VHE Gamma Ray Astronomy : Higher and Higher Precision Measurements for Faint Blue Flashes(The Centenary of the Discovery of Cosmic Rays)

Abstract

Very High Energy (VHE) Gamma Ray Astronomy is rapidly developing with third generation Imaging Atmospheric Cherenkov Telescopes (IACTs), H.E.S.S., MAGIC and VERITAS. Nowadays, about 150 VHE galactic, and extragalactic gamma-ray sources have been discovered. We are attacking to solve the long standing problem of the cosmic ray origin with these new tools. In this occasion of the 100th anniversary of the discovery of cosmic rays, we overview the history of VHE Gamma Ray Astronomy, the current status of this field, and the international future project CTA (Cherenkov Telescope Array).