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About the Chemical Evolution of dSphs (and the peculiar Globular Cluster ω Cen)

Published online by Cambridge University Press:  01 June 2008

Andrea Marcolini  and
Annibale D'Ercole
Andrea Marcolini
Affiliation:
Centre for Astrophysics, University of Central Lancashire, Preston, Lancashire, PR1 2HE, United Kingdom email: [email protected]
Annibale D'Ercole
Affiliation:
INAF, Osservatorio Astronomico di Bologna, via Ranzani 1, 40127 Bologna, Italy email: [email protected]
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Abstract

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We present three dimensional hydrodynamical simulations aimed at studying the dynamical and chemical evolution of the interstellar medium (ISM) in isolated dwarf spheroidal galaxies (dSphs). This evolution is driven by the explosion of Type II and Type Ia supernovae, whose different contribution on both the dynamics and chemical enrichment is taken into account. Radiative losses are effective in radiating away the huge amount of energy released by SNe explosions, and the dSph is able to retain most of the gas allowing a long period (≥ 2 − 3 Gyr) of star formation, as usually observed in this kind of galaxies. We are able to reproduce the stellar metallicity distribution function (MDF) as well as the peculiar chemical properties of strongly O-depleted stars observed in several dSphs. The model also naturally predicts two different stellar populations, with an anti-correlation between [Fe/H] and velocity dispersion, similarly to what observed in the Sculptor and Fornax dSphs. These results derive from the inhomogeneous pollution of the SNe Ia, a distinctive characteristic of our model. We also applied the model to the peculiar globular cluster (GC) ω Cen in the hypothesis that it is the remnant of a formerly larger stellar system, possibly a dSph.

Keywords

hydrodynamicsmethods: numericalstars: abundancesISM: evolutionISM: abundancesgalaxies: dwarf(Galaxy:) globular clusters: individual (ω Cen)
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 4 , Issue S255: Low-Metallicity Star Formation: From the First Stars to Dwarf Galaxies , June 2008 , pp. 152 - 156
Copyright
Copyright © International Astronomical Union 2008

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