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We propose that the accretion of a dwarf spheroidal galaxy provides a commonorigin for the giant southern stream and the warp of M31. We run about 40 fullN-body simulations with live M31, infalling galaxies with varying masses anddensity profiles, and cosmologically-plausible initial orbital parameters.Excellent agreement with a full range of observational data is obtained for amodel in which a dark-matter-rich dwarf spheroidal, whose trajectory lies onthe thin plane of corotating satellites of M31, is accreted from its turnaroundradius of about 200 kpcs into M31 at approximately 3 Gyrs ago. The satellite isdisrupted as it orbits in the potential well of the galaxy and forms the giantstream and in return heats and warps the disk of M31. We show that ourcosmologically-motivated model is favoured by the kinematic data over thephenomenological models in which the satellite starts its infall from a closedistance of M31. Our model predicts that the remnant of the disrupted satelliteresides in the region of the North-Eastern shelf of M31. The results heresuggest that the surviving satellites of M31 that orbit on the same thin plane,as the disrupted satellite once did, could have all been accreted from anintergalactic filament.

A single-merger scenario for the formation of the giant stream and the warp of M31