Cosmic shear measurements with Dark Energy Survey Science Verification data Article Swipe
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· 2016
· Open Access
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· DOI: https://doi.org/10.1103/physrevd.94.022002
· OA: W1465587517
We present measurements of weak gravitational lensing cosmic shear two-point\nstatistics using Dark Energy Survey Science Verification data. We demonstrate\nthat our results are robust to the choice of shear measurement pipeline, either\nngmix or im3shape, and robust to the choice of two-point statistic, including\nboth real and Fourier-space statistics. Our results pass a suite of null tests\nincluding tests for B-mode contamination and direct tests for any dependence of\nthe two-point functions on a set of 16 observing conditions and galaxy\nproperties, such as seeing, airmass, galaxy color, galaxy magnitude, etc. We\nfurthermore use a large suite of simulations to compute the covariance matrix\nof the cosmic shear measurements and assign statistical significance to our\nnull tests. We find that our covariance matrix is consistent with the halo\nmodel prediction, indicating that it has the appropriate level of halo sample\nvariance. We compare the same jackknife procedure applied to the data and the\nsimulations in order to search for additional sources of noise not captured by\nthe simulations. We find no statistically significant extra sources of noise in\nthe data. The overall detection significance with tomography for our highest\nsource density catalog is 9.7sigma. Cosmological constraints from the\nmeasurements in this work are presented in a companion paper (DES et al. 2015).\n
