Measurement of the splashback feature around SZ-selected Galaxy clusters with DES, SPT, and ACT

• Published in: Monthly Notices of the Royal Astronomical Society
• Main Authors: Rozo, E, Gralla, M
• Other Authors: Univ Arizona, Dept Phys, Univ Arizona, Dept Astron, Univ Arizona, Steward Observ
• Format: Article in Journal/Newspaper
• Language: English
• Published: OXFORD UNIV PRESS 2019
• Subjects: galaxies: clusters: general; galaxies: evolution; cosmology: observations; Canada; South Pole; Kavli; South pole
• Online Access: http://hdl.handle.net/10150/633957; https://doi.org/10.1093/mnras/stz1434

We present a detection of the splashback feature around galaxy clusters selected using the Sunyaev-Zel'dovich (SZ) signal. Recent measurements of the splashback feature around optically selected galaxy clusters have found that the splashback radius, rsp, is smaller than predicted by N-body simulations. Apossible explanation for this discrepancy is that rsp inferred from the observed radial distribution of galaxies is affected by selection effects related to the optical cluster-finding algorithms. We test this possibility by measuring the splashback feature in clusters selected via the SZ effect in data from the South Pole Telescope SZ survey and the Atacama Cosmology Telescope Polarimeter survey. The measurement is accomplished by correlating these cluster samples with galaxies detected in the Dark Energy Survey Year 3 data. The SZ observable used to select clusters in this analysis is expected to have a tighter correlation with halo mass and to be more immune to projection effects and aperture-induced biases, potentially ameliorating causes of systematic error for optically selected clusters. We find that the measured r(sp) for SZ-selected clusters is consistent with the expectations from simulations, although the small number of SZ-selected clusters makes a precise comparison difficult. In agreement with previous work, when using optically selected redMaPPer clusters with similar mass and redshift distributions, r(sp) is similar to 2 sigma smaller than in the simulations. These results motivate detailed investigations of selection biases in optically selected cluster catalogues and exploration of the splashback feature around larger samples of SZ-selected clusters. Additionally, we investigate trends in the galaxy profile and splashback feature as a function of galaxy colour, finding that blue galaxies have profiles close to a power law with no discernible splashback feature, which is consistent with them being on their first infall into the cluster. Leibniz-Institute for Astrophysics Potsdam (AIP); Spanish MultiDark Consolider Project [CSD2009-00064]; Gauss Centre for Supercomputing e.V.; U.S. Department of Energy [DEAC02-06CH11357]; U.S. National Science Foundation [AST-1440226, AST-0965625, AST-0408698, PHY-1214379, PHY-0855887]; Ministry of Science and Education of Spain; Science and Technology Facilities Council of the United Kingdom; Higher Education Funding Council for England; National Center for Supercomputing Applications at the University of Illinois at Urbana-Champaign; Center for Cosmology and Astro-Particle Physics at the Ohio State University; Mitchell Institute for Fundamental Physics and Astronomy at Texas AM University; Financiadora de Estudos e Projetos; Fundacao Carlos Chagas Filho de Amparo a Pesquisa do Estado do Rio de Janeiro; Conselho Nacional de Desenvolvimento Cientifico e Tecnologico; Deutsche Forschungsgemeinschaft; University of California at Santa Cruz; University of Cambridge, Centro de Investigaciones Energeticas, Medioambientales y Tecnologicas-Madrid; DES-Brazil Consortium; University of Edinburgh; Eidgenossische Technische Hochschule (ETH) Zurich; Ludwig-Maximilians Universitat Munchen; University of Portsmouth; OzDES Membership Consortium; National Science Foundation [AST-1138766, AST-1536171]; Ministry of Ecomony and Competitiveness [AYA2015-71825, ESP2015-66861, FPA2015-68048, SEV-2016-0588, SEV-2016-0597, MDM-2015-0509]; ERDF; European Union - CERCA program of the Generalitat de Catalunya; European Research Council under the European Union; ERC [240672, 291329, 306478]; Australian Research Council Centre of Excellence for All-sky Astrophysics (CAASTRO) [CE110001020]; Brazilian Instituto Nacional de Ciencia e Tecnologia (INCT) e-Universe (CNPq) [465376/2014-2, DE-AC02-07CH11359]; U.S. Department of Energy, Office of Science, Office of High Energy Physics; National Science Foundation (NSF) [PLR-1248097]; NSF Physics Frontier Center [PHY-0114422]; Kavli Institute of Cosmological Physics at the University of Chicago; Kavli Foundation; Gordon and Betty Moore Foundation [947]; Natural Sciences and Engineering Research Council of Canada; Canadian Institute for Advanced Research; Canada Research Chairs program; Princeton University; Canada Foundation for Innovation (CFI) award; Comision Nacional de Investigacion Cientifica y Tecnologica de Chile (CONICYT) - CFI under the auspices of Compute Canada; Government of Ontario; Ontario Research Fund -Research Excellence; University of Toronto; National Aeronautics and Space Administration [NNX13AE56G, NNX14AB58G] This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at [e-mail].