APEC Seminar (Astronomy - Particle Physics - Experimental Physics - Cosmology)

Speaker: Tim Heckman (Johns Hopkins University)
Title: GALACTIC WINDS: Physics, Phenomenology, and Implications
Date (JST): Thu, May 30, 2019, 13:30 - 14:30
Place: Seminar Room A
Related File: 2341.pdf
Abstract: I will review galactic winds driven by populations of massive stars. I will describe the basic physics that drives winds and dictates their impact on the interstellar and circum-galactic medium. I will describe observations of the multi-phase outflow in the proto-typical starburst galaxy M 82. I will then discuss the systematic dependence of wind properties on such key parameters as the star-formation-rate, galaxy size, and mass (circular velocity), and show that there explain the strong rise in the incidence rate of winds with redshift. I will also compare these empirical scaling relations with sub-grid recipes commonly adopted in models and simulations. Finally, I will describe observations that demonstrate the impact of winds on the chemical evolution of galaxies and on the properties of the circum-galactic medium.