Investigating FIR Line Diagnostics and Dust Evolution in High-Redshift Galaxies with Galaxy Simulations
Speaker: Kosei Matsumoto (Ghent University)
Abstract:
Recent ALMA and JWST observations have revealed strong ionized emission lines and evidence for relatively flat dust attenuation curves in high-redshift galaxies, posing new challenges for our understanding of the interstellar medium and dust evolution. In the first half of this talk, I will present synthetic UV-to-millimetre observations of galaxies at z=3–8.5 from the MEGATRON cosmological simulations, generated using the radiative transfer code SKIRT. I will discuss how star formation, stellar feedback, and the initial mass function shape far-infrared (FIR) emission lines such as [O III] and [C II], and explore the physical conditions that give rise to the strong ionized emission observed in high-redshift galaxies. In the second half of the talk, I will introduce galaxy simulations that self-consistently follow dust grain-size evolution and discuss how grain size evolution shapes galaxy spectral energy distributions and dust attenuation curves.