First results from the IllustrisTNG simulations: matter and galaxy clustering

Hydrodynamical simulations of galaxy formation have now reached sufficient volume to make precision predictions for clustering on cosmologically relevant scales. Here, we use our new IllustrisTNG simulations to study the non-linear correlation functions and power spectra of baryons, dark matter, galaxies, and haloes over an exceptionally large range of scales. We find that baryonic effects increase the clustering of dark matter on small scales and damp the total matter power spectrum on scales up to k ̃ 10 h Mpc<SUP>-1</SUP> by 20 per cent. The non-linear two-point correlation function of the stellar mass is close to a power-law over a wide range of scales and approximately invariant in time from…

• NA
  National Aeronautics and Space Administration

  Award: NNX17AG29G
• NS
  National Sleep Foundation

  Award: AST-1402480
• ER
  European Research Council

  Award: EXAGAL-308037