Reionization in Technicolor

We present the Technicolor Dawn simulations, a suite of cosmological radiationhydrodynamic simulations of the first 1.2 billion years. By modeling a spatiallyinhomogeneous UVB on-the-fly with 24 frequencies and resolving dark matter halos down to 10 8 M within 12h -1 Mpc volumes, our simulations unify observations of the intergalactic and circumgalactic media, galaxies, and reionization into a common framework. The only empirically-tuned parameter, the fraction f esc,gal (z) of ionizing photons that escape the interstellar medium, is adjusted to match observations of the Lyman- forest and the cosmic microwave background. With this single calibration, our simulations reproduce the history of reionization; the stellar mass-star formation rate relation of galaxies; the number density and metallicity of damped Lyman- absorbers (DLAs) at z 5; the abundance of weak metal absorbers; the ultraviolet background (UVB) amplitude; and the Lyman- flux power spectrum at z = 5.4. The galaxy stellar mass and UV luminosity functions are underproduced by 2, suggesting an overly vigorous feedback model. The mean transmission in the Lyman- forest is underproduced at z 4 Ryd UVB. Solving this problem by increasing metal yields would overproduce both weak absorbers and DLA metallicities. Instead, the observed strength of high-ionization emission from high-redshift galaxies and absorption from their environments suggest that the ionizing flux from conventional stellar population models is too soft.