Dark Energy Survey Year 3 results: Cosmology from cosmic shear and robustness to data calibration

Journal Article · 12 January 2022 · Physical Review. D.

DOI: https://doi.org/10.1103/physrevd.105.023514 · OSTI ID:1862308

Amon, A. ^[1]; Gruen, D.; Troxel, M.  A.; MacCrann, N.; Dodelson, S.; Choi, A.; Doux, C.; Secco, L.  F.; Samuroff, S.; Krause, E.; Cordero, J.; Myles, J.; DeRose, J.; Wechsler, R.  H.; Gatti, M.; Navarro-Alsina, A.; Bernstein, G.  M.; Jain, B.; Blazek, J.; Alarcon, A. ; Ferté, A.; Lemos, P.; Raveri, M.; Campos, A.; Prat, J.; Sánchez, C.; Jarvis, M.; Alves, O.; Andrade-Oliveira, F.; Baxter, E.; Bechtol, K.; Becker, M.  R.; Bridle, S.  L.; Camacho, H.; Carnero Rosell, A.; Carrasco Kind, M.; Cawthon, R.; Chang, C.; Chen, R.; Chintalapati, P.; Crocce, M.; Davis, C.; Diehl, H.  T.; Drlica-Wagner, A.; Eckert, K.; Eifler, T.  F.; Elvin-Poole, J.; Everett, S.; Fang, X.; Fosalba, P.; Friedrich, O.; Gaztanaga, E.; Giannini, G.; Gruendl, R.  A.; Harrison, I.; Hartley, W.  G.; Herner, K.; Huang, H.; Huff, E.  M.; Huterer, D.; Kuropatkin, N.; Leget, P.; Liddle, A.  R.; McCullough, J.; Muir, J.; Pandey, S.; Park, Y.; Porredon, A.; Refregier, A.; Rollins, R.  P.; Roodman, A.; Rosenfeld, R.; Ross, A.  J.; Rykoff, E.  S.; Sanchez, J.; Sevilla-Noarbe, I.; Sheldon, E.; Shin, T.; Troja, A.; Tutusaus, I.; Tutusaus, I.; Varga, T.  N.; Weaverdyck, N.; Yanny, B.; Yin, B.; Zhang, Y.; Zuntz, J.; Aguena, M.; Allam, S.; Annis, J.; Bacon, D.; Bertin, E.; Bhargava, S.; Brooks, D.; Buckley-Geer, E.; Burke, D.  L.; Carretero, J.; Costanzi, M.; da Costa, L.  N.; Pereira, M.  E. S.; De Vicente, J.; Desai, S.; Dietrich, J.  P.; Doel, P.; Ferrero, I.; Flaugher, B.; Frieman, J.; García-Bellido, J.; Gaztanaga, E.; Gerdes, D.  W.; Giannantonio, T.; Gschwend, J.; Gutierrez, G.; Hinton, S.  R.; Hollowood, D.  L.; Honscheid, K.; Hoyle, B.; James, D.  J.; Kron, R.; Kuehn, K.; Lahav, O.; Lima, M.; Lin, H.; Maia, M.  A. G.; Marshall, J.  L.; Martini, P.; Melchior, P.; Menanteau, F.; Miquel, R.; Mohr, J.  J.; Morgan, R.; Ogando, R.  L. C.; Palmese, A.; Paz-Chinchón, F.; Petravick, D.; Pieres, A.; Romer, A.  K.; Sanchez, E.; Scarpine, V.; Schubnell, M.; Serrano, S.; Smith, M.; Soares-Santos, M.; Tarle, G.; Thomas, D.; To, C.; Weller, J.

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1. Stanford Univ., CA (United States); DES Collaboration. et al.

This work, together with its companion paper, Secco, Samuroff et al., presents the Dark Energy Survey Year 3 cosmic shear measurements and cosmological constraints based on an analysis of over 100 million source galaxies. With the data spanning 4143 deg² on the sky, divided into four redshift bins, we produce the highest significance measurement of cosmic shear to date, with a signal-to-noise of 40. We conduct a blind analysis in the context of the ΛCDM model and find a 3% constraint of the clustering amplitude, S₈ ≡ σ₈ (Ω_m/0.3) ^0.5 = 0.759$$^{+0.025}_{-0.023}$$. A ΛCDM-Optimized analysis, which safely includes smaller scale information, yields a 2% precision measurement of S₈ = 0.772$$^{+0.018}_{-0.017}$$ that is consistent with the fiducial case. The two low-redshift measurements are statistically consistent with the Planck Cosmic Microwave Background result, however, both recovered S₈ values are lower than the high-redshift prediction by 2.3σ and 2.1σ (ρ-values of 0.02 and 0.05), respectively. The measurements are shown to be internally consistent across redshift bins, angular scales and correlation functions. The analysis is demonstrated to be robust to calibration systematics, with the S₈ posterior consistent when varying the choice of redshift calibration sample, the modeling of redshift uncertainty and methodology. Similarly, we find that the corrections included to account for the blending of galaxies shifts our best-fit S₈ by 0.5σ without incurring a substantial increase in uncertainty. We examine the limiting factors for the precision of the cosmological constraints and find observational systematics to be subdominant to the modeling of astrophysics. Specifically, we identify the uncertainties in modeling baryonic effects and intrinsic alignments as the limiting systematics.

• Research Organization: Argonne National Laboratory (ANL), Argonne, IL (United States); Carnegie Mellon University, Pittsburgh, PA (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); University of Michigan, Ann Arbor, MI (United States)
• Sponsoring Organization: National Science Foundation (NSF); USDOE Office of Science (SC), High Energy Physics (HEP); United Kingdom Science and Technology Facilities Council
• Contributing Organization: DES Collaboration
• Grant/Contract Number: AC02-06CH11357; AC02-07CH11359; AC02-76SF00515; SC0010118; SC0019193
• OSTI ID: 1862308
• Journal Information: Physical Review. D., Journal Name: Physical Review. D. Journal Issue: 2 Vol. 105; ISSN 2470-0010
• Publisher: American Physical Society (APS)Copyright Statement
• Country of Publication: United States
• Language: English