10-1103-PhysRevD-94-022002.pdf (1.79 MB)
Cosmic shear measurements with Dark Energy Survey science verification data
Version 2 2023-06-12, 08:35
Version 1 2023-06-09, 04:13
journal contribution
posted on 2023-06-12, 08:35 authored by Kathy RomerKathy Romer, M R Becker, M A Troxel, N MacCrann, E Krause, T F Eifler, O Friedrich, A Nicola, A Refregier, The Dark Energy CollaborationWe present measurements of weak gravitational lensing cosmic shear two-point statistics using Dark Energy Survey Science Verification data. We demonstrate that our results are robust to the choice of shear measurement pipeline, either ngmix or im3shape, and robust to the choice of two-point statistic, including both real and Fourier-space statistics. Our results pass a suite of null tests including tests for B-mode contamination and direct tests for any dependence of the two-point functions on a set of 16 observing conditions and galaxy properties, such as seeing, airmass, galaxy color, galaxy magnitude, etc. We furthermore use a large suite of simulations to compute the covariance matrix of the cosmic shear measurements and assign statistical significance to our null tests. We find that our covariance matrix is consistent with the halo model prediction, indicating that it has the appropriate level of halo sample variance. We compare the same jackknife procedure applied to the data and the simulations in order to search for additional sources of noise not captured by the simulations. We find no statistically significant extra sources of noise in the data. The overall detection significance with tomography for our highest source density catalog is 9.7 sigma . Cosmological constraints from the measurements in this work are presented in a companion paper [DES et al., Phys. Rev. D 94, 022001 (2016).].
Funding
STFC Consolidated Grant Supplement; G1316; STFC-SCIENCE AND TECHNOLOGY FACILITIES COUNCIL; ST/M000753/1
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- Published
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Physical Review DISSN
1550-7998Publisher
American Physical SocietyExternal DOI
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94Page range
042005Department affiliated with
- Physics and Astronomy Publications
Research groups affiliated with
- Astronomy Centre Publications
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- Yes
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- Yes
Legacy Posted Date
2016-11-28First Open Access (FOA) Date
2016-12-05First Compliant Deposit (FCD) Date
2016-11-25Usage metrics
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