Relative distribution of dark matter, gas, and stars around cosmic filaments in the IllustrisTNG simulation

Abstract

We present a comprehensive study of the distribution of matter around different populations of large-scale cosmic filaments, using the IllustrisTNG simulation at za =a 0. We computed the dark matter (DM), gas, and stellar radial density profiles of filaments, and we characterise the distribution of the baryon fraction in these structures. We find that baryons exactly follow the underlying DM distribution only down to ra a a 7 Mpc to the filament spines. At shorter distances (ra