Dark Energy Survey Year 3 results: magnification modelling and impact on cosmological constraints from galaxy clustering and galaxy-galaxy lensing

Elvin-Poole, J.; MacCrann, N.; Everett, S.; Prat, J.; Rykoff, E.S.; de Vicente, J.; Yanny, B.; Herner, K.; Ferté, A.; Di, Valentino, E.; Choi, A.; Burke, D.L.; Sevilla-Noarbe, I.; Alarcon, A.; Alves, O.; Amon, A.; Andrade-Oliveira, F.; Baxter, E.; Bechtol, K.; Becker, M.R.; Bernstein, G.M.; Blazek, J.; Camacho, H.; Campos, A.; Carnero, Rosell, A.; Carrasco, Kind, M.; Cawthon, R.; Chang, C.; Chen, R.; Cordero, J.; Crocce, M.; Davis, C.; Derose, J.; Diehl, H.T.; Dodelson, S.; Doux, C.; Drlica-Wagner, A.; Eckert, K.; Eifler, T.F.; Elsner, F.; Fang, X.; Fosalba, P.; Friedrich, O.; Gatti, M.; Giannini, G.; Gruen, D.; Gruendl, R.A.; Harrison, I.; Hartley, W.G.; Huang, H.; Huff, E.M.; Huterer, D.; Krause, E.; Kuropatkin, N.; Leget, P.-F.; Lemos, P.; Liddle, A.R.; McCullough, J.; Muir, J.; Myles, J.; Navarro-Alsina, A.; Pandey, S.; Park, Y.; Porredon, A.; Raveri, M.; Rodriguez-Monroy, M.; Rollins, R.P.; Roodman, A.; Rosenfeld, R.; Ross, A.J.; Sánchez, C.; Sanchez, J.; Secco, L.F.; Sheldon, E.; Shin, T.; Troxel, M.A.; Tutusaus, I.; Varga, T.N.; Weaverdyck, N.; Wechsler, R.H.; Yin, B.; Zhang, Y.; Zuntz, J.; Aguena, M.; Avila, S.; Bacon, D.; Bertin, E.; Bocquet, S.; Brooks, D.; García-Bellido, J.; Honscheid, K.; Jarvis, M.; Li, T.S.; Mena-Fernández, J.; To, C.; Wilkinson, R.D.

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Author

Elvin-Poole, J.
MacCrann, N.
Everett, S.
Prat, J.
Rykoff, E.S.
de Vicente, J.
Yanny, B.
Herner, K.
Ferté, A.
Di, Valentino, E.

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Affiliation

Department of Astronomy, Steward Observatory, University of Arizona
Department of Physics, University of Arizona

Issue Date

2023-06-10

Citation

J Elvin-Poole, N MacCrann, S Everett, J Prat, E S Rykoff, J De Vicente, B Yanny, K Herner, A Ferté, E Di Valentino, A Choi, D L Burke, I Sevilla-Noarbe, A Alarcon, O Alves, A Amon, F Andrade-Oliveira, E Baxter, K Bechtol, M R Becker, G M Bernstein, J Blazek, H Camacho, A Campos, A Carnero Rosell, M Carrasco Kind, R Cawthon, C Chang, R Chen, J Cordero, M Crocce, C Davis, J DeRose, H T Diehl, S Dodelson, C Doux, A Drlica-Wagner, K Eckert, T F Eifler, F Elsner, X Fang, P Fosalba, O Friedrich, M Gatti, G Giannini, D Gruen, R A Gruendl, I Harrison, W G Hartley, H Huang, E M Huff, D Huterer, E Krause, N Kuropatkin, P-F Leget, P Lemos, A R Liddle, J McCullough, J Muir, J Myles, A Navarro-Alsina, S Pandey, Y Park, A Porredon, M Raveri, M Rodriguez-Monroy, R P Rollins, A Roodman, R Rosenfeld, A J Ross, C Sánchez, J Sanchez, L F Secco, E Sheldon, T Shin, M A Troxel, I Tutusaus, T N Varga, N Weaverdyck, R H Wechsler, B Yin, Y Zhang, J Zuntz, M Aguena, S Avila, D Bacon, E Bertin, S Bocquet, D Brooks, J García-Bellido, K Honscheid, M Jarvis, T S Li, J Mena-Fernández, C To, R D Wilkinson, DES Collaboration, Dark Energy Survey Year 3 results: magnification modelling and impact on cosmological constraints from galaxy clustering and galaxy–galaxy lensing, Monthly Notices of the Royal Astronomical Society, Volume 523, Issue 3, August 2023, Pages 3649–3670, https://doi.org/10.1093/mnras/stad1594

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Monthly Notices of the Royal Astronomical Society

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This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.

Abstract

We study the effect of magnification in the Dark Energy Survey Year 3 analysis of galaxy clustering and galaxy-galaxy lensing, using two different lens samples: a sample of luminous red galaxies, redMaGiC, and a sample with a redshift-dependent magnitude limit, MagLim. We account for the effect of magnification on both the flux and size selection of galaxies, accounting for systematic effects using the Balrog image simulations. We estimate the impact of magnification on the galaxy clustering and galaxy-galaxy lensing cosmology analysis, finding it to be a significant systematic for the MagLim sample. We show cosmological constraints from the galaxy clustering autocorrelation and galaxy-galaxy lensing signal with different magnifications priors, finding broad consistency in cosmological parameters in ΛCDM and wCDM. However, when magnification bias amplitude is allowed to be free, we find the two-point correlation functions prefer a different amplitude to the fiducial input derived from the image simulations. We validate the magnification analysis by comparing the cross-clustering between lens bins with the prediction from the baseline analysis, which uses only the autocorrelation of the lens bins, indicating that systematics other than magnification may be the cause of the discrepancy. We show that adding the cross-clustering between lens redshift bins to the fit significantly improves the constraints on lens magnification parameters and allows uninformative priors to be used on magnification coefficients, without any loss of constraining power or prior volume concerns. © 2023 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society.

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Immediate access

ISSN

0035-8711

DOI

10.1093/mnras/stad1594

Version

Final Published Version

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UA Faculty Publications