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We present a new approach for chemical evolution modelling, specificallydesigned to investigate the chemical properties of dwarf galaxies in a fullcosmological framework. In particular, we focus on the Sculptor dwarfspheroidal galaxy as a test bed for our model. We select four candidateSculptor-like galaxies from the satellite galaxy catalogue generated byimplementation of a version of the Munich semi-analytic model for galaxyformation on the level 2 Aquarius dark matter simulations. We follow explicitlythe evolution of several chemical elements, both in the cold gas out of whichthe stars form and in the hot medium residing in the halo. We take into accountin detail the lifetimes of stars of different initial masses, the distributionof the delay times for type Ia supernova explosions and the dependency of thestellar yields from the initial metallicity of the stars. We allow largefractions of metals to be deposited into the hot phase, either directly asstars die or through reheated gas flows powered by supernova explosions. Inorder to reproduce both the observed metallicity distribution function and theobserved abundance ratios of long-lived stars of Sculptor, large fractions ofthe reheated metals must never re-enter regions of active star formation. Ouranalysis sets further constraints on the semi-analytical models and, at large,on possible metal enrichment scenarios for the Sculptor dwarf spheroidalgalaxy.

monthly notices of the royal astronomical society

Chemical evolution of Local Group dwarf galaxies in a cosmological  context -- I. A new modelling approach and its application to the Sculptor  dwarf spheroidal galaxy