Is ram pressure enhanced by cluster mergers?

In a hierarchical Universe, galaxy clusters continue to grow with cosmic time, and thus a large number of them are disturbed by the accretion of groups or major collisions. Hydrodynamical simulations show that ram pressure stripping can be enhanced during cluster interactions providing an alternative way of forming jellyfish galaxies. In this work, we use X-ray, optical, and radio data to robustly investigate this hypothesis, supplying a statistical analysis of the incidence of the jellyfish galaxies from the WINGS, OmegaWINGS, and GASP surveys with respect to the dynamical state of their host clusters. We found that disturbed clusters tend to be more massive and host less ram pressure stripping candidates than the relaxed clusters. Our conclusions hold even when the counting is done in different fractions of R200 and correcting by the infalling population. These results are twice counter-intuitive since in massive clusters the higher gas density leads to stronger ram-pressure and that in messy environments the higher relative velocity between the gas and the galaxies should also provide a ram-pressure enhancement.