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

By M. Troxel, N. MacCrann, Joe Zuntz, T. Eifler, E. Krause, Scott Dodelson, Daniel Gruen, J. Blazek, O. Friedrich, S. Samuroff and 125 more. Physical Review D, 2017

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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 Λ 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 σ 8 (Ω 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 σ 8 (Ω 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 σ 8 -- Ω 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.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/81daa147061e3cbd9040271892fa87e3dd2526ae

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Citations in the corpus

The fourth data release of the Kilo-Degree Survey: ugri imaging and nine-band optical-IR photometry over 1000 square degrees (2019, background): “Though designed for the primary cosmology science case (KiDS450; Joudaki et al. 2017; van Uitert et al. 2018; Köhlinger et al. 2017; Harnois-Déraps et al. 2017; Amon et al. 2018; Shan et al. 2018; Martinet et al. 2018; Giblin et al. 2018; Asgari et al. 2019), KiDS data are also being used for a vari”
Cosmological constraints from cosmic shear two-point correlation functions with HSC survey first-year data (2019, methodology): “Also, different studies adopt different modeling choices, for example, Dark Energy Survey Year 1 (DES-Y1; Troxel et al. 2018) adopts the uniform sampling of AS, instead of the logarithmic sampling that adopted in KiDS+VIKING450 (Hildebrandt et al. 2020) and this study.”
Dark Energy Survey Year 1 results: weak lensing mass calibration of redMaPPer galaxy clusters (2018, methodology): “For the cosmology analyses of the lensing two-point functions (Dark Energy Survey Collaboration 2016; Troxel et al. 2018), this calibration was performed in two independent ways, and with consistent results: by the redshift distributions of samples of galaxies with high-quality 30-band photo-zs…”
New physics in light of the H0 tension: An alternative view (2019, background): “[13] DES collaboration, M.”
KiDS+VIKING-450 and DES-Y1 combined: Cosmology with cosmic shear (2019, background): “5% for all current surveys (Hildebrandt et al. 2020, hereafter H20; Troxel et al. 2018, hereafter T18; Hikage et al. 2019; Joudaki et al. 2017; Jee et al. 2016).”
Implications of an extended dark energy cosmology with massive neutrinos for cosmological tensions (2018, methodology): “The different behavior is mostly driven by the fact that fits to JLA data are 9 Model ΛCDM ExDE + ∑ mν = 0.06 ExDE + ∑ mν free Prior on ΩExDE − Full Positive Full Positive Planck lite 217.35 214.20 215.98 209.20 212.66 τ SIMlow 0.24 0.06 0.06 0.11 0.01 Planck lensing 11.25 10.03 10.06 8.86 10.71 SH0”
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