AM Seminar: Cosmic Ray Feedback in Galaxies

Speaker Name: 
Peng Oh
Speaker Title: 
Professor
Speaker Organization: 
University of California, Santa Barbara
Start Time: 
Monday, October 21, 2019 - 4:00pm
End Time: 
Monday, October 21, 2019 - 5:05pm
Location: 
Physical Sciences 114
Organizer: 
Abhishek Halder

Abstract

Cosmic Rays are energetic relativistic particles which are accelerated at shocks. They permeate our Galaxy and have a comparable energy density to the thermal gas. Even though they propagate at the speed of light, they are confined for much longer than the light crossing time, by scattering off tiny magnetic irregularities in the gas. In this process, they exchange momentum and energy with the gas. In recent years, there has been a growing realization that cosmic rays could have a profound effect on galaxy formation and evolution, and potentially drive galactic winds. Thus, micro-scale plasma physics can potentially affect structure formation on galactic scales. I will discuss the physics of cosmic rays, physical and  numerical challenges in simulating their influence, and prospects for the future. 

Bio

Peng Oh is a Professor of Physics at UC Santa Barbara, where he has been since 2003. He was an undergraduate in University of Chicago and Cambridge, did his PhD in Princeton (with David Spergel), and his postdoc at Caltech.

Event Type: 
Event