Characterization of a Jellyfish Galaxies Population in X-ray Clusters Surveys

Abstract

This thesis work involved the characterization of a population of confirmed Jellyfish galaxies within hosts with a wide range of mass, including groups and clusters of galaxies, with masses M ≥ 1013M⊙. The hosts were observed by X-ray surveys MCXC and RXGCC, both were used used to collect data from galaxies observed with the Subaru visible telescope from Hyper Suprime Cam Survey Public Data Realese 3. High-quality RGB images were generated from these observations for the identification and confirmation of galaxies undergoing Ram Pressure Stripping (RPS) by a visual inspection employed for experts and with citizen science component using the Galaxy Zoo portal that allowed us to classify all the main sample, while a sub-set of galaxies were classified by experts. Our analysis in the confirmed Jellyfish samples revealed a slight correlation in the occurrence of Jellyfish galaxies with increasing host mass, with an approximate 5% change. Additionally, a correlation was found between the angular distance Jellyfish galaxy to Host centre and parameters of the intracluster medium’s (ICM) gas density distribution, β and rcore. Hosts with concentrated density had Jellyfish galaxies closer to the center, while those with more extended and flatter distributions don’t present Jellyfish galaxies at nearby distances to the hosts centre. The distribution of galaxy tails was also studied, indicating that tail direction frequently points away from the cluster when hosts are more massive, while tail directions frequently align with the group when they are less massive hosts. This preliminary and general description is based on the analysis of 333 galaxies voted on by experts and an official sample of 5252 galaxies, which will be incorporated for further investigation.