Evolution of HOD and galaxy properties in filaments and nodes of the cosmic web

We study the evolution of the Halo Occupation Distribution (HOD) and galaxy properties of nodes and filamentary structures obtained by DisPerSE from the Illustris TNG300-1 hydrodynamical simulation, in the redshift range 0 ≤ z ≤ 2. We compute the HOD in filaments and nodes and fit the HOD parameters to study their evolution, taking into account both faint and bright galaxies. In nodes, the number of faint galaxies increases with the decreasing redshift in the low-mass halos, while no significant differences are seen in the high-mass halos. Limiting the HOD to bright galaxies shows that the halos increase in mass more than the number of bright galaxies they accrete. For filaments, no large differences in HOD are found for faint galaxies, although for brighter galaxies the behaviour is similar to that for nodes. The HOD parametrization suggests that filaments have no effect on the mass required to host a galaxy (central or satellite), whereas nodes do. The results of the study indicate that filaments do not seem to affect the stellar mass content of galaxies. In contrast, nodes appear to affect halos with masses below approximately 10^12.5 h^-1 M_⊙ at local redshift. The analysis of the galaxy colour evolution shows a reddening towards lower redshift, although these processes seem to be more efficient in massive halos, with a strong effect on the bright galaxies. The general evolution suggests that the building of galaxy population within halos is influenced by both the accretion of faint galaxies and the mass growth of the bright ones.