Event Detail Information
Astronomy Colloquium: "Cosmic Rays and Their Role in Galaxies" - Ellen Zweibel, University of Wisconsin
Cosmic rays comprise only about a billionth of interstellar particles by number, but they carry as much energy as the thermal particles. Except for very rare direct collisions, their interaction with the interstellar medium is entirely mediated by the galactic magnetic field. This interaction exchanges energy and momentum between the background medium and the cosmic rays, can heat the interstellar gas, and can drive a galactic wind.