Clusters of galaxies up to z = 1.5 identified from photometric data of the Dark Energy Survey and unWISE

• Published in: Monthly Notices of the Royal Astronomical Society
• Main Authors: Wen, Z L, Han, J L
• Other Authors: National Natural Science Foundation of China, Chinese Academy of Sciences, China Manned Space, U.S. Department of Energy, National Science Foundation, Science and Technology Facilities Council, Higher Education Funding Council for England, National Center for Supercomputing Applications, University of Illinois at Urbana-Champaign, University of Chicago, Center for Cosmology and AstroParticle Physics, Ohio State University, Financiadora de Estudos e Projetos, Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro, Conselho Nacional de Desenvolvimento Científico e Tecnológico, Ministério da Ciência, Tecnologia e Inovação, Deutsche Forschungsgemeinschaft, Argonne National Laboratory, University of California, Santa Cruz, University of Cambridge, Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, University College London, University of Edinburgh, Eidgenössische Technische Hochschule Zürich, CSIC, Lawrence Berkeley National Laboratory, University of Michigan, University of Nottingham, University of Pennsylvania, University of Portsmouth, SLAC National Accelerator Laboratory, Stanford University, University of Sussex, Texas A&M University, University of California, Los Angeles, Jet Propulsion Laboratory, California Institute of Technology, National Aeronautics and Space Administration, ESO
• Format: Article in Journal/Newspaper
• Language: English
• Published: Oxford University Press (OUP) 2022
• Subjects: South pole
• Online Access: http://dx.doi.org/10.1093/mnras/stac1149; https://academic.oup.com/mnras/advance-article-pdf/doi/10.1093/mnras/stac1149/43499427/stac1149.pdf; https://academic.oup.com/mnras/article-pdf/513/3/3946/43707373/stac1149.pdf

ABSTRACT Using photometric data from the Dark Energy Survey and the Wide-field Infrared Survey Explorer, we estimate photometric redshifts for 105 million galaxies using the nearest-neighbour algorithm. From such a large data base, 151 244 clusters of galaxies are identified in the redshift range of 0.1 < z ≲ 1.5 based on the overdensity of the total stellar mass of galaxies within a given photometric redshift slice, among which 76 826 clusters are newly identified and 30 477 clusters have a redshift z > 1. We cross-match these clusters with those in the catalogues identified from the X-ray surveys and the Sunyaev–Zel’dovich (SZ) effect by the Planck, South Pole Telescope and Atacama Cosmology Telescope surveys, and get the redshifts for 45 X-ray clusters and 56 SZ clusters. More than 95 per cent SZ clusters in the sky region have counterparts in our catalogue. We find multiple optical clusters in the line of sight towards about 15 per cent of SZ clusters.