The Clustering of Massive Halos

Details The Clustering of Massive Halos The Clustering of Massive Halos

2006-06-28

arxiv.org/abs/astro-ph/0606699v2

Astrophys.J.656:139-147,2007

Astronomy and Astrophysics

Astrophysics

10 pages, 8 figures; text improved, references and one figure added; accepted for publication in ApJ

Scientific paper

10.1086/510444

The clustering properties of dark matter halos are a firm prediction of modern theories of structure formation. We use two large volume, high-resolution N-body simulations to study how the correlation function of massive dark matter halos depends upon their mass and formation history. We find that halos with the lowest concentrations are presently more clustered than those of higher concentration, the size of the effect increasing with halo mass; this agrees with trends found in studies of lower mass halos. The clustering dependence on other characterizations of the full mass accretion history appears weaker than the effect with concentration. Using the integrated correlation function, marked correlation functions, and a power-law fit to the correlation function, we find evidence that halos which have recently undergone a major merger or a large mass gain have slightly enhanced clustering relative to a randomly chosen population with the same mass distribution.

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