Troxel, MA;
MacCrann, N;
Zuntz, J;
Eifler, TF;
Krause, E;
Dodelson, S;
Gruen, D;
... Zhang, Y; + view all
(2018)
Dark Energy Survey Year 1 results: Cosmological constraints from cosmic shear.
Physical Review D
, 98
(4)
, Article 043528. 10.1103/PhysRevD.98.043528.
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Abstract
We use 26 × 10 6 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 Λ CDM and the w CDM models, while also varying the neutrino mass density. These results are shown to be robust using two independent shape catalogs, two independent photo- z calibration methods, and two independent analysis pipelines in a blind analysis. We find a 3.5% fractional uncertainty on σ 8 ( Ω m / 0.3 ) 0.5 = 0.78 2 + 0.027 − 0.027 at 68% C.L., 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 σ 8 ( Ω m / 0.3 ) 0.5 = 0.77 7 + 0.036 − 0.038 and a dark energy equation-of-state w = − 0.9 5 + 0.33 − 0.39 . We find results that are consistent with previous cosmic shear constraints in σ 8 — Ω m , 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 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.
| Type: | Article |
|---|---|
| Title: | Dark Energy Survey Year 1 results: Cosmological constraints from cosmic shear |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1103/PhysRevD.98.043528 |
| Publisher version: | http://dx.doi.org/10.1103/PhysRevD.98.043528 |
| Language: | English |
| Additional information: | This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Science & Technology, Physical Sciences, Astronomy & Astrophysics, Physics, Particles & Fields, Physics, MATTER POWER SPECTRUM, LARGE-SCALE STRUCTURE, WEAK-LENSING MEASUREMENTS, CHALLENGE LIGHTCONE SIMULATION, SCIENCE VERIFICATION DATA, INTRINSIC ALIGNMENTS, PARAMETER CONSTRAINTS, REDSHIFT DISTRIBUTIONS, GALAXY ELLIPTICITIES, MODEL PREDICTIONS |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery.ucl.ac.uk/id/eprint/1571428 |
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