Properties of filaments extracted by different tracers

D. Zakharova, B. Vulkani, G. De Lucia


Filaments that connect groups and clusters of galaxies are a key environment in the universe and our understanding of matter in the Universe is closely related to that of filaments. The main goal of my work is to shed light on the processes that regulate galaxy evolution in filaments from a theoretical point of view, using the GAEA semi analytic model (De Lucia Blaizot (2007), Xie et. al (2022)). In my current work I focused on extracting filaments from the model, exploiting a publicity available code called DisPerSE. In the literature, typically filaments are defined only using galaxies, assuming that these are good tracers of the dark matter distribution. My goal was to test this assumption and I extracted filaments both using galaxies and dark matter particles. I applied a number of methods to compare the properties of filaments based on the different tracers and started investigating the properties of galaxies within the filaments, such as stellar mass and star formation rates. In my talk, I will discuss how filaments extracted using different tracers vary in a number of geometric properties and why that these differences can be neglected in the statistical analysis of galaxies properties or observations.