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We investigate mass segregation in group and cluster environments byidentifying galaxy analogues in high-resolution dark matter simulations.Subhalos identified by the AHF and ROCKSTAR halo finders have similar massfunctions, independent of resolution, but different radial distributions due tosignificantly different subhalo hierarchies. We propose a simple way toclassify subhalos as galaxy analogues. The radial distributions of galaxyanalogues agree well at large halo-centric radii for both AHF and ROCKSTAR butdisagree near parent halo centres where the phase-space information used byROCKSTAR is essential.  We see clear mass segregation at small radii (within $0.5\,r_{vir}$) withaverage galaxy analogue mass decreasing with radius. Beyond the virial radius,we find a mild trend where the average galaxy analogue mass increases withradius. These mass segregation trends are strongest in small groups anddominated by the segregation of low mass analogues. The lack of masssegregation in massive galaxy analogues suggests that the observed trends aredriven by the complex accretion histories of the parent halos rather thandynamical friction.

Uncovering Mass Segregation with Galaxy Analogues in Dark Matter Simulations