The DECADE cosmic shear project IV: cosmological constraints from 107 million galaxies across 5,400 deg 2 of the sky
Year: 2025
Type: article
Abstract: We present cosmological constraints from the Dark Energy Camera All Data Everywhere (DECADE) cosmic shear analysis. This work uses shape measurements for 107 million galaxies measured through Dark Energy Camera (DECam) imaging of 5 , 412 deg 2 of sky that is outside the Dark Energy Survey (DES) footprint. We derive constraints on the cosmological parameters S 8 = 0.791 − 0.032 + 0.027 and for the Λ CDM model, which are consistent with those from other weak lensing surveys and from the cosmic microwave background. We combine our results with cosmic shear results from DES Y3 at the likelihood level, since the two datasets span independent areas on the sky. The combined measurements, which cover ≈ 10 , 000 deg 2 , prefer S 8 = 0.791 ± 0.023 and under the Λ CDM model. These results are the culmination of a series of rigorous studies that characterize and validate the DECADE dataset and the associated analysis methodologies (Anbajagane et. al 2025a,b,c). Overall, the DECADE project demonstrates that the cosmic shear analysis methods employed in Stage-III weak lensing surveys can provide robust cosmological constraints for fairly inhomogeneous datasets. This opens the possibility of using data that have been previously categorized as ``unusable’’ for cosmic shear analyses, thereby increasing the statistical power of upcoming weak lensing surveys.
Source: The Open Journal of Astrophysics
DOI: 10.33232/001c.146161
Authors: D. Anbajagane, C. Chang, A. Drlica-Wagner, C. Y. Tan, M. Adamow, R. A. Gruendl, L. F. Secco, Z. Zhang, M. R. Becker, P. S. Ferguson, N. Chicoine, K. Herron, A. Alarcon, R. Teixeira, D. Suson, A. N. Alsina, A. Amon, F. Andrade-Oliveira, J. Blazek, C. R. Bom, H. Camacho, J. A. Carballo-Bello, A. Carnero Rosell, R. Cawthon, W. Cerny, A. Choi, Y. Choi, S. Dodelson, C. Doux, K. Eckert, J. Elvin-Poole, J. Esteves, M. Gatti, G. Giannini, W. G. Hartley, D. Gruen, K. Herner, E. M. Huff, D. J. James, M. Jarvis, E. Krause, N. Kuropatkin, C. E. Martínez-Vázquez, P. Massana, S. Mau, J. McCullough, G. E. Medina, B. Mutlu-Pakdil, J. Myles, M. Navabi, N. E. D. Noël, A. B. Pace, A. Porredon, J. Prat, M. Raveri, A. H. Riley, E. S. Rykoff, J. D. Sakowska, S. Samuroff, D. Sanchez-Cid, D. J. Sand, L. Santana-Silva, I. Sevilla-Noarbe, T. Shin, M. Soares-Santos, G. S. Stringfellow, C. To, A. Tong, M. A. Troxel, A. K. Vivas, M. Yamamoto, B. Yanny, B. Yin, Y. Zhang, J. Zuntz
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: diamond
Funders: National Science Foundation, U.S. Department of Energy, National Aeronautics and Space Administration, University of Pennsylvania, Ohio State University, University of Chicago, University of Portsmouth, Centres de Recerca de Catalunya, University College London, European Commission, University of Sussex, Deutsche Forschungsgemeinschaft, Generalitat de Catalunya, Conselho Nacional de Desenvolvimento Científico e Tecnológico, Financiadora de Estudos e Projetos, Ministerio de Ciencia e Innovación, Institut de Física d'Altes Energies, University of Illinois at Urbana-Champaign, Science and Technology Facilities Council, European Regional Development Fund, Laboratory Directed Research and Development, Integrated Electronics Engineering Center, Binghamton University, Argonne National Laboratory, Fermilab, Lawrence Berkeley National Laboratory, SLAC National Accelerator Laboratory
Awards: G1054097061, G1249197737, G1255325603, G1491530973, Collaborative Research: Cosmic Shear on Extremely Large Scales with the Dark Energy Camera, G1679284459, G1682672702, Collaborative Research: Jump Starting LSST Proper Motion Science with 12 Years of DECam Observations, Collaborative Research: Cosmic Shear on Extremely Large Scales with the Dark Energy Camera, G2037078528, G2290189609, G2636502879, G2916908045, G3261693824, G3522231704, G3586607516, G3740091667, G3803561910, The Dark Energy Survey Data Management Operations, G3870743921, G3968781304, G419118642, G4334057779, G4478587286, G454676879, G490073602, G4944594896, G4960654128, G5601225551, G5617605617, G5955501538, Collaborative Research: Jump Starting LSST Proper Motion Science with 12 Years of DECam Observations, G6514847661, G6619390584, G6636566961, G6731467812, G7038324121, Graduate Research Fellowship Program (GRFP), G7711421660, G7731791180, G7788408655, G7835623888, G7915813472, Collaborative Research: Jump Starting LSST Proper Motion Science with 12 Years of DECam Observations, Collaborative Research: The Dark Energy Survey Data Management Operations, Studying the Threshold of Galaxy Formation with Ultra-Faint Galaxies
OpenAlex ID: W4415439364