Dark Energy Survey Year 3: Blue shear

McCullough, J.; Amon, A.; Legnani, E.; Gruen, D.; Roodman, A.; Friedrich, O.; MacCrann, N.; Becker, M.; Myles, J.; Dodelson, S.; Samuroff, S.; Blazek, J.; Prat, J.; Pieres, A.; Ferté, A.; Alarcon, A.; Drlica-Wagner, A.; Choi, A.; Navarro-Alsina, A.; Campos, A.; Plazas Malagón, A. A.; Porredon, A.; Ross, A. J.; Carnero Rosell, A.; Yin, B.; Flaugher, B.; Yanny, B.; Sánchez, C.; Chang, C.; Davis, C.; To, C.; Doux, C.; Brooks, D.; James, D. J.; Sanchez Cid, D.; Hollowood, D. L.; Huterer, D.; Rykoff, E. S.; Gaztanaga, E.; Huff, E. M.; Suchyta, E.; Sheldon, E.; Sanchez, E.; Tarsitano, F.; Andrade-Oliveira, F.; Castander, F. J.; Bernstein, G. M.; Gutierrez, G.; Giannini, G.; Tarle, G.; Diehl, H. T.; Huang, H.; Harrison, I.; Sevilla-Noarbe, I.; Tutusaus, I.; Ferrero, I.; Elvin-Poole, J.; Marshall, J. L.; Muir, J.; Weller, J.; Zuntz, J.; Carretero, J.; DeRose, J.; Frieman, J.; Cordero, J.; De Vicente, J.; García-Bellido, J.; Mena-Fernández, J.; Eckert, K.; Romer, A. K.; Bechtol, K.; Herner, K.; Honscheid, K.; Kuehn, K.; Secco, L. F.; da Costa, L. N.; Paterno, M.; Soares-Santos, M.; Gatti, M.; Raveri, M.; Yamamoto, M.; Smith, M.; Carrasco Kind, M.; Troxel, M. A.; Jarvis, M.; Swanson, M. E. C.; Weaverdyck, N.; Lahav, O.; Doel, P.; Wiseman, P.; Miquel, R.; Gruendl, R. A.; Cawthon, R.; Allam, S.; Hinton, S. R.; Bridle, S. L.; Bocquet, S.; Desai, S.; Pandey, S.; Everett, S. et al.
Bibliographical reference

Physical Review D

Advertised on:
5
2026
Number of authors
118
IAC number of authors
1
Citations
38
Refereed citations
0
Description
Modeling the intrinsic alignment (IA) of galaxies poses a challenge to weak lensing analyses. Using the Dark Energy Survey Year 3 shape catalog, we expect less impact from IA when we limit the sample 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 Ωm and S8 better agree with the observations from Planck on the cosmic microwave background. Mitigating IA with sample selection in DES, rather than flexible model choices, can reduce uncertainty in S8 by a factor of 1.5.