Physics
Scientific paper
Jul 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002hst..prop.9527t&link_type=abstract
HST Proposal ID #9527
Physics
Hst Proposal Id #9527 Cosmology
Scientific paper
We propose to develop a powerful method for measuring the shape of the dark matter halo in the inner region of clusters, thus testing a fundamental prediction of the Cold Dark Matter paradigm. Specifically, we will identify in the HST archive cD galaxies with associated giant arcs and measure their extended kinematic profiles using the Keck telescopes. We have already obtained data for 4 systems {2 newly-discovered ones} demonstrating the feasibility of the project. The combination of the two independent constraints from dynamics and lensing on the same objects will allow us to overcome the degeneracies inherent to each method and thus to reliably measure the shape of the dark matter halo on 1-100 kpc scales. With this proposal we seek the necessary funding to: i} perfom a systematic search for arcs in the entire HST cluster archival data in order to collect a sample of 10-20 objects; ii} develop methods and software for the joint analysis of the kinematic and lensing constraints.
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