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

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arxiv 1408.5974 v1 pith:TMHVOVU4 submitted 2014-08-26 astro-ph.GA

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

classification astro-ph.GA
keywords globularaccretioncloudclusterssouth-westandromedagalaxiesgalaxy
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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A central tenet of the current cosmological paradigm is that galaxies grow over time through the accretion of smaller systems. Here, we present new kinematic measurements near the centre of one of the densest pronounced substructures, the South-West Cloud, in the outer halo of our nearest giant neighbour, the Andromeda galaxy. These observations reveal that the kinematic properties of this region of the South-West Cloud are consistent with those of PA-8, a globular cluster previously shown to be co-spatial with the stellar substructure. In this sense the situation is reminiscent of the handful of globular clusters that sit near the heart of the Sagittarius dwarf galaxy, a system that is currently being accreted into the Milky Way, confirming that accretion deposits not only stars but also globular clusters into the halos of large galaxies.

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