Effects of baryons on dark matter haloes

PEDROSA, S.; TISSERA, P.B.; SCANNAPIECO, C.

La Plata, Buenos Aires

Congreso; 52 Reunión Anual de la Asociación Argentina de Astronomía; 2009

Asociación Argentina de Astronomía

We analyse the dark matter (DM) distribution in ≈ 1012 M⊙ mass haloes extracted from simulations consistent with the concordance cosmology. We study a set of simulations of intermediate numerical res- olution where the physics regulating the transformation of gas into stars was allowed to change producing galaxies with different morphologies. Although in all cases the DM profiles get more concentrated as baryons are collected at the centre of the haloes compared to the pure dynamical case, DM-o, the total baryonic mass alone is not enough to fully predict the reaction of the profile. Our findings suggest that the response of the DM halo is driven by the history of assembly of baryons into a galaxy.