Recent Activities

Dong Zhang:Stellar Feedback, Galactic Winds and Galaxy Formation

2019-01-07  

Abstract:Galaxy formation and evolution are driven by many physical processes, among them feedback is one of the most difficult ingredients to be understood. It has been widely believed that stellar feedback plays a crucial role in regulating star formation, shaping the stellar mass function and mass-metallicity relation, driving turbulence in the interstellar medium, and launching galactic winds, which are ubiquitous in most rapidly star-forming galaxies. Although important, the physics of stellar feedback is still unclear. Stellar feedback may be driven by overlapping supernovae explosions and radiation. The growing observations of multiphase structure in galactic winds and the interstellar medium in a large number of galaxies have not been well explained by any models. Using the state-of-the-art numerical simulations, I will assess the relative merits of these driving mechanisms for accelerating multiphase galactic winds to observed velocities, momentum flux boost during wind propagation, and interaction between supernova remnants, winds and giant molecular clouds.