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Recent observations have shown that the majority of the Andromeda galaxy'ssatellites are aligned in a thin plane. On the theoretical side it has beenproposed that galaxies acquire their gas via cold streams. In addition,numerical simulations show that the same streams also deliver gas clumps whichcould potentially develop into satellite galaxies. Assuming that cold streamsare a major source of satellite systems around galaxies we calculate theprobabilities in two different models to find a certain fraction of satelliteswithin a thin plane around the central galaxy of the host halo with and withouthaving the same sense of rotation. Using simple geometrical considerations andadopting a random orientation of the streams we demonstrate that the vast thindisk of satellites detected around Andromeda can naturally be explained withinthis framework. In fact, without any satellite scattering, two streams wouldlead to too many satellites in the thin plane, compared with the observations.Three streams reproduce the observations very well. Natural implications fromour model are that all massive galaxies should have a thin plane of satellitesand that the satellites should naturally distribute themselves not only into asingle plane but into several inclined ones. We estimate the effect ofadditional satellites accreted from random directions and find it to be ofminor relevance for a mild inflow of satellites from random directions.

The co-planarity of satellite galaxies delivered by randomly aligned cold mode accretion streams