Density Jumps Near the Virial Radius of Galaxy Clusters
  Recent simulations have indicated that the dark matter halos of galaxy
clusters should feature steep density jumps near the virial radius. Since the
member galaxies are expected to follow similar collisionless dynamics as the
dark matter, the galaxy density profile should show such a feature as well. We
examine the potential of current datasets to test this prediction by selecting
cluster members for a sample of 56 low-redshift (0.1<z<0.3) galaxy clusters,
constructing their projected number density profiles, and fitting them with two
profiles, one with a steep density jump and one without. Additionally, we
investigate the presence of a jump using a non-parametric spline approach. We
find that some of these clusters show strong evidence for a model with a
density jump. We discuss avenues for further analysis of the density jump with
future datasets.
