First results from the IllustrisTNG simulations: the galaxy colour bimodality

We introduce the first two simulations of the IllustrisTNG project, a next generation of cosmological magnetohydrodynamical simulations, focusing on the optical colours of galaxies. We explore TNG100, a rerun of the original Illustris box, and TNG300, which includes 2 × 2500<SUP>3</SUP> resolution elements in a volume 20 times larger. Here, we present first results on the galaxy colour bimodality at low redshift. Accounting for the attenuation of stellar light by dust, we compare the simulated (g - r) colours of 10<SUP>9</SUP> < M<SUB>⋆</SUB>/M<SUB>☉</SUB> < 10<SUP>12.5</SUP> galaxies to the observed distribution from the Sloan Digital…

• NA
  National Aeronautics and Space Administration

  Awards: HST-HF2-51341.001-A, HST-HF-51384.001-A
• NS
  National Sleep Foundation

  Award: AST-1402480
• ER
  European Research Council

  Award: EXAGAL-308037