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Collapse, Connectivity, and Galaxy Populations in Supercluster Cocoons: the Case of A2142

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Abstract

The largest galaxy systems in the cosmic web are superclusters, overdensity regions of galaxies, groups, clusters, and filaments. Low-density regions around superclusters are called basins of attraction or cocoons. In my talk I discuss the properties of galaxies, groups, and filaments in the A2142 supercluster and its cocoon at redshift \(z \approx 0.09\). Cocoon boundaries are determined by the lowest density regions around the supercluster. We analyse the structure, dynamical state, connectivity, and galaxy content of the supercluster, and its high density core with the cluster A2142. We show that the main body of the supercluster is collapsing, and long filaments which surround the supercluster are detached from it. Galaxies with very old stellar populations lie not only in the central parts of clusters and groups in the supercluster, but also in the poorest groups in the cocoon.

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  1. http://skyserver.sdss3.org/dr10/en/help/browser/browser.aspx

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ACKNOWLEDGMENTS

I thank my co-authors Boris Deshev, Peeter Tenjes, Pekka Heinämäki, Elmo Tempel, Lauri Juhan Liivamägi, Jaan Einasto, Heidi Lietzen, Taavi Tuvikene, and Gayoung Chon for fruitful and enjoyable collaboration. We are pleased to thank the SDSS Team for the publicly available data releases. The SDSS website is http://www.sdss.org/. We applied in this study R statistical environment.

Funding

The present study was supported by the ETAG projects IUT26-2, IUT40-2, PUT1627, by the European Structural Funds grant for the Centre of Excellence “Dark Matter in (Astro)particle Physics and Cosmology” (TK133), and by MOBTP86.

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  1. Tartu Observatory, Tartu University, Tõravere, Tartumaa, Estonia

    M. Einasto

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Correspondence to M. Einasto.

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Paper presented at the Fourth Zeldovich meeting, an international conference in honor of Ya.B. Zeldovich held in Minsk, Belarus, on September 7–11, 2020. Published by the recommendation of the special editors: S.Ya. Kilin, R. Ruffini, and G.V. Vereshchagin.

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Einasto, M. Collapse, Connectivity, and Galaxy Populations in Supercluster Cocoons: the Case of A2142. Astron. Rep. 65, 932–936 (2021). https://doi.org/10.1134/S1063772921100085

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