Jun 23 – 28, 2014
Europe/Zurich timezone

Baryonic and dark matter distribution features in cosmological simulations of spiral galaxies

Jun 27, 2014, 3:00 PM
Room 5 (Tuschinski Theatre)

Room 5

Tuschinski Theatre

Presentation Dark Matter: Cosmological Aspects Dark Matter: Cosmological Aspects


Pol Mollitor (L)


We study three high resolution cosmological hydrodynamical simulations of Milky Way-sized halos including a comparison with the corresponding DM-only runs performed with the adaptive mesh refinement code RAMSES. We analyse the stellar and gas distribution and find one of our simulated galaxies with interesting Milky Way like features with regard to several observational tests. Thanks to consistently tuned star formation rate and supernovae feedback, we manage to obtain an extended disk and a flat rotation curve with the circular velocity and the dark matter density in the solar neighbourhood in agreement with observations. With a careful look at the derivation of the stellar-to-halo mass ratio, we also obtain competitive values for this criterion. Concerning the dark matter distribution, we explicitly show the interaction with the baryons and show how the dark matter is first contracted by star formation and then cored by feedback processes. Analysing the clump spectrum, we find a shift in mass with regard to DM-only run and obtain a high mass satellite distribution comparable with the Milky Way spheroidal dwarf galaxies. This work will be very soon on arxiv. In this consistent framework, we may also comment on dark matter detection phenomenology which will be the subject of subsequent papers.

Primary author


Emmanuel Nezri (CNRS) Prof. Romain Teyssier (Institute for Theoretical Physics, University of Zurich)

Presentation materials