Galaxy populations in haloes in high-density environments
  There are hints suggesting that properties of galaxy populations in dark
matter haloes may depend on their large-scale environment. Recent works point
out that very low-density environments influence halo occupation distribution
(HOD), however there is not a similar analysis focused on high-density
environments. Here we use a simulated set of future virialized superstructures
(FVS) to analyse the occupation of galaxies in haloes within these high
globally dense regions.
  We use a publicly available simulated galaxy set constructed with a
semi-analytical model to identify FVS in the simulation. Then, we computed the
HOD within these superstructures for different absolute magnitude thresholds
and make several analysis including the comparison to the global HOD results.
We study the dependence on the results on properties of the FVS such as density
and volume as well as consider the morphology of galaxies. We also analysed the
properties of the stellar content of galaxies and the formation time of the
haloes inside FVS.
  We find a significant increase in the HOD inside FVS. This result is present
for all absolute magnitude thresholds explored. The effect is larger in the
densest regions of FVS, but does not depend on the volume of the
superstructure. We also find that the stellar-mass content of galaxies
considerably differs inside the superstructures. Low mass haloes have their
central and satellite galaxies with a higher stellar mass content (50%), and
exhibit mean star ages (20%) older than average. For massive haloes in FVS we
find that only the stellar mass of satellite galaxies varies considerably
corresponding to a decrease of 50%. We find a significant statistical
difference between the formation times of haloes in FVS and the average
population. Haloes residing in superstructures formed earlier, a fact that
leads to several changes in the HOD and their member galaxy properties.
