Mercoledi 23 Ottobre 2019, h. 11:30 

 Aula Jappelli Osservatorio Astronomico

  Mayte Alfaro Cuello 

Max Planck, Heidelberg

  Into the heart of the nucleus of the Sagittarius dwarf spheroidal galaxy: M54 




Nuclear star clusters (NSCs) are the densest stellar systems in the universe with masses of 10^5-10^8Msol and a half-light radius of 1 to 10pc. They reside in the center of ~75% of galaxies across the Hubble sequence, including a high fraction of dwarf galaxies. NSCs host multiple stellar populations, and coexist with supermassive black holes as observed in the Milky Way. High-mass and chemical complex globular clusters (GCs) are found to exhibit similar characteristics to NSCs in dwarf galaxies. This suggests that some Galactic GCs coul be former NSCs, remnants of dwarf galaxies accreted by the Milky Way. M54, the NSC of the Sagittarius dwarf spheroidal galaxy is an outstanding example of this class of objects. As it still lies at the center of its host, M54 provides the unique opportunity to understand low-mass galaxy nuclei in their original environments. In this talk, I will present a large MUSE data set covering out to ∼2.5 effective radii of M54 and including the spectra extracted for ∼6600 member stars. From this extensive amount of data, we could recover the star formation history of this NSC, detecting at least three stellar populations whose characteristics suggest that they have different origins.




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