Prof.
Peter von Ballmoos
(Institut de Recherche en Astrophysique et Planétologie, Toulouse)
5/14/09, 2:55 PM
Dr
Emmanuel Moulin
(CEA Saclay)
5/14/09, 3:45 PM
The Galactic Centre region has been observed by the High Energy Stereoscopic System (H.E.S.S.) array of ground-based Cherenkov telescopes since 2004 leading to the detection of the very-high-energy (VHE, E > 100 GeV) gamma-ray source HESS J1745−290 spatially coincident with the supermassive black hole Sgr A*. Diffuse TeV gamma-ray emission has been detected along the Galactic plane, most...
Mr
Matthias Lorentz
(Irfu, CEA Saclay)
5/15/09, 5:00 PM
ome extensions to the Standard Model lead to the introduction of Lorentz symmetry breaking terms, expected to induce deviations from Lorentz symmetry around the Planck scale. A parameterization of Lorentz invariance violating (LIV) effects can be introduced by adding an effective term to the photon dispersion relation. This affects the kinematics of electron-positron pair creation by TeV gamma...
Mr
Vikas Joshi
(Max Planck Institute for Nuclear Physics, Heidelberg, Germany)
5/15/09, 5:20 PM
The High Altitude Water Cherenkov (HAWC) high-energy gamma-ray observatory has recently been completed near the Sierra Negra in central Mexico. HAWC consists of 300 Water Cherenkov Detectors, each containing 200 tons of purified water and 4 PMT's (three 8” and one 10”), that cover a total surface area of 20,000 m^2. HAWC observes gamma rays in the 0.1–100 TeV range and has a sensitivity to...
Dr
Silvia Vernetto
(IFSI-INAF)
5/15/09, 6:05 PM
In this work we discuss the interest and scientific potential of galactic gamma astronomy at very high energy (E > 100 TeV),illustrating different predictions for the properties of the diffuse galactic gamma ray fluxes. For photons of such high energy it is very important to take into account absorption due to pair production interactions, including the contribution of interactions with...
