The age dependence of halo clustering

摘要: We use a very large simulation of the concordance Λ cold dark matter cosmogony to study clustering haloes. For haloes less massive than about 1013 h−1 M⊙ amplitude two-point correlation function on scales depends strongly halo formation time. Haloes that assembled at high redshift are substantially more clustered those recently. The effect is smooth time and its increases with decreasing mass. At 1011 h−1 M⊙ ‘oldest’ 10 per cent five times correlated ‘youngest’ cent. This unexpected result incompatible standard excursion set theory for structure growth, it contradicts fundamental assumption occupation distribution models often used galaxy clustering, namely content given mass statistically independent larger scale environment.