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We take a close look at the galaxies in the Coma Supercluster and assess therole of the environment (in the form of cluster, group and superclusterfilament) in their evolution, in particular examining the role of groups. Wecharacterise the groups according to intrinsic properties such as richness andhalo mass, as well as their position in the supercluster and proximity to thetwo rich clusters, Abell 1656 (Coma) and Abell 1367. We devise a new way ofcharacterising the local environment using a kernel density estimator. We findthat apart from the dominant effects of the galaxy mass, the effect of theenvironment on galaxies is a complex combination of the overdensities onvarious scales, which is characterised in terms of membership of groups, andalso of the position of the galaxy on filaments and their proximity to theinfall regions of clusters. Whether the gas can be turned into stars dependsupon the level of pre-processing, which plays a role in how star formation isenhanced in a given environment. Our results are consistent with gas accretedin the cold mode from the filaments, being made available to enhance starformation. Finally, we show that the Abell~1367 end of the supercluster is inthe process of assembly at present, leading to heightened star formationactivity, in contrast with the Coma-end of the filament system.

Evolution of galaxies in groups in the Coma Supercluster