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• W2801909269 abstract "Interpreting the small-scale clustering of galaxies with halo models can elucidate the connection between galaxies and dark matter haloes. Unfortunately, the modelling is typically not sufficiently accurate for ruling out models statistically. It is thus difficult to use the information encoded in small scales to test cosmological models or probe subtle features of the galaxy–halo connection. In this paper, we attempt to push halo modelling into the ‘accurate’ regime with a fully numerical mock-based methodology and careful treatment of statistical and systematic errors. With our forward-modelling approach, we can incorporate clustering statistics beyond the traditional two-point statistics. We use this modelling methodology to test the standard Λ cold dark matter (ΛCDM) + halo model against the clustering of Sloan Digital Sky Survey (SDSS) seventh data release (DR7) galaxies. Specifically, we use the projected correlation function, group multiplicity function, and galaxy number density as constraints. We find that while the model fits each statistic separately, it struggles to fit them simultaneously. Adding group statistics leads to a more stringent test of the model and significantly tighter constraints on model parameters. We explore the impact of varying the adopted halo definition and cosmological model and find that changing the cosmology makes a significant difference. The most successful model we tried (Planck cosmology with Mvir haloes) matches the clustering of low-luminosity galaxies, but exhibits a 2.3σ tension with the clustering of luminous galaxies, thus providing evidence that the ‘standard’ halo model needs to be extended. This work opens the door to adding interesting freedom to the halo model and including additional clustering statistics as constraints." @default.
• W2801909269 created "2018-05-17" @default.
• W2801909269 creator A5011769443 @default.
• W2801909269 creator A5023338950 @default.
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• W2801909269 creator A5069355407 @default.
• W2801909269 creator A5070394199 @default.
• W2801909269 creator A5082171734 @default.
• W2801909269 date "2018-04-19" @default.
• W2801909269 modified "2023-09-28" @default.
• W2801909269 title "Towards accurate modelling of galaxy clustering on small scales: testing the standard ΛCDM + halo model" @default.
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