A Hot DOG Forged in FIRE: Nuclear and Starburst Spectral Decomposition of a Luminous Infrared Galaxy Simulation with a Resolved Dust Torus

Ultraluminous infrared galaxies are powered by a combination of rapid star formation and active galactic nucleus (AGN) emission, but their relative importance is not always observationally clear. We study the galactic continuum spectrum of a cosmologically simulated \sim 4 \times 10^{10} M_\odot stellar mass starburst galaxy at redshift z\sim 4.4 that refines down to resolve beyond the dust sublimation boundary of its super-Eddington-accreting \sim 10^7 M_\odot supermassive black hole.