Stellar and Weak Lensing Profiles of Massive Galaxies in the Hyper-Suprime Cam Survey and in Hydrodynamic Simulations

Abstract

We perform a consistent comparison of the mass and mass profiles of massive ($M_{\star }>10^{11.4}{M}_{\odot }$) central galaxies at z~0.4 from deep Hyper Suprime-Cam (HSC) observations and from the Illustris, TNG100, and Ponos simulations. Weak lensing measurements from HSC enable measurements at fixed halo mass and provide constraints on the strength and impact of feedback at different halo mass scales. We compare the stellar mass function (SMF) and the Stellar-to-Halo Mass Relation (SHMR) at various radii and show that the radius at which the comparison is performed is important. In general, Illustris and TNG100 display steeper values of $\alpha$ where $M_{\star }\propto M_{\mathrm{vir}}^{\alpha }$. These differences are more pronounced for Illustris than for TNG100 and in the inner rather than outer regions of galaxies. Differences in the inner regions may suggest that TNG100 is too efficient at quenching in-situ star formation at $M_{\mathrm{vir}}\simeq 10^{13}{M}_{\odot }$ but not efficient enough at $M_{\mathrm{vir}}\simeq 10^{14}{M}_{\odot }$. The outer stellar masses are in excellent agreement with our observations at $M_{\mathrm{vir}}\simeq 10^{13}{M}_{\odot }$, but both Illustris and TNG100 display excess outer mass as $M_{\mathrm{vir}}\simeq 10^{14}{M}_{\odot }$ (by ~0.25 and ~0.12 dex, respectively). We argue that reducing stellar growth at early times in $M_{\star }\sim 10^{9-10}{M}_{\odot }$ galaxies would help to prevent excess ex-situ growth at this mass scale. The Ponos simulations do not implement AGN feedback and display an excess mass of ~0.5 dex at $r<30$ kpc compared to HSC which is indicative of over-cooling and excess star formation in the central regions. Joint comparisons between weak lensing and galaxy stellar profiles are a direct test of whether simulations build and deposit galaxy mass in the correct dark matter halos and thereby provide powerful constraints on the physics of feedback and galaxy growth.

arXiv comment16 pages, 8 figures, submitted to MNRAS

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