Dark Energy Survey year 1 results: Cosmological constraints from galaxy clustering and weak lensing

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

DOI:https://doi.org/10.1103/PhysRevD.98.043526· OSTI ID:1475139

Abbott, T. M. C.; Abdalla, F. B.; Alarcon, A.; Aleksić, J.; Allam, S.; Allen, S.; Amara, A.; Annis, J.; Asorey, J.; Avila, S.; Bacon, D.; Balbinot, E.; Banerji, M.; Banik, N.; Barkhouse, W.; Baumer, M.; Baxter, E.; Bechtol, K.; Becker, M. R.; Benoit-Lévy, A. ; Benson, B. A.; Bernstein, G. M.; Bertin, E.; Blazek, J.; Bridle, S. L.; Brooks, D.; Brout, D.; Buckley-Geer, E.; Burke, D. L.; Busha, M. T.; Campos, A.; Capozzi, D.; Carnero Rosell, A.; Carrasco Kind, M.; Carretero, J.; Castander, F. J.; Cawthon, R.; Chang, C.; Chen, N.; Childress, M.; Choi, A.; Conselice, C.; Crittenden, R.; Crocce, M.; Cunha, C. E.; D’Andrea, C. B.; da Costa, L. N.; Das, R.; Davis, T. M.; Davis, C.; De Vicente, J.; DePoy, D. L.; DeRose, J.; Desai, S.; Diehl, H. T.; Dietrich, J. P.; Dodelson, S.; Doel, P.; Drlica-Wagner, A.; Eifler, T. F.; Elliott, A. E.; Elsner, F.; Elvin-Poole, J.; Estrada, J.; Evrard, A. E.; Fang, Y.; Fernandez, E.; Ferté, A.; Finley, D. A.; Flaugher, B.; Fosalba, P.; Friedrich, O.; Frieman, J.; García-Bellido, J.; Garcia-Fernandez, M.; Gatti, M.; Gaztanaga, E.; Gerdes, D. W.; Giannantonio, T.; Gill, M. S. S.; Glazebrook, K.; Goldstein, D. A.; Gruen, D.; Gruendl, R. A.; Gschwend, J.; Gutierrez, G.; Hamilton, S.; Hartley, W. G.; Hinton, S. R.; Honscheid, K.; Hoyle, B.; Huterer, D.; Jain, B.; James, D. J.; Jarvis, M.; Jeltema, T.; Johnson, M. D.; Johnson, M. W. G.; Kacprzak, T.; Kent, S.; Kim, A. G.; King, A.; Kirk, D.; Kokron, N.; Kovacs, A.; Krause, E.; Krawiec, C.; Kremin, A.; Kuehn, K.; Kuhlmann, S.; Kuropatkin, N.; Lacasa, F.; Lahav, O.; Li, T. S.; Liddle, A. R.; Lidman, C.; Lima, M.; Lin, H.; MacCrann, N.; Maia, M. A. G.; Makler, M.; Manera, M.; March, M.; Marshall, J. L.; Martini, P.; McMahon, R. G.; Melchior, P.; Menanteau, F.; Miquel, R.; Miranda, V.; Mudd, D.; Muir, J.; Möller, A.; Neilsen, E.; Nichol, R. C.; Nord, B.; Nugent, P.; Ogando, R. L. C.; Palmese, A.; Peacock, J.; Peiris, H. V.; Peoples, J.; Percival, W. J.; Petravick, D.; Plazas, A. A.; Porredon, A.; Prat, J.; Pujol, A.; Rau, M. M.; Refregier, A.; Ricker, P. M.; Roe, N.; Rollins, R. P.; Romer, A. K.; Roodman, A.; Rosenfeld, R.; Ross, A. J.; Rozo, E.; Rykoff, E. S.; Sako, M.; Salvador, A. I.; Samuroff, S.; Sánchez, C.; Sanchez, E.; Santiago, B.; Scarpine, V.; Schindler, R.; Scolnic, D.; Secco, L. F.; Serrano, S.; Sevilla-Noarbe, I.; Sheldon, E.; Smith, R. C.; Smith, M.; Smith, J.; Soares-Santos, M.; Sobreira, F.; Suchyta, E.; Tarle, G.; Thomas, D.; Troxel, M. A.; Tucker, D. L.; Tucker, B. E.; Uddin, S. A.; Varga, T. N.; Vielzeuf, P.; Vikram, V.; Vivas, A. K.; Walker, A. R.; Wang, M.; Wechsler, R. H.; Weller, J.; Wester, W.; Wolf, R. C.; Yanny, B.; Yuan, F.; Zenteno, A.; Zhang, B.; Zhang, Y.; Zuntz, J.

Here, we present cosmological results from a combined analysis of galaxy clustering and weak gravitational lensing, using 1321 deg² of griz imaging data from the first year of the Dark Energy Survey (DES Y1). We combine three two-point functions: (i) the cosmic shear correlation function of 26 million source galaxies in four redshift bins, (ii) the galaxy angular autocorrelation function of 650,000 luminous red galaxies in five redshift bins, and (iii) the galaxy-shear cross-correlation of luminous red galaxy positions and source galaxy shears. To demonstrate the robustness of these results, we use independent pairs of galaxy shape, photometric-redshift estimation and validation, and likelihood analysis pipelines. To prevent confirmation bias, the bulk of the analysis was carried out while “blind” to the true results; we describe an extensive suite of systematics checks performed and passed during this blinded phase. The data are modeled in flat Λ CDM and $$w$$ CDM cosmologies, marginalizing over 20 nuisance parameters, varying 6 (for Λ CDM ) or 7 (for $$w$$ CDM ) cosmological parameters including the neutrino mass density and including the 457 × 457 element analytic covariance matrix. We find consistent cosmological results from these three two-point functions and from their combination obtain S₈ ≡ σ₈ (Ω_m/0.3 )^0.5 = 0.773 $$+0.026 \atop{- 0.020}$$ and Ω_m = 0.267 $$+ 0.030\atop{- 0.017}$$ for Λ CDM ; for $$w$$ CDM, we find S₈ = 0.782 $$+ 0.036\atop{- 0.024}$$, Ω_m = 0.284$$+ 0.033\atop{- 0.030}$$ , and $$w$$ = - 0.8 2 $$+0.21\atop{- 0.20}$$ at 68% C.L. The precision of these DES Y1 constraints rivals that from the Planck cosmic microwave background measurements, allowing a comparison of structure in the very early and late Universe on equal terms. Although the DES Y1 best-fit values for S₈ and Ω_m are lower than the central values from Planck for both Λ CDM and $$w$$ CDM, the Bayes factor indicates that the DES Y1 and Planck data sets are consistent with each other in the context of Λ CDM . Combining DES Y1 with Planck, baryonic acoustic oscillation measurements from SDSS, 6dF, and BOSS and type Ia supernovae from the Joint Lightcurve Analysis data set, we derive very tight constraints on cosmological parameters: S₈ = 0.802 ± 0.012 and Ω_m = 0.298 ± 0.007 in Λ CDM and $$w$$ = - 1.00$$+0.05\atop{- 0.04}$$ in $$w$$ CDM. Upcoming Dark Energy Survey analyses will provide more stringent tests of the Λ CDM model and extensions such as a time-varying equation of state of dark energy or modified gravity.

• Research Organization: Brookhaven National Laboratory (BNL), Upton, NY (United States); Univ. of Michigan, Ann Arbor, MI (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC), High Energy Physics (HEP)
• Contributing Organization: Dark Energy Survey Collaboration; DES; Dark Energy Survey Collaboration 1
• Grant/Contract Number: SC0012704; SC0007859; AC02-07CH11359; AC02-05CH11231; AC02-76SF00515; AST-1138766; AST-1536171
• OSTI ID: 1475139
• Alternate ID(s): OSTI ID: 1375908; OSTI ID: 1466876; OSTI ID: 1475432; OSTI ID: 1477364; OSTI ID: 1646569
• Report Number(s): BNL-209106-2018-JAAM; arXiv:1708.01530; FERMILAB-PUB-17-294-PPD; PRVDAQ
• 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
Dark energy
Evolution of the Universe