Mathematics – Logic
Scientific paper
Jul 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000hst..prop.8562s&link_type=abstract
HST Proposal ID #8562
Mathematics
Logic
Hst Proposal Id #8562 Cosmology
Scientific paper
The distortion of light bundles from distant galaxies probes the statistical properties of the intervening inhomogeneous {dark} matter distribution. Its tidal gravitational field distorts the observable image shapes thereby causing a coherent ellipticity pattern {Cosmic Shear}. The statistical properties of this pattern reflect those of the large-scale matter distribution in the Universe. Cosmic Shear can therefore probe the LSS without any reference to the relation between dark and luminous matter. Owing to the small magnitude of this effect, a reliable measurement of Cosmic Shear requires superb imaging of very faint objects. From our detailed and successful preliminary work on existing parallel imaging data with STIS, we have demonstrated that STIS provides the required image quality for this program due to its good pixel sampling and its small PSF anisotropy. We propose an imaging Parallel Program for Cycle 9, similar to that carried out in Cycle7. We propose to dedicate one and two orbit parallel opportunities to imaging with the 50CCD `Clear' filter. By combining the results from these two programs, we expect to measure the Cosmic Shear on the STIS angular scale with high precision. Comparison with light tracing through very large N-body simulations will allow us to constrain the cosmological parameters and fix the normalization of the dark matter power spectrum with high accuracy.
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