Galaxy-Galaxy Lensing in EAGLE: comparison with data from 180 square degrees of the KiDS and GAMA surveys

Abstract

We present predictions for the galaxy-galaxy lensing profile from the EAGLE hydrodynamical cosmological simulation at redshift z=0.18, in the spatial range 0.02 < R/(Mpc/h) < 2, and for five logarithmically equi-spaced stellar mass bins in the range 10.3 < ${\log }_{10}$(Mstar/ $M_{\odot }$) < 11.8. We compare these excess surface density profiles to the observed signal from background galaxies imaged by the Kilo Degree Survey around spectroscopically confirmed foreground galaxies from the GAMA survey. Exploiting the GAMA galaxy group catalogue, the profiles of central and satellite galaxies are computed separately for groups with at least five members to minimise contamination. EAGLE predictions are in broad agreement with the observed profiles for both central and satellite galaxies, although the signal is underestimated at R$\approx$0.5-2 Mpc/h for the highest stellar mass bins. When central and satellite galaxies are considered simultaneously, agreement is found only when the selection function of lens galaxies is taken into account in detail. Specifically, in the case of GAMA galaxies, it is crucial to account for the variation of the fraction of satellite galaxies in bins of stellar mass induced by the flux-limited nature of the survey. We report the inferred stellar-to-halo mass relation and we find good agreement with recent published results. We note how the precision of the galaxy-galaxy lensing profiles in the simulation holds the potential to constrain fine-grained aspects of the galaxy-dark matter connection.

15 pages, 10 figures, submitted to MNRAS

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• Unveiling Galaxy Bias via the Halo Model, KiDS and GAMA
• The galaxy-subhalo connection in low-redshift galaxy clusters from weak gravitational lensing
• Weak lensing in the Horizon-AGN simulation lightcone. Small scale baryonic effects
• Joint galaxy-galaxy lensing and clustering constraints on galaxy formation
• Halo mass and weak galaxy-galaxy lensing profiles in rescaled cosmological $N$-body simulations
• KiDS+VIKING+GAMA: Testing semi-analytic models of galaxy evolution with galaxy-galaxy-galaxy lensing
• The case for two-dimensional galaxy-galaxy lensing
• Weak lensing constraints on the stellar-to-halo mass relation of galaxy groups with simulation-informed scatter