Ruchika Seth (IUCAA)
Seminar on inglise keeles.
We take a close look at the galaxies in the Coma Supercluster and assess the role of the environment (in the form of cluster, group and supercluster filament) in their evolution, in particular examining the role of groups. We characterise the groups according to intrinsic properties such as richness and halo mass, as well as their position in the supercluster and proximity to the two rich clusters, Abell 1656 (Coma) and Abell 1367. We devise a new way of characterising the local environment using a kernel density estimator. We find that the impact of the environment on galaxies is a complex combination of the overdensities on various scales and that Abell 1367 end of the supercluster is in the process of assembly at present, leading to heightened star formation activity in galaxies, in contrast with the Coma-end of the filament system.
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