University of Maryland
Atlantic Building, Room 2400
4:30 PM Monday, February 1, 2016
Coffee, Tea & Snacks 4:15-4:30 PM

Vladimir Ptuskin
Where Are Cosmic Ray Pevatrons?

The origin of Galactic cosmic rays is associated with the most energetic astronomical objects in the Galaxy, primarily with the supernova remnants. It is usually assumed that the particle energy about few PeV/Z (1 PeV = 10^15 eV; Z is the particle charge) is the upper limit for acceleration in the majority of supernova remnants. It explains the corresponding break (the knee) in a power law energy spectrum and the changes of elemental composition of cosmic rays above the knee. We discuss how modern theory of particle acceleration by supernova shock waves with the subsequent diffusion in the interstellar magnetic fields is compatible with this scenario and how gamma ray astronomy may demonstrate the existence of Pevatrons in the Galaxy.

Sponsored by: Department of Physics and the Institute for Physical Science and Technology, University of Maryland. For information call Victoria at (301) 405-4811 or go to the UMD Space Physics group seminar web site.

There is free parking after 4:00 PM in lot B (the big parking garage across the street from the ATL building). There are a limited number of spaces in lot Q next to the new ATL wing with free parking after 4PM even when there is a basketball game on campus.