Very-High Energy Gamma Astrophysics

High energy photons are a powerful probe for astrophysics and for fundamental physics under extreme conditions. During the recent years, our knowledge of the most violent phenomena in the Universe has impressively progressed thanks to the advent of new detectors for high energy gamma rays. Observation of γ-rays gives an exciting view of the high energy universe thanks to the current (AGILE) and future (GLAST) satellite-based telescopes and to the current and future groundbased detectors like the Cherenkov telescopes (H.E.S.S. and MAGIC in particular), which discovered in the recent years more than 60 new very-high energy sources. The progress achieved with the last generation of Cherenkov telescopes is comparable to the one drawn by EGRET with respect to the previous γ-ray satellite detectors. This article reviews the present status of high-energy gamma astrophysics, with emphasis on the recent results and on the experimental developments.