2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/1465We use numerical simulations to study the development of gas/star offsets in the tidal tails of merging galaxies. These offsets are shown to be a natural consequence of the radially extended HI spatial distribution in disk galaxies, coupled with internal dissipation in the gaseous component driven by the interaction. This mechanism explains the observed gas/star offsets in interacting galaxies without invoking interactions with a hot (unseen) gaseous component.2 pages, 1 Postscript figure, uses newpasp.sty. To appear in the conference proceedings of "Gas and Galaxy Evolution"Astrophysicstext