How the Coherent Tides Obstruct the Radial Infalls of Satellite Galaxies
  onto Clusters
  A direct numerical evidence for the obstructing effect of the coherent tides
on the infall-zone satellites around the cluster halos is presented. Analyzing
the numerical data from a high-resolution N-body simulation, we calculate the
mean fractions of the radial and tangential velocities of the infall-zone
satellites around the cluster halos and investigate if and how they depend on
the tidal coherence defined as the alignments between the major principal axes
of the local tidal fields smoothed on the linear and nonlinear scales. It is
found that the infall-zone satellites located in the regions with higher tidal
coherence have significantly smaller and larger mean fractions of the radial
and tangential velocities, respectively, which indicates that the radial infall
of satellites onto host clusters are obstructed by the coherent tides. We also
show that those satellites separated by shorter distances from the host
clusters, having lower-masses, and embedded in the anisotropic large-scale
environments like filaments and sheets, are more vulnerable to the obstructing
effect of the coherent tides.
