arXiv: Cosmology and Nongalactic Astrophysics | 2019
The radius, at which a galaxy group stops the Hubble stream, and the group mass: an exact analytical solution.
Abstract
The gravitational field of a galaxy group or cluster slows down the Hubble stream and turns it speed to zero at some radius $R_0$. We offer an exact analytical relation between $R_0$ and the mass of the group.