The halo model with beyondlinear halo bias: unbiasing cosmological constraints from galaxygalaxy lensing and clustering
Abstract
We determine the error introduced in a joint halo model analysis of galaxygalaxy lensing and galaxy clustering observables when adopting the standard approximation of linear halo bias. Considering the KiloDegree Survey, we forecast that ignoring the nonlinear halo bias would result in up to 5σ offsets in the recovered cosmological parameters describing structure growth, S_{8}, and the matter density parameter, Ω_{m}. We include the scales $10^{1.3}\lt r_{\rm {p}} \ / h^{1}\, \mathrm{Mpc}\lt 10$ 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 beyondlinear halo bias correction must therefore be included in future cosmological halo model analyses of largescale structure observables on nonlinear scales.
 Publication:

Monthly Notices of the Royal Astronomical Society
 Pub Date:
 September 2022
 DOI:
 10.1093/mnras/stac1858
 arXiv:
 arXiv:2202.01790
 Bibcode:
 2022MNRAS.515.2612M
 Keywords:

 methods: analytical;
 cosmological parameters;
 largescale structure of Universe;
 Astrophysics  Cosmology and Nongalactic Astrophysics
 EPrint:
 v2: Version accepted in MNRAS. Minor clarifications and added robustness test, conclusions unchanged