The Dark Matter Distribution in the Central Regions of Galaxy Clusters

Details The Dark Matter Distribution in the Central Regions of Galaxy Clusters The Dark Matter Distribution in the Central Regions of Galaxy Clusters

2003-10-24

arxiv.org/abs/astro-ph/0310703v1

Astrophys.J.604:88-107,2004

Astronomy and Astrophysics

Astrophysics

Proceedings contribution, XVth Rencontres de Blois

Scientific paper

10.1086/382146

Cosmological N-body simulations predict that dark matter halos should have a universal shape characterized by a steep, cuspy inner profile. Here we report on a spectroscopic study of six clusters each containing a dominant brightest cluster galaxy (BCG) with nearby gravitational arcs. Three clusters have both radial and tangential gravitational arcs, whereas the other three display only tangential arcs. We analyze stellar velocity dispersion data for the BCGs in conjunction with the arc redshifts and lens models to constrain the dark and baryonic mass profiles jointly. For those clusters with radial gravitational arcs we were able to measure precisely the inner slope of the dark matter halo and compare it with that predicted from CDM simulations.

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