skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Dark Energy Survey Year 1 Results: Cosmological Constraints from Cosmic Shear

Abstract

Here, 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 wCDM 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% fractional uncertainty on σ 8( Ω m=0.3)0.5 = 0.789$$+0.024\atop{0.026}$$ at 68% CL, which is a factor of three improvement over the fractional constraining power of our DES Science Verification results and a factor 1.5 tighter than the previous state-of-the-art cosmic shear results. In wCDM, we find a 5% fractional uncertainty on 8( m=0:3)0:5 = 0.789$$+0.036\atop{0.038}$$ and a dark energy equation-of-state w = -0.82$$+0.26\atop{-0.48}$$. Though we find results that are consistent with previous cosmic shear constraints in 8 – m, we nevertheless see no evidence for disagreement of our weak lensing data with data from the CMB. Finally, we find no evidence preferring a wCDM model allowing w≠ -1. Finally, 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.

Authors:
 [1]
  1. The Ohio State Univ., Columbus, OH (United States). Center for Cosmology and Astro-Particle Physics. et al.
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States); Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Contributing Org.:
DES Collaboration
OSTI Identifier:
1468419
Alternate Identifier(s):
OSTI ID: 1392234; OSTI ID: 1466860; OSTI ID: 1487087
Report Number(s):
BNL-114247-2017-JA; arXiv:1708.01538; FERMILAB-PUB-17-279-PPD
Journal ID: ISSN 2470-0010
Grant/Contract Number:  
SC0012704; SC0007901; AC02-07CH11359; AC02-05CH11231; PF5-160138
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review D
Additional Journal Information:
Journal Volume: 98; Journal Issue: 4; Journal ID: ISSN 2470-0010
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; gravitational lensing: weak; dark matter; dark energy; methods: data analysis; cosmology: observations; cosmological parameters

Citation Formats

Troxel, M. A. Dark Energy Survey Year 1 Results: Cosmological Constraints from Cosmic Shear. United States: N. p., 2018. Web. doi:10.1103/PhysRevD.98.043528.
Troxel, M. A. Dark Energy Survey Year 1 Results: Cosmological Constraints from Cosmic Shear. United States. doi:10.1103/PhysRevD.98.043528.
Troxel, M. A. Mon . "Dark Energy Survey Year 1 Results: Cosmological Constraints from Cosmic Shear". United States. doi:10.1103/PhysRevD.98.043528. https://www.osti.gov/servlets/purl/1468419.
@article{osti_1468419,
title = {Dark Energy Survey Year 1 Results: Cosmological Constraints from Cosmic Shear},
author = {Troxel, M. A.},
abstractNote = {Here, we use 26 million galaxies from the Dark Energy Survey (DES) Year 1 shape catalogs over 1321 deg2 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 wCDM 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% fractional uncertainty on σ8( Ωm=0.3)0.5 = 0.789$+0.024\atop{0.026}$ at 68% CL, which is a factor of three improvement over the fractional constraining power of our DES Science Verification results and a factor 1.5 tighter than the previous state-of-the-art cosmic shear results. In wCDM, we find a 5% fractional uncertainty on 8( m=0:3)0:5 = 0.789$+0.036\atop{0.038}$ and a dark energy equation-of-state w = -0.82$+0.26\atop{-0.48}$. Though we find results that are consistent with previous cosmic shear constraints in 8 – m, we nevertheless see no evidence for disagreement of our weak lensing data with data from the CMB. Finally, we find no evidence preferring a wCDM model allowing w≠ -1. Finally, 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.},
doi = {10.1103/PhysRevD.98.043528},
journal = {Physical Review D},
issn = {2470-0010},
number = 4,
volume = 98,
place = {United States},
year = {2018},
month = {8}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Citation Metrics:
Cited by: 53 works
Citation information provided by
Web of Science

Save / Share: