In the Large-Scale-Structure (LSS) artifacts named fingers-of-god are apparent in the redshift space and justified by
"The large velocities that lead to this effect are associated with the gravity of the cluster by means of the virial theorem; they change the observed redshifts of the galaxies in the cluster"
There are few references, (Jackson 1972) (*), and Annu. Rev. Astron. Astrophys. 1988. 26: 631-86 in the WP article and I do no understand how the radial direction preference is justified and I could not find any source.
I've never heard of a N-Body simulation on Large Scale able to reproduce those artifacts. Am I correct? Can anyone make this issue more clear, please ?
(*) it is more a no-go than an explanation.