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We analyse the star formation rates (SFRs), colours, and dust extinctions ofgalaxies in massive (10^12.5-10^13.5 Msun) haloes at z~2 in high-resolution,cosmological zoom-in simulations as part of the Feedback in RealisticEnvironments (FIRE) project. The simulations do not model feedback from activegalactic nuclei (AGN) but reproduce well the observed relations between stellarand halo mass and between stellar mass and SFR. About half (a third) of thesimulated massive galaxies (massive central galaxies) at z~2 have broad-bandcolours classifying them as 'quiescent', and the fraction of quiescent centralsis steeply decreasing towards higher redshift, in agreement with observations.The progenitors of z~2 quiescent central galaxies are, on average, moremassive, have lower specific SFRs, and reside in more massive haloes than theprogenitors of similarly massive star forming centrals. The simulations furtherpredict a morphological mix of galaxies that includes disk-dominated,irregular, and early-type galaxies. However, our simulations do not reproducethe reddest of the quiescent galaxies observed at z~2. We also do not findevidence for a colour bimodality, but are limited by our modest sample size. Inour simulations, the star formation activity of central galaxies of moderatemass (Mstar~10^10-10^11 Msun) is affected by a combination of two distinctphysical processes. Outflows powered by stellar feedback result in ashort-lived (<100 Myr), but almost complete, suppression of star formationactivity after which many galaxies quickly recover and continue to form starsat normal rates. In addition, galaxies residing in slowly growing haloes tendto experience a moderate reduction of their SFRs ('cosmological starvation').The relative importance of these processes and AGN feedback is uncertain andwill be explored in future work.

Colours, Star formation Rates, and Environments of Star forming and Quiescent Galaxies at the Cosmic Noon