1612.04825
Galaxy-galaxy lensing in EAGLE: comparison with data from 180 square degrees of the KiDS and GAMA surveys
Velliscig, Cacciato, Hoekstra, et al
Present predictions for the gg lensing profile from the EAGLE hydro cosmo sim at z=0.18, in the spatial range 0.02 < R/(Mpc/h) < 2, and for 5 log qui-spaced stellar mass bins in the range 10.3<log10(Mstar/Msun)<11.8. Compare these excess surface density profiles to the observed signal from BG galaxies imaged by KiDS and spectroscopically confirmed FG galaxies from GAMA. Exploiting the GAMA galaxy group catalogue, the profiles of central and satellite galaxies are computed separately for groups with at least 5 members to minimize contamination. EAGLE predictions are in broad agreement with the observed profiles for both central and satellite galaxies, although the signal is underestimated at R~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. Report the inferred stellar-to-halo mass relation and find good agreement with recent published results. Note how the precision of the gg lensing profiles in the sims holds the potential to constrain fine-grained aspects of the galaxy-dark matter connection.
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