Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-08-03
Astrophys.J.629:781-790,2005
Astronomy and Astrophysics
Astrophysics
12 pages, 8 figures, submitted to ApJ
Scientific paper
10.1086/430811
We present distribution functions and spatial correlations of the shapes of dark matter halos derived from Hubble Volume simulations of a LambdaCDM universe. We measure both position and velocity shapes within spheres encompassing mean density 200 times the critical value, and calibrate small-N systematic errors using Poisson realizations of isothermal spheres and higher resolution simulations. For halos more massive than 3x10^{14} Msun/h, the shape distribution function peaks at (minor/major, intermediate/major) axial ratios of (0.64,0.76) in position, and is rounder in velocity, peaking at (0.72,0.82). Halo shapes are rounder at lower mass and/or redshift; the mean minor axis ratio in position follows
Evrard August E.
Kasun S. F.
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