Multiscale cosmic web detachments, connectivity, and preprocessing in the supercluster SClA2142 cocoon
Maret Einasto, Boris Deshev, Peeter Tenjes, Pekka Hein\"am\"aki, Elmo, Tempel, Lauri Juhan Liivam\"agi, Jaan Einasto, Heidi Lietzen, Taavi Tuvikene,, and Gayoung Chon

TL;DR
This study investigates the properties, connectivity, and galaxy content of the supercluster SClA2142 and its surrounding cocoon, revealing a 75 Mpc long straight filament, galaxy evolution patterns, and implications for cosmological models.
Contribution
It provides the first detailed analysis of the cocoon around SClA2142, including its connectivity, filament structure, and galaxy populations, highlighting the significance of long straight filaments in cosmic web studies.
Findings
Longest straight structure detected at 75 Mpc
Supercluster connectivity is C=6-7, poor groups C=1-2
Galaxies with old stellar populations found across environments
Abstract
We study the properties, connectivity, and galaxy content of groups and filaments in the low-density region (cocoon) around A2142 supercluster (SClA2142). We traced the SClA2142 cocoon boundaries by the lowest luminosity-density regions that separate SClA2142 from other superclusters. We determined galaxy filaments and groups in the cocoon and analysed the connectivity of groups, the high density core (HDC) of the supercluster, and the whole of the supercluster. We compared the distribution and properties of galaxies with different star-formation properties in the supercluster and in the cocoon. SClA2142 and the long filament that is connected to it forms the longest straight structure in the Universe detected so far, with a length of Mpc. The connectivity of the supercluster is C = 6 - 7; poor groups have C = 1 - 2. Long filaments around the supercluster's main body are…
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