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A central tenet of the current cosmological paradigm is that galaxies growover time through the accretion of smaller systems. Here, we present newkinematic measurements near the centre of one of the densest pronouncedsubstructures, the South-West Cloud, in the outer halo of our nearest giantneighbour, the Andromeda galaxy. These observations reveal that the kinematicproperties of this region of the South-West Cloud are consistent with those ofPA-8, a globular cluster previously shown to be co-spatial with the stellarsubstructure. In this sense the situation is reminiscent of the handful ofglobular clusters that sit near the heart of the Sagittarius dwarf galaxy, asystem that is currently being accreted into the Milky Way, confirming thataccretion deposits not only stars but also globular clusters into the halos oflarge galaxies.

Accretion in action: phase space coherence of stellar debris and globular clusters in Andromeda's South-West Cloud