演講資訊

摘要：

Dust extinction (absorption and scattering of stellar light) and emission are fundamental processes in characterizing the galaxy spectral energy distributions (SEDs) and in interpreting multi-band galaxy survey data. However, the evolution of dust properties (especially, grain size distribution and grain composition) affecting these processes has not been well understood. In this presentation, we first explain basic dust evolution processes that affect the grain size distribution. Next we introduce our recent modeling efforts toward the understanding of grain size distribution and grain composition. In these studies, we confirm that the extinction curves and dust emission SEDs in nearby galaxies are fairly reproduced by our models. The models are combined with a cosmological simulation, and are successful in reproducing the Milky Way extinction curve and dust emission SED. Based on the above success, we discuss what our model predicts for high-redshift galaxies, especially based on our recent efforts of radiative transfer calculations that directly link our predictions to observed dust properties at high redshift.