Anisotropic satellite infall in a ΛCDM Universe

SGRÓ, MARIO AGUSTÍN; VILLALÓN, CAROLINA; GARCÍA LAMBAS, DIEGO

Cartagena de Indias

Congreso; LARIM 2016; 2016

This abstract summarizes our oral contribution to the conference. We use a dark matter only simulation to study the accretion of satellites in the ΛCDM model. The large volume and resolution of the simulation enabled us to identify ∼ 200.000 massive host haloes (M_{vir} ≥ 1 × 10^{13} M_{sun}) surrounded by ∼ 700.000 satellites. This sample allowed us tostudy the radial velocity profiles of all satellites as a function of their distance to the primary object. Furthermore, we analysed the dependence of the radial velocity distribution with respect to the mass of the host and its principal inertia axes, as well as the properties of the haloes that are being accreted, such as their mass and specific angular momentum.We find an excess of inflowing and outflowing satellites in the radial velocity - distance phase-space, being the outflow excess higher in the high mass hosts subsample. Moreover, we show that the excess ofinfalling satellites is present at all distances for high mass hosts, even near the centre of the host halo.