Nine M giants in the Milky Way's nuclear star cluster show alpha-element abundances that decrease with metallicity and match the inner bulge, suggesting a shared, early star-formation history.
The Formation of the Milky Way Nuclear Cluster
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abstract
Nuclear Star Clusters are observed at the center of many galaxies. In particular in the center of the Milky Way the Nuclear Star Cluster coexists with a cen- tral supermassive black hole. The origin of these clusters is still unknown; a possible formation mechanism is the decay of massive globular clusters driven inward to the galactic center by dynamical friction and their subsequent merging. By investigating this scenario by means of sophisticated N-body simulations we found that this process could lead to a final product which actually shows many of the observed features of the Milky Way Nuclear Star Cluster.
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Chemical Abundances in the Nuclear Star Cluster of the Milky Way: alpha-Element Trends and Their Similarities with the Inner Bulge
Nine M giants in the Milky Way's nuclear star cluster show alpha-element abundances that decrease with metallicity and match the inner bulge, suggesting a shared, early star-formation history.