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

Journal Article · Mon Aug 27 00:00:00 EDT 2018 · Physical Review D

DOI:https://doi.org/10.1103/PhysRevD.98.043528· OSTI ID:1468419

Troxel, M. A.; MacCrann, N.; Zuntz, J.; Eifler, T. F.; Krause, E.; Dodelson, S.; Gruen, D.; Blazek, J.; Friedrich, O.; Samuroff, S.; Prat, J.; Secco, L. F.; Davis, C.; Ferté, A.; DeRose, J.; Alarcon, A.; Amara, A.; Baxter, E.; Becker, M. R.; Bernstein, G. M. ; Bridle, S. L.; Cawthon, R.; Chang, C.; Choi, A.; De Vicente, J.; Drlica-Wagner, A.; Elvin-Poole, J.; Frieman, J.; Gatti, M.; Hartley, W. G.; Honscheid, K.; Hoyle, B.; Huff, E. M.; Huterer, D.; Jain, B.; Jarvis, M.; Kacprzak, T.; Kirk, D.; Kokron, N.; Krawiec, C.; Lahav, O.; Liddle, A. R.; Peacock, J.; Rau, M. M.; Refregier, A.; Rollins, R. P.; Rozo, E.; Rykoff, E. S.; Sánchez, C.; Sevilla-Noarbe, I.; Sheldon, E.; Stebbins, A.; Varga, T. N.; Vielzeuf, P.; Wang, M.; Wechsler, R. H.; Yanny, B.; Abbott, T. M. C.; Abdalla, F. B.; Allam, S.; Annis, J.; Bechtol, K.; Benoit-Lévy, A.; Bertin, E.; Brooks, D.; Buckley-Geer, E.; Burke, D. L.; Carnero Rosell, A.; Carrasco Kind, M.; Carretero, J.; Castander, F. J.; Crocce, M.; Cunha, C. E.; D’Andrea, C. B.; da Costa, L. N.; DePoy, D. L.; Desai, S.; Diehl, H. T.; Dietrich, J. P.; Doel, P.; Fernandez, E.; Flaugher, B.; Fosalba, P.; García-Bellido, J.; Gaztanaga, E.; Gerdes, D. W.; Giannantonio, T.; Goldstein, D. A.; Gruendl, R. A.; Gschwend, J.; Gutierrez, G.; James, D. J.; Jeltema, T.; Johnson, M. W. G.; Johnson, M. D.; Kent, S.; Kuehn, K.; Kuhlmann, S.; Kuropatkin, N.; Li, T. S.; Lima, M.; Lin, H.; Maia, M. A. G.; March, M.; Marshall, J. L.; Martini, P.; Melchior, P.; Menanteau, F.; Miquel, R.; Mohr, J. J.; Neilsen, E.; Nichol, R. C.; Nord, B.; Petravick, D.; Plazas, A. A.; Romer, A. K.; Roodman, A.; Sako, M.; Sanchez, E.; Scarpine, V.; Schindler, R.; Schubnell, M.; Smith, M.; Smith, R. C.; Soares-Santos, M.; Sobreira, F.; Suchyta, E.; Swanson, M. E. C.; Tarle, G.; Thomas, D.; Tucker, D. L.; Vikram, V.; Walker, A. R.; Weller, J.; Zhang, Y.

We use 26×10⁶ 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 ΛCDM and the 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 3.5% fractional uncertainty on σ₈(Ω_m/0.3)^0.5=0.782$$_{-0.027}^{+0.027}$$ at 68% C.L., which is a factor of 2.5 improvement over the fractional constraining power of our DES Science Verification results. In wCDM, we find a 4.8% fractional uncertainty on σ₈(Ω_m/0.3)^0.5=0.777$$_{-0.038}^{+0.036}$$ and a dark energy equation-of-state w=-0.95$$_{-0.39}^{+0.33}$$. We find results that are consistent with previous cosmic shear constraints in σ₈—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 wCDM 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.

• Research Organization: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Univ. of Michigan, Ann Arbor, MI (United States)
• Sponsoring Organization: USDOE Office of Science (SC), High Energy Physics (HEP)
• Contributing Organization: DES Collaboration
• Grant/Contract Number: AC02-07CH11359; SC0007859; SC0012704; SC0007901; AC02-05CH11231; PF5-160138
• OSTI ID: 1468419
• Alternate ID(s): OSTI ID: 1392234; OSTI ID: 1466860; OSTI ID: 1487087; OSTI ID: 1646568
• Report Number(s): arXiv:1708.01538; FERMILAB-PUB-17-279-PPD; BNL-114247-2017-JA; PRVDAQ; 1614461
• Journal Information: Physical Review D, Vol. 98, Issue 4; ISSN 2470-0010
• Publisher: American Physical Society (APS)
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
Astrophysical studies of gravity
Cosmological constant
Cosmological parameters
Evolution of the Universe
Gravitation
Gravitational lenses
Large scale structure of the Universe
Sky surveys
gravitational lensing: weak
dark matter
dark energy
methods: data analysis
cosmology: observations
cosmological parameters