  Nearby clusters such as Virgo and Coma possess galaxy distributions which
tend to be aligned with the principal axis of the cluster itself. This has also
been confirmed by a recent statistical analysis of some 300 Abell clusters
where the effect has been linked to the dynamical state of the cluster.
Moreover, the orbits of satellite galaxies in galactic systems like our own
Milky Way also demonstrate a high degree of anisotropy - the so-called Holmberg
effect, the origin of which has been the subject of debate for more than 30
years. This study presents the analysis of cosmological simulations focusing on
the orbits of satellite galaxies within dark matter halos. The apocentres of
the orbits of these satellites are preferentially found within a cone of
opening angle ~40 around the major axis of the host halo, in accordance with
the observed anisotropy found in galaxy clusters. We do, however, note that a
link to the dynamical age of the cluster is not well established as both our
oldest dark matter halos do show a clear anisotropy signal. Further analysis
connects this distribution to the infall pattern of satellites along the
filaments: the orbits are determined rather by the environment of the host halo
than some "dynamical selection" during their life within the host's virial
radius.
