Supercluster A2142 and collapse in action - infalling and merging groups and galaxy transformations
Maret Einasto, Mirt Gramann, Changbom Park, Juhan Kim, Boris Deshev,, Elmo Tempel, Pekka Hein\"am\"aki, Heidi Lietzen, Anne L\"ahteenm\"aki, Jaan, Einasto, and Enn Saar

TL;DR
This study investigates the dynamical state and galaxy properties in the supercluster SClA2142, revealing a collapsing core, group infall, and galaxy transformations that shed light on its formation and evolution.
Contribution
It provides a detailed analysis of the supercluster's collapsing core, galaxy group dynamics, and galaxy evolution, highlighting the supercluster's ongoing formation processes.
Findings
The supercluster core is collapsing with a radius of about 8 h^{-1} Mpc and mass ~2.3×10^{15} h^{-1} M_sun.
Galaxies in groups on the supercluster axis are older than those off-axis.
Groups are dynamically young, with magnitude gaps less than one magnitude.
Abstract
We study the dynamical state and properties of galaxies and groups in the supercluster SClA2142 that has a collapsing core, to understand its possible formation and evolution. 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. The supercluster core has a radius of about Mpc and total mass and is collapsing. Galaxies in groups on the supercluster axis have older stellar populations than off-axis groups, with median stellar ages and Gyr,…
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