The Density Profile of Cluster-scale Dark Matter Halos

Details The Density Profile of Cluster-scale Dark Matter Halos The Density Profile of Cluster-scale Dark Matter Halos

2002-06-26

arxiv.org/abs/astro-ph/0206455v2

Astrophys.J. 588 (2003) L73

Astronomy and Astrophysics

Astrophysics

4 pages, 3 figures; version accepted for publication by ApJ Letters. Three figures omitted to allow space for new fig. 3 and e

Scientific paper

10.1086/375697

We measure the average gravitational shear profile of 6 massive clusters (M_vir ~ 10^15 M_sun) at z=0.3 out to a radius ~2h^-1 Mpc. The measurements are fitted to a generalized NFW-like halo model \rho(r) with an arbitrary r -> 0 slope \alpha. The data are well fitted by such a model with a central cusp with \alpha ~ 0.9 - 1.6 (68% confidence interval). For the standard-NFW case \alpha = 1.0, we find a concentration parameter c_vir that is consistent with recent predictions from high-resolution CDM N-body simulations. Our data are also well fitted by an isothermal sphere model with a softened core. For this model, our 1\sigma upper limit for the core radius corresponds to a limit \sigma_star \leq 0.1 cm^2 g^-1 on the elastic collision cross-section in a self-interacting dark matter model.

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