Rob Crain (Leiden)
"Eagle: Evolution and Assembly of GaLaxies and their Environments"
Abstract. I will introduce "Eagle", a new flagship suite of cosmological hydrodynamic simulations of galaxy evolution that adopt the new Planck cosmogony. Eagle incorporates element-by-element radiative cooling, stellar evolution and chemical enrichment, gas recycling, the growth and merging of black holes (BH), and feedback from stars & active galactic nuclei. Eagle also adopts a new formulation of the SPH algorithm that significantly improves the treatment of macroscopic fluid instabilities. I will demonstrate how calibration of the metallicity-dependence of the fraction of the stellar feedback energy that is lost on subgrid scales yields a fiducial model that reproduces the present day galaxy mass function (plus many other key observables). This calibration is based on local gas properties, and so avoids the commonplace coupling of interstellar medium physics to physically unrelated quantities such as halo mass or dark matter velocity dispersion. Moreover, the simulations do not require the ad-hoc or unphysical schemes that are often used to boost the 'numerical efficiency' of feedback in hydro simulations. Eagle therefore represents a valuable new model with which to interpret observational datasets and to assist our understanding of the complex, dynamic physics of galaxy formation.
Held in the AAO Meeting Room (Room 7, 1st Floor, Building 2) at 11:00 AM on Thursday, 20 June 2013back