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Renneby, Malin; Hilbert, Stefan; Angulo, Raul E. (2018): Halo mass and weak galaxy-galaxy lensing profiles in resealed cosmological N-body simulations. In: Monthly Notices of the Royal Astronomical Society, Vol. 479, No. 1: pp. 1100-1124
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Abstract

We investigate 3D density and weak lensing profiles of dark matter haloes predicted by a cosmology-resealing algorithm for N-body simulations. We extend the resealing method of Angulo & White and Angulo & Hilbert to improve its performance on intrahalo scales by using models for the concentration mass redshift relation based on excursion set theory. The accuracy of the method is tested with numerical simulations carried out with different cosmological parameters. We find that predictions for median density profiles are more accurate than similar to 5 per cent for haloes with masses of 10(12.0) - 10(14.5) h(-1) M-circle dot for radii 0.05 < r/r(200m) < 0.5, and for cosmologies with Omega(m) is an element of [0.15, 0.40] and sigma (8) is an element of [0.6, 1.0]. For larger radii, 0.5 < r/r(200m) < 5, the accuracy degrades to similar to 20 per cent, due to inaccurate modelling of the cosmological and redshift dependence of the splashback radius, For changes in cosmology allowed by current data, the residuals decrease to less than or similar to 2 per cent up to scales twice the virial radius, We illustrate the usefulness of the method by estimating the mean halo mass of a mock galaxy group sample. We find that the algorithm's accuracy is sufficient for current data. Improvements in the algorithm, particularly in the modelling of baryons, are likely required for interpreting future (dark energy task force stage IV) experiments.