Schedule Feb 17, 2012
Eris vs Dark Eris: The Effects of Baryons on Dark-Matter Haloes with SPH
Annalisa Pillepich (UCSC, UCO)

The effects of baryonic infall and star formation on the dark matter distribution within haloes is highly debated and yet a core element of our understanding of galaxy formation. We compare the dark-matter density profiles and substructure properties of two "identical" late-type spirals, "Eris" of Guedes et al. 2011 (2011ApJ...742...76) and "DarkEris" of Pillepich et al. 2012 (in preparation), simulated respectively with and without including baryon physics and dynamics, using the N-body/SPH code Gasoline. We investigate the effects that gas dynamics, supernova feedback, and star-formation recipes have on the global properties of a Milky-Way-like halo, on halo contraction, on its satellites population, and thus on their radial distribution, density profiles, and their response to tidal stripping and dynamical friction.


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