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In several interacting systems, gas accumulations as massive as 10^9 solarmasses are observed near the tip of tidal tails, and are thought to be possibleprogenitors of Tidal Dwarf Galaxies. Using N-body simulations of galaxyinteractions, we show that the existence of such features requires that darkmatter haloes around spiral galaxies extend at least ten times further than thestellar disks. The massive gas clouds formed in our simulations have akinematical origin and gravitationally collapse into dwarf galaxies that oftensurvive for a few billion years.Comment: Accepted for publication in A&A 4 pages, 3 figure

The large extent of dark matter haloes probed by the formation of tidal dwarf galaxies