Physics
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004bdmh.confe..16s&link_type=abstract
"Proceedings of "Baryons in Dark Matter Halos". Novigrad, Croatia, 5-9 Oct 2004. Editors: R. Dettmar, U. Klein, P. Salucci. Publ
Physics
Scientific paper
In these proceedings we present a cosmic shear analysis of data from the HST/ACS Parallel Cosmic Shear Survey. Due to its relatively large field-of-view in combination with space-based resolution, ACS provides excellent conditions to measure cosmic shear on small and intermediate angular scales. We used 54 deep ACS/WFC images with an average galaxy number density of ˜ 85 per square arcminute for the cosmic shear analysis. We thoroughly investigated the effect of the HST/ACS point spread function (psf) on the shear measurement. To account for the low number of stars present in many fields at high galactic latitudes, we developed a new method for the psf anisotropy correction using a superposition of template patterns. Our preliminary cosmic shear results are consistent with ΛCDM predictions with σ8 = 0.8. We still find indications for a remaining contamination of our data with systematic effects. Once these remaining systematics are properly understood and corrected, it will be possible to measure cosmic shear at small scales with the ACS Parallel Cosmic Shear Survey with unprecedented precision.
Erben Thomas
Miralles Joan-Marc
Schneider Peter
Schrabback Tim
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