Properties of galaxy dark matter halos from weak lensing

Details Properties of galaxy dark matter halos from weak lensing Properties of galaxy dark matter halos from weak lensing

2003-10-27

arxiv.org/abs/astro-ph/0310756v1

Astronomy and Astrophysics

Astrophysics

To appear in IAU Symposium 220, "Dark Matter in Galaxies", ed. Stuart Ryder, D.J. Pisano, Mark walker & Ken Freeman, Publ. Ast

Scientific paper

We present the results of a study of the average mass profile around galaxies using weak gravitational lensing. We use 45.5 deg^2 of R_C band imaging data from the Red-Sequence Cluster Survey (RCS) and define a sample of 1.2\times 10^5 lenses with 19.5=0.20^{+0.04}_{-0.05}, in fair agreement with results from numerical simulations of CDM. Alternative theories of gravity (without dark matter) predict an isotropic lensing signal, which is excluded with 99.5% confidence. Hence, our results provide strong support for the existence of dark matter.

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