The Dependence of Dark Halo Clustering on Formation Epoch and Concentration Parameter

By Yipeng Jing, Y. Suto, H. Mo. 2006

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We examine the age dependence of dark matter halo clustering at an unprecedented accuracy using a set of seven high-resolution cosmological simulations, each with N = 10243 particles. We measure the bias parameters for halos over a large mass range using the cross-power-spectrum method that can effectively suppress the random noise, even in the sparse sampling of the most massive halos. This enables us to find, for the first time, that younger halos are more strongly clustered than older ones for halo masses M > 10M*, where M* is the characteristic nonlinear mass scale. For M < M*, our results confirm the previous finding of Gao et al. that older halos are clustered more strongly than the younger ones. We also study the halo bias as a function of halo concentration, and find that the concentration dependence is weaker than the age dependence for M < M*, but stronger for M ≳ 50M*. The accurate and robust measurement of the age dependences of halo bias points to a limitation of the simple excursion-set theory, which predicts that the formation and structure of a halo of given mass is independent of its environment.

Subfields: Astronomy and Astrophysics, Ecology, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/f9a72958a8e9d3eb5d53ae33467a96697d5ed22e

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Citations in the corpus

Galaxy Evolution from Halo Occupation Distribution Modeling of DEEP2 and SDSS Galaxy Clustering (2007, background): “Gao et al. (2005) find in simulations a signature of age-dependent halo clustering (the so-called “halo assembly bias”, see also Croton et al. 2007; Jing et al. 2007; Harker et al. 2006; Wechsler et al. 2006; Wetzel et al. 2007; Zhu et al. 2006; Gao & White 2007).”
THE UNORTHODOX ORBITS OF SUBSTRUCTURE HALOS (2008, result): “The same effect may also introduce a substantial environmental dependence in the formation-time dependence of halo clustering reported in recent studies (Gao et al 2005; Zhu et al 2006; Jing et al 2007; see also Diemand et al 2007b).”
HALO OCCUPATION DISTRIBUTION MODELING OF CLUSTERING OF LUMINOUS RED GALAXIES (2008, methodology): “Jing et al. (2007) performed N-body simulations with 10243 particles in a box of 1800 h−1Mpc on a side.”