2020/08/01 by Tapish Narwal, Tomotsugu Goto, Tetsuya Hashimoto +3
Physics and Astronomy · #Astronomy and Astrophysical Research #Cluster (spacecraft) #Cosmology and Gravitation Theories #Dark energy #Galaxies: Formation, Evolution, Phenomena #Galaxy #Galaxy cluster #Redshift #Sky #Supercluster (genetic) #astro-ph.CO
paper · pdf · doi:10.3847/1538-4357/ab9c28
published in The Astrophysical Journal 898(2), 159 (IOP Publishing)
openalex publication_date 2020/08/01 · arxiv created 2020/08/10 · openalex created_date 2020/08/10 · arxiv updated 2020/08/11 · openalex updated_date 2026/08/06
Abstract We report a promising candidate for a distant supercluster at z ∼ 1.1 in the Dark Energy Survey Science Verification data. We examine smoothed semi-3D galaxy density maps in various photo-z slices. Among several overdense regions, in this work we report the most significant one as having a 3 σ overdensity at a redshift of ∼1.1, over a ∼160 Mpc scale, much larger than the regular cluster scale (several Mpc). The shape of the supercluster is not circular in the sky projection. Therefore, we regard the point of maximum overdensity as the center for quantitative measurements. Two different estimates suggest the mass of the supercluster to be <?CDATA 1.37-0.79+1.31× 1017 M\odot ?> , more than one order more massive than regular galaxy clusters. Except for protosuperclusters found with emission-line galaxies, this could be the most distant supercluster to date defined by regular galaxies. A spectroscopic confirmation would make this a very interesting object for cosmology. We discuss the possible implications of such a massive structure for ΛCDM cosmology.