An environmental dependence of the physical and structural properties in the Hydra Cluster galaxies

• Published in: arXiv.org 2020-10
• Main Authors: Lima-Dias, Ciria, Monachesi, Antonela, Torres-Flores, Sergio, Cortesi, Arianna, Hernández-Lang, Daniel, Barbosa, Carlos Eduardo, Mendes de Oliveira, Claudia, Olave-Rojas, Daniela, Pallero, Diego, Sampedro, Laura, Molino, Alberto, Herpich, Fabio R, Jaffé, Yara L, Amorín, Ricardo, Chies-Santos, Ana L, Dimauro, Paola, Telles, Eduardo, Lopes, Paulo A A, Alvarez-Candal, Alvaro, Ferrari, Fabricio, Kanaan, Antonio, Ribeiro, Tiago, Schoenell, William
• Format: Article
• Language: English
• Subjects: Algorithms; Fluid filters; Galactic clusters; Galaxies; Morphology; Properties (attributes); Star & galaxy formation; Star formation; Substructures
• ISSN: 2331-8422
• DOI: 10.48550/arxiv.2010.15235

The nearby Hydra Cluster (\(\sim\)50 Mpc) is an ideal laboratory to understand, in detail, the influence of the environment on the morphology and quenching of galaxies in dense environments. We study the Hydra cluster galaxies in the inner regions (\(1R_{200}\)) of the cluster using data from the Southern Photometric Local Universe Survey (S-PLUS), which uses 12 narrow and broad band filters in the visible region of the spectrum. We analyse structural (Sérsic index, effective radius) and physical (colours, stellar masses and star formation rates) properties. Based on this analysis, we find that \(\sim\)88 percent of the Hydra cluster galaxies are quenched. Using the Dressler-Schectman test approach, we also find that the cluster shows possible substructures. Our analysis of the phase-space diagram together with DBSCAN algorithm indicates that Hydra shows an additional substructure that appears to be in front of the cluster centre, which is still falling into it. Our results, thus, suggest that the Hydra Cluster might not be relaxed. We analyse the median Sérsic index as a function of wavelength and find that for red (\((u-r)\geq\)2.3) and early-type galaxies it displays a slight increase towards redder filters (13 and 18 percent, for red and early-type respectively) whereas for blue+green (\((u-r)\)