Résumé / Abstract Journal-club_Postdoc

Journal-club Postdoc

« Galaxy formation in cosmological zoom simulations »

Michaela Hirschmann

I present some of my recent work on the effect of stellar feedback and
metal enrichment on the evolution of galaxies using a sample of 45
high-resolution cosmological zoom simulations. The zoom simulations
include an empirical model for momentum-driven galactic winds, which are
found to be successful in suppressing early star formation, in increasing
cold gas fractions (due to re-accretion of gas), thus, also in reducing
the baryon conversion efficiencies for low mass halos in reasonable
agreement with observations at various cosmic epochs from z=3 to the
present day. In addition, models with galactic winds result in massive
galaxies with steep stellar metallicity gradients originating from the
hierarchical accretion of low metallicity stars from lower mass
satellites. These results provide a possible explanation for the origin
and evolution of abundance gradients of massive galaxies in hierarchical
cosmological models.
mercredi 26 novembre 2014 - 11:00
Salle des séminaires Évry Schatzman, Institut d'Astrophysique
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