Antoine Bouchard
E. de Blok, B. Holwerda, S.L. Blyth, K. van der Heyden
The Environmental Impact on Galaxy Evolution: Highlighting the Structure of the Local Cosmic Web
Galaxy properties are known to vary across different environments. Higher density environments have generally higher fraction of early type galaxies than low density ones which are dominated by late types. I will present the results of deep, systematic HI and Halpha surveys of galaxies in various environment, namely the Local, Centaurus A and Sculptor groups. These data are used to perform a quantified analysis of the morphology-density relationship in the Local Universe. In general, the relation is relatively easy to observe, however a population of galaxies clearly depart from the correlation. These objects may be on their first infall into their respective environment. This analysis allows to extract a wealth of information, not only on galaxy evolution mechanisms and local HI mass function but also on the global structure of groups and filament in the Local Universe. With the advent of SKA pathfinders, targeted volume limited and deep blind HI surveys will allow to extend our knowledge of the Local structure and its effect on the evolution of galaxies, thereby highlighting the Local Cosmic Web.