Dr. Kohta Murase visit our group and give colloquium speech

Nov 18, 2011

“Multi-Messenger Signatures of Ultra-High-Energy Cosmic Rays”

The origin of ultra-high-energy cosmic rays (UHECRs), has been one of the biggest mysteries in physics and astronomy.  The multi-messenger approach, using neutrinos and gamma rays as well as cosmic rays, is necessary in order to reveal the sources.  Recently a Gton neutrino detector, IceCube, was completed, and several Cherenkov gamma-ray telescopes as well as the gamma-ray satellite Fermi are now operating, so that the era of the multi-messenger observations is coming. 

The importance the multi-messenger approach is even greater if cosmic rays are transiently produced by bursts and flares and/or they are heavy nuclei rather protons, since cosmic rays experience long time delays and/or significant deflections due to cosmic magnetic fields. In this talk, we discuss characteristic signals from extragalactic astrophysical sources, which are crucial for identifying the accelerators of UHECRs.