Type: Talk
Session: Galaxies Science from Dwarfs to Clusters
Author: Amrutha Belwadi Manjunatha

Abstract: Galaxy clusters are the largest known gravitationally collapsed dark matter halos formed in the Universe. These virialized structures are formed by continual accretion of lower mass halos such as galaxies and galaxy groups. From visual observations, galaxy clusters are the most populous aggregation of galaxies. However, the spatially extended X-ray emission allows us to identify galaxy clusters and their groups with clarity. Here, we present our study based on 20 Planck-selected massive clusters at 0.2<z<0.5, including Abell 2744 and SMACS0723. For our work, we mainly use the existing Visible and Infrared Survey Telescope for Astronomy (VISTA) J and K band near-infrared imaging to identify the potential galaxies at the cluster redshift. Then, we apply a two-step identification strategy of galaxy groups around these clusters, that is, X-ray Multi Mirror (XMM)-Newton X-ray imaging and Friends-of-Friends (FoF) algorithm using optical griz Dark Energy Camera (DECam) DR10 data. This combination of spatial distribution of galaxies along with the extended X-ray emissions, allows us to identify the in-falling galaxy groups and study the pre-processing in galaxies. Additionally, with our multi-wavelength analysis of 20 galaxy clusters, we study the effect of environmental processes on quenching of cluster galaxies. This analysis can be considered as a precursor to the science achievable with the combination of all sky surveys such as the eROSITA X-ray detections of galaxy groups, Euclid data and LSST data on a broad scale.