The environment of galaxies is usually defined from number density measurements in galaxy catalogues or by considering the dichotomic cluster/field membership. However, there are limitations in both techniques and, by considering the large-scale structure (LSS), we need to refine the classification of the distinct environments. In a general sense, the cosmic web can be separated in, at least, four regions: knots (clusters and groups of galaxies), filaments, sheets and voids, in the sense of decreasing density. We have been studying the environment of galaxies in this cosmic web, more specifically considering the LSS unities defined as superclusters of galaxies. In this work we will present some results on identifying knots and filaments inside superclusters of galaxies and studying the effect of these structures over the evolution of the hosted galaxies. Specifically, we have found that filaments have diameters of typically 2.5 h_{70}^{-1} Mpc and density contrasts higher than 3 (average 10) respect to their surroundings. Also, the stellar masses of galaxies hosted in these filaments were found to be larger (up to 25% on average) than the ones of galaxies in the dispersed component of the supercluster. We also confirm that the morfology-density relation is valid for the filaments and, inside these structures, up to 70% of the galaxies have early-types. We further report effects over the activity of the galaxies.
Enviado por caretta@astro.ugto.mx, 2019 Oct