Dark Energy Survey Year 3 results: redshift calibration of the MAGLIM lens sample from the combination of SOMPZ and clustering and its impact on cosmology

Giannini, G.; Alarcon, A.; Gatti, M.; Porredon, A.; Crocce, M.; Bernstein, G. M.; Cawthon, R.; Sánchez, C.; Doux, C.; Elvin-Poole, J.; Raveri, M.; Myles, J.; Lin, H.; Amon, A.; Allam, S.; Alves, O.; Andrade-Oliveira, F.; Baxter, E.; Bechtol, K.; Becker, M. R.; Blazek, J.; Camacho, H.; Campos, A.; Carnero Rosell, A.; Carrasco Kind, M.; Choi, A.; Cordero, J.; De Vicente, J.; DeRose, J.; Diehl, H. T.; Dodelson, S.; Drlica-Wagner, A.; Eckert, K.; Fang, X.; Farahi, A.; Fosalba, P.; Friedrich, O.; Gruen, D.; Gruendl, R. A.; Gschwend, J.; Harrison, I.; Hartley, W. G.; Huff, E. M.; Jarvis, M.; Krause, E.; Kuropatkin, N.; Lemos, P.; MacCrann, N.; McCullough, J.; Muir, J.; Pandey, S.; Prat, J.; Rodriguez-Monroy, M.; Ross, A. J.; Rykoff, E. S.; Samuroff, S.; Secco, L. F.; Sevilla-Noarbe, I.; Sheldon, E.; Troxel, M. A.; Tucker, D. L.; Weaverdyck, N.; Yanny, B.; Yin, B.; Zhang, Y.; Abbott, T. M. C.; Aguena, M.; Bacon, D.; Bertin, E.; Bocquet, S.; Brooks, D.; Burke, D. L.; Carretero, J.; Castander, F. J.; Costanzi, M.; da Costa, L. N.; Pereira, M. E. S.; Desai, S.; Doel, P.; Ferrero, I.; Flaugher, B.; Friedel, D.; Frieman, J.; García-Bellido, J.; Gerdes, D. W.; Gutierrez, G.; Hinton, S. R.; Hollowood, D. L.; Honscheid, K.; James, D. J.; Kent, S.; Kuehn, K.; Lahav, O.; Lidman, C.; Lima, M.; Melchior, P.; Mena-Fernández, J.; Menanteau, F.; Miquel, R.; Ogando, R. L. C. et al.
Referencia bibliográfica

Monthly Notices of the Royal Astronomical Society

Fecha de publicación:
1
2024
Número de autores
115
Número de autores del IAC
2
Número de citas
13
Número de citas referidas
6
Descripción
We present an alternative calibration of the MAGLIM lens sample redshift distributions from the Dark Energy Survey (DES) first 3 yr of data (Y3). The new calibration is based on a combination of a self-organizing-map-based scheme and clustering redshifts to estimate redshift distributions and inherent uncertainties, which is expected to be more accurate than the original DES Y3 redshift calibration of the lens sample. We describe in detail the methodology, and validate it on simulations and discuss the main effects dominating our error budget. The new calibration is in fair agreement with the fiducial DES Y3 n(z) calibration, with only mild differences (<3σ) in the means and widths of the distributions. We study the impact of this new calibration on cosmological constraints, analysing DES Y3 galaxy clustering and galaxy-galaxy lensing measurements, assuming a Lambda cold dark matter cosmology. We obtain Ωm = 0.30 ± 0.04, σ8 = 0.81 ± 0.07, and S8 = 0.81 ± 0.04, which implies a ~0.4σ shift in the Ω - S8 plane compared to the fiducial DES Y3 results, highlighting the importance of the redshift calibration of the lens sample in multiprobe cosmological analyses.