Abstract
We use galaxies from the Dark Energy Survey (DES) Year 1 shape catalogs over of the sky to produce the most significant measurement of cosmic shear in a galaxy survey to date. We constrain cosmological parameters in both the flat and the models, while also varying the neutrino mass density. These results are shown to be robust using two independent shape catalogs, two independent photo- calibration methods, and two independent analysis pipelines in a blind analysis. We find a 3.5% fractional uncertainty on at 68% C.L., which is a factor of 2.5 improvement over the fractional constraining power of our DES Science Verification results. In , we find a 4.8% fractional uncertainty on and a dark energy equation-of-state . We find results that are consistent with previous cosmic shear constraints in —, and we see no evidence for disagreement of our weak lensing data with data from the cosmic microwave background. Finally, we find no evidence preferring a model allowing . We expect further significant improvements with subsequent years of DES data, which will more than triple the sky coverage of our shape catalogs and double the effective integrated exposure time per galaxy.
12 More- Received 2 August 2017
- Corrected 28 August 2018
DOI:https://doi.org/10.1103/PhysRevD.98.043528
© 2018 American Physical Society
Physics Subject Headings (PhySH)
Corrections
28 August 2018
Correction: The Collaboration abbreviation has been expanded for consistency with companion papers.
Viewpoint
Weak Lensing Becomes a High-Precision Survey Science
Published 27 August 2018
Analyzing its first year of data, the Dark Energy Survey has demonstrated that weak lensing can probe cosmological parameters with a precision comparable to cosmic microwave background observations.
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