Dark Energy Survey Year 3: Blue shear

Physical review. D/Physical review. D. 2026 Open access

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Authors: J. McCullough, A. Amon, Elisa Legnani, D Gruen, A Roodman, O Friedrich, N. MacCrann, M. R. Becker, J. Myles, Scott Dodelson, S Samuroff, J Blazek
+88 more J Prat, A Pieres, A. Ferté, A. Alarcon, A Drlica-Wagner, A Choi, A Navarro-Alsina, A. Campos, A. A. Plazas Malagón, A. Porredon, Ashley J. Ross, A. Carnero Rosell, B Yin, B Flaugher, B. Yanny, C. Sánchez, C. Chang, Christopher Davis, C. To, C. Doux, David J. Brooks, D. J. James, D Sanchez Cid, D.L Hollowood, Dragan Huterer, E. S. Rykoff, E Gaztanaga, Eric Huff, E. Suchyta, E. Sheldon, E. Sánchez, F. Tarsitano, F. Andrade-Oliveira, F. J. Castander, G. M. Bernstein, G Gutierrez, G Giannini, G. Tarlé, H. T. Diehl, Hung-Jin Huang, I Harrison, I. Sevilla-Noarbe, I. Tutusaus, I. Ferrero, J Elvin-Poole, J. L. Marshall, J. Muir, J Weller, J Zuntz, J. Carretero, Joseph DeRose, J. Frieman, J. Cordero, J. De Vicente, J. García-Bellido, J. Mena-Fernández, K. Eckert, A. K. Romer, K. Bechtol, K Herner, K. Honscheid, K. Kuehn, L. F. Secco, L. N. da Costa, M. Paterno, M. Soares-Santos, M. Gatti, Marco Raveri, M. Yamamoto, M. Smith, M. Carrasco Kind, M. A. Troxel, Mike Jarvis, M. E. C. Swanson, N. Weaverdyck, O Lahav, P. Doel, P. Wiseman, R Miquel, R. A. Gruendl, R Cawthon, S. Allam, S. R. Hinton, S. L. Bridle, S. Bocquet, S Desai, S Pandey, S Everett
DOI: 10.1103/wmp3-qc3p
Cited by: 11
References: 71

Abstract

Modeling the intrinsic alignment (IA) of galaxies poses a challenge to weak lensing analyses. The Dark Energy Survey is expected to be less impacted by IA when limited to blue, star-forming galaxies. The cosmological parameter constraints from this blue cosmic shear sample are stable to IA model choice, unlike passive galaxies in the full DES Y3 sample, the goodness-of-fit is improved and the $Ω_{m}$ and $S_8$ better agree with the cosmic microwave background. Mitigating IA with sample selection, instead of flexible model choices, can reduce uncertainty in $S_8$ by a factor of 1.5.

Fields of Study & Subjects

Astronomy and Astrophysical Research Stellar planetary and galactic studies CCD and CMOS Imaging Sensors

Publication details

Journal / source
Physical review. D/Physical review. D.
Publisher
American Physical Society (APS)
Volume
113
Issue
10
Publication date
17 February 2026
Language
EN