English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We study galaxy populations and search for possible merging substructures inthe rich galaxy cluster A2142. Normal mixture modelling revealed in A2142several infalling galaxy groups and subclusters. The projected phase spacediagram was used to analyse the dynamics of the cluster and study thedistribution of various galaxy populations in the cluster and subclusters. Thecluster, supercluster, BCGs, and one infalling subcluster are aligned. Theirorientation is correlated with the alignment of the radio and X-ray haloes ofthe cluster. Galaxies in the centre of the main cluster at the clustercentricdistances $0.5~h^{-1}Mpc$ have older stellar populations (with the median ageof $10 - 11$~Gyrs) than galaxies at larger clustercentric distances.Star-forming and recently quenched galaxies are located mostly in the infallregion at the clustercentric distances $D_{\mathrm{c}} \approx 1.8~h^{-1}Mpc$,where the median age of stellar populations of galaxies is about $2$~Gyrs.Galaxies in A2142 have higher stellar masses, lower star formation rates, andredder colours than galaxies in other rich groups. The total mass in infallinggroups and subclusters is $M \approx 6\times10^{14}h^{-1}M_\odot$,approximately half of the mass of the cluster, sufficient for the mass growthof the cluster from redshift $z = 0.5$ (half-mass epoch) to the present. Thecluster A2142 may have formed as a result of past and present mergers andinfallen groups, predominantly along the supercluster axis. Mergers causecomplex radio and X-ray structure of the cluster and affect the properties ofgalaxies in the cluster, especially in the infall region. Explaining thedifferences between galaxy populations, mass, and richness of A2142, and othergroups and clusters may lead to better insight about the formation andevolution of rich galaxy clusters.

Infalling groups and galaxy transformations in the cluster A2142