Environmental density of galaxies from SDSS via Voronoi tessellation. Issue Volume 11:Issue S308(2015) (12th October 2016) - Dobrycheva, D.
Abstract: The aim of our work was to determine the environmental density of galaxies from SDSS DR9 using the Voronoi tessellation. We constructed the 3D Voronoi tessellation for the volume-limited galaxy sample within 0.02 < z <0.1 and -24 M r -20.7 using an inverse volume of Voronoi cell as a parameter describing the local environmental density of a galaxy. It allowed us to inspect the morphology - density relation. We obtained that the early type galaxies prefer to reside in the Voronoi cells of smaller volumes (i.e. dense environments) than the late type galaxies, which are located in the larger Voronoi cells (i.e. sparse environments).