Comparison of cosmological simulations and deep submillimetre galaxy surveys

Recent progress in submillimetre surveys by single-dish telescopes allows us to further challenge the consistency between cosmological simulations and observations. In particular, we compare our simulations that include dust formation and destruction with the recent SCUBA-2 surveys (‘STUDIES’) by putting emphases on basic observational properties of dust emission such as dust temperature, size of infrared (IR)-emitting region, IR luminosity function, and IRX–β relation. After confirming that our models reproduce the local galaxy properties, we examine the STUDIES sample at |z| ≈ 1–4, finding that the simulation reproduces the aforementioned quantities except for the |z| ≳ 2 IR luminosity function at the massive end (∼1013 L⊙). This means that the current simulation correctly reproduces the overall scaling between the size and luminosity (or star formation rate) of dusty region, but lacks extreme starburst phenomena at |z| ≳ 2. We also discuss extinction curves and possible active galactic nucleus contribution.