galaxies: evolution
%K galaxies: kinematics and dynamics
%K Astrophysics - Astrophysics of Galaxies
%Z Sciences of the Universe [physics]Journal articles
%X We report the discovery of eMACS J0252.4-2100 (eMACS J0252), a massive and highly evolved galaxy cluster at z = 0.703. Our analysis of Hubble Space Telescope imaging and VLT/MUSE and Keck/DEIMOS spectroscopy of the system finds a high-velocity dispersion of 1020$^{+180}_{-190}$ km s-1 and a high (if tentative) X-ray luminosity of (1.2 ± 0.4) × 1045 erg s-1 (0.1-2.4 keV). As extreme is the system's brightest cluster galaxy, a giant cD galaxy that forms stars at a rate of between 85 and 300 M⊙ yr-1 and features an extended halo of diffuse [O II] emission, as well as evidence of dust. Its most remarkable properties, however, are an exceptionally high ellipticity and a radially symmetric flow of gas in the surrounding intracluster medium, potential direct kinematic evidence of a cooling flow. A strong-lensing analysis, anchored by two multiple-image systems with spectroscopic redshifts, finds the best lens model to consist of a single cluster-scale halo with a total mass of (1.9 ± 0.1) × 1014 M⊙ within 250 kpc of the cluster core and, again, an extraordinarily high ellipticity of e = 0.8. Although further, in-depth studies across the electromagnetic spectrum (especially in the X-ray regime) are needed to conclusively determine the dynamical state of the system, the properties established so far suggest that eMACS J0252 must have already been highly evolved well before z ~ 1, making it a prime target to constrain the physical mechanisms and history of the co-evolution or dark-matter haloes and baryons in the era of cluster formation.
%G English
%2 https://insu.hal.science/insu-03711483/document
%2 https://insu.hal.science/insu-03711483/file/stab2725.pdf
%L insu-03711483
%U https://insu.hal.science/insu-03711483
%~ ENS-LYON
%~ INSU
%~ CNRS
%~ UNIV-LYON1
%~ CRAL
%~ UDL
%~ UNIV-LYON