期刊
ASTRONOMY & ASTROPHYSICS
卷 642, 期 -, 页码 -出版社
EDP SCIENCES S A
DOI: 10.1051/0004-6361/202038982
关键词
galaxies: clusters: general; galaxies: distances and redshifts; galaxies: evolution; galaxies: high-redshift; galaxies: photometry; X-rays: galaxies: clusters
资金
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- NSERC
- Programme National Cosmology et Galaxies (PNCG) of CNRS/INSU
- CEA
- CNES
- Science and Technology Facilities Council (STFC) [ST/R505006/1]
- Glasstone Foundation
- Oxford Hintze Centre for Astrophysical Surveys through Hintze Family Charitable Foundation
- STFC consolidated grant [ST/N000919/1]
- ESO Telescopes at the La Silla Paranal Observatory under ESO programme [179.A-2006]
- National Aeronautics and Space Administration
- INP
- IN2P3
- STFC [ST/N000919/1] Funding Source: UKRI
Context. Distant galaxy clusters provide an effective laboratory in which to study galaxy evolution in dense environments and at early cosmic times.Aims. We aim to identify distant galaxy clusters as extended X-ray sources that are coincident with overdensities of characteristically bright galaxies.Methods. We used optical and near-infrared data from the Hyper Suprime-Cam and VISTA Deep Extragalactic Observations (VIDEO) surveys to identify distant galaxy clusters as overdensities of bright, z(phot)>= 0.8 galaxies associated with extended X-ray sources detected in the ultimate XMM extragalactic survey (XXL).Results. We identify a sample of 35 candidate clusters at 0.80 <= z <= 1.93 from an approximately 4.5 deg(2) sky area. This sample includes 15 newly discovered candidate clusters, ten previously detected but unconfirmed clusters, and ten spectroscopically confirmed clusters. Although these clusters host galaxy populations that display a wide variety of quenching levels, they exhibit well-defined relations between quenching, cluster-centric distance, and galaxy luminosity. The brightest cluster galaxies (BCGs) within our sample display colours that are consistent with a bimodal population composed of an old and red sub-sample together with a bluer, more diverse sub-sample.Conclusions The relation between galaxy masses and quenching seem to already be in place at z similar to 1, although there is no significant variation in the quenching fraction with the cluster-centric radius. The BCG bimodality might be explained by the presence of a younger stellar component in some BCGs, but additional data are needed to confirm this scenario.
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