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Stellar and Weak Lensing Profiles of Massive Galaxies in the Hyper-Suprime Cam Survey and in Hydrodynamic Simulations
Felipe Ardila, Song Huang, Alexie Leauthaud, Benedikt Diemer, Annalisa Pillepich, Rajdipa Chowdhury, Davide Fiacconi, Jenny Greene, Andrew Hearin, Lars Hernquist, Piero Madau, Lucio Mayer, Sébastien Peirani, Enia Xhakaj
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We perform a consistent comparison of the mass and mass profiles of massive (M_⋆ > 10^(11.4)M_⊙) 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 α where M_⋆∝Mᵥᵢᵣ^α. 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 Mᵥᵢᵣ≃10¹³ M_⊙ but not efficient enough at Mᵥᵢᵣ≃10¹⁴ M_⊙. The outer stellar masses are in excellent agreement with our observations at Mᵥᵢᵣ≃10¹³ M_⊙, but both Illustris and TNG100 display excess outer mass as Mᵥᵢᵣ≃10¹⁴ M_⊙ (by ~0.25 and ~0.12 dex, respectively). We argue that reducing stellar growth at early times in M_⋆ ∼10⁹⁻¹⁰ M_⊙ 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.
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