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PhysRevD.98.043528.pdf (3.09 MB)

Dark Energy Survey Year 1 results: cosmological constraints from cosmic shear

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Version 2 2023-06-12, 07:31
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journal contribution
posted on 2023-06-12, 07:31 authored by M A Troxel, N MacCrann, J Zuntz, E Krause, S Dodelson, D Gruen, J Blazek, O Friedrich, S Samuroff, J Prat, Kathy RomerKathy Romer, The DES Collobration, others
We use 26 million galaxies from the Dark Energy Survey (DES) Year 1 shape catalogs over 1321 deg 2 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 ? CDM and w CDM models, while also varying the neutrino mass density. These results are shown to be robust using two independent shape catalogs, two independent \photoz\ calibration methods, and two independent analysis pipelines in a blind analysis. We find a 3.5\% fractional uncertainty on s 8 (O m /0.3) 0.5 =0.782 +0.027 -0.027 at 68\% CL, which is a factor of 2.5 improvement over the fractional constraining power of our DES Science Verification results. In w CDM, we find a 4.8\% fractional uncertainty on s 8 (O m /0.3) 0.5 =0.777 +0.036 -0.038 and a dark energy equation-of-state w=-0.95 +0.33 -0.39. We find results that are consistent with previous cosmic shear constraints in s 8 -- O m, and see no evidence for disagreement of our weak lensing data with data from the CMB. Finally, we find no evidence preferring a w CDM model allowing w?-1 . 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.

History

Publication status

  • Published

File Version

  • Published version

Journal

Physical Review D

ISSN

2470-0010

Publisher

American Physical Society

Issue

4

Volume

98

Page range

043528 1-33

Department affiliated with

  • Physics and Astronomy Publications

Research groups affiliated with

  • Astronomy Centre Publications

Full text available

  • Yes

Peer reviewed?

  • Yes

Legacy Posted Date

2018-12-14

First Open Access (FOA) Date

2018-12-14

First Compliant Deposit (FCD) Date

2018-12-13

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