IPMU Colloquium

Speaker: Yasunobu Uchiyama (SLAC/Stanford)
Title: The Supernova Origin of Galactic Cosmic Rays
Date (JST): Wed, May 18, 2011, 15:30 - 17:00
Place: Lecture Hall
Related File: 460.pdf
Abstract: The origin of galactic cosmic rays will finally become a century-old-problem next year. It is widely believed that the galactic
cosmic rays are accelerated by shock waves associated with the expansion of supernova ejecta. Significant progress toward settlement of this conjecture has recently been made by gamma-ray observations of supernova remnants (SNRs) at GeV energies using the Large Area Telescope (LAT) onboard the Fermi Gamma-ray Space Telescope. Combined with the X-ray and TeV gamma-ray observations, the LAT observations of galactic SNRs provide important information about the magnetic field
amplification by cosmic-ray streaming instabilities, the efficiency with which the shock energy can be transferred to cosmic rays, and the process by which cosmic rays are released into interstellar medium. We will present the current status of our LAT observations of SNRs and discuss its implications to the long-standing problem of the origin of galactic cosmic rays.