The evolution of high-density cores of the BOSS Great Wall superclusters (original) (raw)
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Supercluster A2142 and collapse in action: infalling and merging groups and galaxy transformations
Astronomy & Astrophysics, 2018
Context. Superclusters with collapsing cores represent dynamically evolving environments for galaxies, galaxy groups, and clusters.Aims. We study the dynamical state and properties of galaxies and groups in the supercluster SCl A2142 that has a collapsing core, to understand its possible formation and evolution.Methods. We find the substructure of galaxy groups using normal mixture modelling. We have used the projected phase space (PPS) diagram, spherical collapse model, clustercentric distances, and magnitude gap between the brightest galaxies in groups to study the dynamical state of groups and to analyse group and galaxy properties. We compared the alignments of groups and their brightest galaxies with the supercluster axis.Results. The supercluster core has a radius of about 8h−1Mpc and total massMtot≈ 2.3 × 1015h−1M⊙and is collapsing. Galaxies in groups on the supercluster axis have older stellar populations than off-axis groups, with median stellar ages 4 − 6 and < 4 Gyr, c...
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