12 January 2018

Shane Davis

January 16th at 11:00 Professor Shane Davis will give a talk entitled "Simulations of Radiation Pressure and Supernovae Driven Winds: Glows or Blows Launching Galatic Flows"

Abstract: Galactic winds are ubiquitous in most rapidly star-forming galaxies. They are thought to be crucial to the process of galaxy formation and evolution, regulating star formation, shaping the stellar mass, the mass-metallicity relation, and enriching the intergalactic medium with metals. Although many theoretical mechanisms have been proposed, the physics of galactic winds remains unclear. Some ideas include heating of the interstellar medium by supernovae, radiation pressure of starlight on dust grains, or cosmic rays. The growing observations of multiphase structure in galactic winds in a large number of galaxies have not been well explained by any models. In this talk I will focus on the models of supernova- and radiation-pressure-driven winds of cold gas.  Using numerical simulations, I will assess the relative merits of these driving mechanisms, including the cloud survival time and efficiency of momentum coupling, with the ultimate goal of determining whether a sufficient column of cold cloud material can be accelerated to the observed velocities.