Extreme Gamma Rays from the Galactic Centre Region

The Galactic Centre region is unique for its intense activity across the wavebands. The gamma-ray emission here extends up to the highest photon energies so far measured (beyond 10 TeV) and spans the Central Molecular Zone (CMZ). The general spatial match between the gamma-ray and interstellar gas emission suggests the presence of cosmic-rays potentially reaching PeV energies. Where these cosmic-rays are being accelerated is still very much an open question although there are clues in the morphology and spectral properties of the gamma-ray emission. Further clues will come from the latest high resolution (30 arc-sec) survey of the molecular gas from the Mopra radio telescope in Australia. Such gas is likely the target for cosmic-ray collisions, generating GeV to multi-TeV gamma-ray emission detected by Fermi-LAT and HESS respectively. This talk will review our knowledge of the high energy Galactic Centre region and present a status of the Mopra CMZ survey. It will conclude with a discussion of what we might learn by combining the new Mopra CMZ data with the Fermi-LAT and HESS results.