Mathematics – Logic
Scientific paper
Jul 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009hst..prop12246s&link_type=abstract
HST Proposal ID #12246. Cycle 18
Mathematics
Logic
Scientific paper
We request observations of a uniformly selected sample of high mass galaxy clusters at redshift 0.58 < z < 0.88, in order to obtain weak lensing mass measurements of these systems. The clusters are drawn from the sample detected by the South Pole Telescope using the spectral distortion that high mass clusters impose on the Cosmic Microwave Background, the Sunyaev-Zeldovich effect. These clusters comprise a nearly mass-limited sample, which is an unprecedented resource for constraining cosmological parameters and for studying galaxy populations in these extreme environments. The weak lensing mass estimates will be used in conjunction with existing data sets {X-ray, infrared, and optical} to establish an accurate overall mass normalization. Uncertainty in the overall mass scale has not been previously determined for this combination of masses and redshifts, and is the dominant uncertainty in extracting constraints on cosmological parameters from cluster abundance studies. We are undertaking a coordinated program of weak lensing measurements, using ground-based telescopes for clusters at redshift z < 0.55, and HST, as requested here, for higher redshifts.;
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