RSAA Colloquia / Seminars / Feast-of-Facts: Friday, 15 February 2019, 14:00-15:00; CSO Common Room

Chang-Goo Kim

"Introducing TIGRESS: where gravity and feedback meet the real ISM"

The interstellar medium (ISM) is the heart of the cosmic evolution, where the cosmic baryonic cycle ends with gravitational collapse to form stars and begins again by stellar feedback. Since the two competing processes are tightly coupled with the (thermo)dynamical state of the ISM, numerical simulations of a complex, heterogeneous ISM play a key role to advance our understanding in this subject. In this talk, I will describe recent achievements in modeling the star-forming ISM using a novel numerical framework, called TIGRESS (Three-phase ISM in Galaxies Resolving Evolution with Star formation and Supernova feedback). In the TIGRESS framework, a part of galactic disks is self-consistently simulated by solving MHD equations with self-gravity and supernova/FUV radiation feedback from massive young stars. With the help of realistic simulations, I will present how we build (1) effective theories for star formation/ISM/feedback and (2) synthetic observations to interpret detailed and diverse observations. I will primarily focus on theories for self-regulation of star formation rates and multiphase galactic outflows to provide a physical understanding of observed correlations between star formation rates, outflow properties, and galactic conditions. I will then close by introducing our ongoing projects on multiwavelength synthetic observations, with a case study for dust polarization maps.