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The formation of galaxy clusters is a complicated process that probablyinvolves the accretion of galaxies in groups, as observed in nearby clusters,such as Virgo and Fornax. The members of the groups undergo "preprocessing"prior to cluster infall, which affects their stellar populations andmorphology. In this paper I present an extreme example of such an accretionevent selected from the IllustrisTNG100 simulation. The group, composed ofthree full-sized disky galaxies and a number of smaller satellites, is accretedearly, with the first pericenter around the cluster at redshift z=1.3. Beforethe infall, the three galaxies interact strongly in pairs within the group,which produces tidally induced bars in the two more massive ones. Theinteractions also lead to mass exchange and trigger some star formationactivity resulting in temporary rejuvenation of their stellar populations.After infall, they all undergo seven pericenter passages around the cluster,experiencing strong mass loss in the dark matter and gas components, as well asreddening of the stellar populations. Their tidally induced bars are, however,preserved and even enhanced probably due to the loss of gas via ram-pressurestripping in the intracluster medium. The study demonstrates that groupaccretion can happen very early in cluster formation and proposes anotherscenario for the formation of tidally induced bars.

Preprocessing in small groups: Three simulated galaxies interacting prior to cluster infall