Presentation Abstract

Presentation Number 440.04
Presentation Time: Thursday, Jan 12, 2012, 9:00 AM - 2:00 PM
Title A Cosmic Shear Measurement from SDSS
Author Block Eric M. Huff1, T. Eifler2, C. M. Hirata3, R. Mandelbaum4, D. Schlegel5, U. Seljak6
1UC Berkeley, 2Center for Cosmology and AstroParticle Physics, The Ohio State University, 3Caltech, 4Department of Astrophysical Sciences, Princeton University, 5Lawrence Berkeley National Laboratory, 6Department of Astronomy, Department of Physics, UC Berkeley.
Abstract Weak lensing by large-scale structure is an invaluable cosmological tool in the era where most of the energy density of the concordance cosmology is invisible. Several large ground-based imaging surveys will attempt to measure this effect over the coming decade, but reliable control of the major systematic effects arising from atmospheric turbulence and telescope optics, shear miscalibration, intrinsic galaxy alignments, and photometric redshift inference remains a challenging problem.
We present a cosmic shear measurement using Sloan Digital Sky Survey imaging that addresses each of these challenges. We describe our procedure for lensing-optimized image coaddition, the results of careful modeling of each of the systematic errors, and the constraints our analysis puts on the concordance cosmology.