The halo model with beyond-linear halo bias: unbiasing cosmological constraints from galaxy-galaxy lensing and clustering

Mahony, Constance; Dvornik, Andrej; Mead, Alexander; Heymans, Catherine; Asgari, Marika; Hildebrandt, Hendrik; Miyatake, Hironao; Nishimichi, Takahiro; Reischke, Robert

Abstract

We determine the error introduced in a joint halo model analysis of galaxy-galaxy lensing and galaxy clustering observables when adopting the standard approximation of linear halo bias. Considering the Kilo-Degree Survey, we forecast that ignoring the non-linear halo bias would result in up to 5 sigma offsets in the recovered cosmological parameters describing structure growth, sigma_8 , and the matter density parameter, Ω_m. We include the scales 10 ^−1.3 < r_p /h−1 Mpc < 10 in the data vector, and the direction of these offsets are shown to depend on the freedom afforded to the halo model through other nuisance parameters. We conclude that a beyond-linear halo bias correction must therefore be included in future cosmological halo model analyses of large-scale structure observables on non-linear scales.

Citation

Mahony, C., Dvornik, A., Mead, A., Heymans, C., Asgari, M., Hildebrandt, H., …Reischke, R. (2022). The halo model with beyond-linear halo bias: unbiasing cosmological constraints from galaxy-galaxy lensing and clustering. Monthly notices of the Royal Astronomical Society, 515(2), 2612–2623. https://doi.org/10.1093/mnras/stac1858

• Journal Article Type: Article
• Acceptance Date: Jun 29, 2022
• Online Publication Date: Jul 6, 2022
• Publication Date: 2022-09
• Deposit Date: Aug 15, 2022
• Publicly Available Date: Aug 16, 2022
• Journal: Monthly notices of the Royal Astronomical Society
• Print ISSN: 0035-8711
• Publisher: Oxford University Press
• Peer Reviewed: Peer Reviewed
• Volume: 515
• Issue: 2
• Pages: 2612–2623
• DOI: https://doi.org/10.1093/mnras/stac1858
• Keywords: Methods: analytical; Cosmological parameters; Large-scale structure of Universe
• Public URL: https://hull-repository.worktribe.com/output/4055421