What process strips gas from infalling spiral galaxies via the ICM?

Ram-pressure stripping

Galaxies that fall into the dense environment of a galaxy cluster experience significant environmental effects that alter their evolution. One crucial mechanism affecting infalling spiral galaxies, like the Milky Way, is ram-pressure stripping. This occurs when the galaxy moves at high speed through the dense, superheated plasma of the Intracluster Medium (ICM). The pressure exerted by this dense gas effectively strips away the galaxy's internal gas reserves. Since this gas is essential for ongoing star formation, removing it halts the process, causing the spiral galaxy to evolve rapidly into a 'red and dead' elliptical or lenticular type galaxy, particularly as it nears the cluster core.