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Cosmology from cosmic shear with Dark Energy Survey Science Verification data [electronic resource].

Published
Washington, D.C. : United States. Dept. of Energy. High Energy Physics Division, 2016.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy
Physical Description
Article numbers 022,001 : digital, PDF file
Additional Creators
Brookhaven National Laboratory, United States. Department of Energy. High Energy Physics Division, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
Here, we present the first constraints on cosmology from the Dark Energy Survey (DES), using weak lensing measurements from the preliminary Science Verification (SV) data. We use 139 square degrees of SV data, which is less than 3% of the full DES survey area. Using cosmic shear 2-point measurements over three redshift bins we find σ8(Ωm/0.3)0.5=0.81±0.06 (68% confidence), after marginalizing over 7 systematics parameters and 3 other cosmological parameters. We examine the robustness of our results to the choice of data vector and systematics assumed, and find them to be stable. About 20% of our error bar comes from marginalizing over shear and photometric redshift calibration uncertainties. The current state-of-the-art cosmic shear measurements from CFHTLenS are mildly discrepant with the cosmological constraints from Planck CMB data; our results are consistent with both data sets. Our uncertainties are ~30% larger than those from CFHTLenS when we carry out a comparable analysis of the two data sets, which we attribute largely to the lower number density of our shear catalogue. We also investigate constraints on dark energy and find that, with this small fraction of the full survey, the DES SV constraints make negligible impact on the Planck constraints. Finally, the moderate disagreement between the CFHTLenS and Planck values of σ8(Ωm/0.3)0.5 is present regardless of the value of w.
Report Numbers
E 1.99:bnl--112621-2016-ja
bnl--112621-2016-ja
Subject(s)
Note
Published through SciTech Connect.
07/06/2016.
"bnl--112621-2016-ja"
"KA2301020"
Physical Review D 94 2 ISSN 2470-0010; PRVDAQ AM
Abbott, T.; Abdalla, F.; Allam, S.; Amara, A.; Annis, J.; Armstrong, R.; Bacon, D.; Banerji, M.; Bauer, A.; Baxter, E.; Becker, M.; Benoit-Lévy, A.; Bernstein, R.; Bernstein, G.; Bertin, E.; Blazek, J.; Bonnett, C.; Bridle, S.; Brooks, D.; Bruderer, C.; Buckley-Geer, E.; Burke, D.; Busha, M.; Capozzi, D.; Carnero Rosell, A.; et al.
Funding Information
SC00112704
AC02-98CH10886
SC0007901
FG02-91ER40690
View MARC record | catkey: 23494694