THE GALACTIC CENTER REGION SEEN IN VERY-HIGH-ENERGY GAMMA-RAYS

The Galactic Centre region is a key region for particle astrophysics at very high energies (E>100 GeV) with ground-based imaging atmospheric Cherenkov telescope observations. The High Energy Stereoscopic System observations led to the detection of the source HESS J1745-290 spatially coincident with the supermassive black hole Sagittarius A*, and diffuse gamma-ray emission has been detected along the Galactic plane, most likely due to cosmic-ray interactions with the dense gas of the Central Molecular Zone. The rich 2004-2013 observational dataset allows for detailed spectral and morphological studies in the inner 200 pc of the Galactic Centre. The new results allow us to make an important statement regarding the location and origin of the accelerator of the parent ultrarelativistic particles. The Galactic Centre region harbors a large amount of dark matter. Given its proximity, it is one of the most promising target to look for dark matter particle annihilations. I will discuss the veryhigh-energy gamma-ray observations of the Galactic Centre in the context of the origin of Galactic cosmic rays and of the dark matter particle search.