Galaxy and mass assembly (GAMA): the clustering of galaxy groups

ABSTRACT We explore the clustering of galaxy groups in Galaxy and Mass Assembly (GAMA) survey to investigate dependence group bias profile on separation scale mass. Due inherent uncertainty estimating selection function, hence autocorrelation we instead measure projected galaxy–group cross-correlation function. find that has a strong mass scales $r_\bot \lesssim 1 h^{-1}$. also evidence most massive live extended, overdense, structures. In first application marked statistics groups, group-mass peaks comparable typical radius r⊥ ≈ 0.5 h−1. While galaxies are associated with show no indication segregation within groups. similar results from IllustrisTNG simulations L-Galaxies model, although shows an enhanced small scales.