A correlation between accreted stellar kinematics and dark matter halo spin in the <scp>artemis</scp> simulations

Abstract We report a correlation between the presence of Gaia-Sausage-Enceladus (GSE) analogue and dark matter halo spin in artemis simulations Milky Way-like galaxies. The haloes which contain large population accreted stars on highly radial orbits (like GSE) have lower average than their counterparts with more isotropic stellar velocity distributions. median modified parameters λ′ differ by factor ∼1.7 at present-day, similar value when far from virial equilibrium are removed. also show that make up smaller proportion populations containing GSE analogue, stripped satellites masses typically ∼4 times smaller. Our findings suggest higher DM without GSE-like feature is due to mergers mass ∼1010M⊙, do not result prominent radially anisotropic features like GSE.