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Astronomy Colloquium

Wednesday, January 6, 2021
4:00pm to 5:00pm
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Online Event
Cosmic Rays in Multiphase Gas
Ellen Zweibel, W. L. Kraushaar Professor of Astronomy and Physics, University of Wisconsin-Madison,

Cosmic rays  appear to be universal in galaxies with star formation  or nuclear activity. They play a role in the dynamics, energy balance, and stability of the diffuse gas in these systems, and are now included in many state of the art models of galaxy formation and evolution. The exchange of energy and momentum between cosmic rays and thermal gas is largely collisionless, mediated by kinetic scale plasma waves. The properties of these waves depend both on local conditions and the global structure of the thermal gas, introducing complex feedback loops that are only beginning to be probed theoretically and incorporated into models. I will discuss some recent progress in this area, focusing on the role of interstellar clouds.

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For more information, please contact Mansi Kasliwal by email at [email protected] or visit