Oral Presentation

Evolution of dust and PAHs in Milky Way-like galaxies

Author(s): Hiroyuki Hirashita (ASIAA)

Presenter: Hiroyuki Hirashita (ASIAA)

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. For these radiative processes, the dust grain size is important; thus, detailed modeling of how the grain size distribution (distribution function of grain radii in a galaxy) evolves provides a basic understanding for dust extinction and emission. In this talk, 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. Our model also includes the polycyclic aromatic hydrocarbons (PAHs), which have prominent features in both extinction curves and SEDs. We test our models against the Milky Way data. This model can be implemented in a cosmological galaxy simulation to predict dust properties in a wide variety of galaxies at various epochs in the Universe.