Mergers and the outside-in formation of dwarf spheroidals

19 Nov 2015 Alejandro Benítez-Llambay Julio F. Navarro Mario G. Abadi Stefan Gottloeber Gustavo Yepes Yehuda Hoffman Matthias Steinmetz

We use a cosmological simulation of the formation of the Local Group to explore the origin of age and metallicity gradients in dwarf spheroidal galaxies. We find that a number of simulated dwarfs form "outside-in", with an old, metal-poor population that surrounds a younger, more concentrated metal-rich component, reminiscent of dwarf spheroidals like Sculptor or Sextans... (read more)

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