The Three Hundred Project: The influence of environment on simulated
  galaxy properties
  The relationship between galaxy properties and environment is a widely
discussed topic within astrophysics. Here we use galaxy samples from
hydrodynamical re-simulations to examine this relationship. We use the
over-density ($\delta_1$) within a $1 h^{-1}{\rm Mpc}$ sphere around a galaxy
to evaluate its environment. Then the relations between galaxy properties, such
as specific star formation rate(sSFR), fraction of star forming galaxies, $g-r$
colour and $\delta_1$ are examined within three galactic samples formed from
galaxies within large clusters, those in the vicinity of large clusters and
those in the field. We find tight environmental correlations for these galaxy
properties. In brief, galaxies in denser environments tend to be redder and are
more likely to be quenched. This is consistent with observations. We find that
although the sSFR decreases with $\delta_1$, this is mainly because that
galaxies with higher stellar mass reside in environment with higher
overdensity. At fixed over-density a galaxy's color is also independent of
whether it lives within a cluster or within the field, but the relative
fractions of the two samples varies dramatically with over-density and this
drives an apparent evolution.
