Search for Dark Matter Annihilation Signals from the Fornax Galaxy Cluster with H.E.S.S
The Fornax galaxy cluster was observed with the High Energy Stereoscopic System (H.E.S.S.) for a total live time of 14.5 hours, searching for very-high-energy (VHE, E>100 GeV) gamma-rays from dark matter (DM) annihilation. No…
Limits on an energy dependence of the speed of light from a flare of the active galaxy PKS 2155-304
In the past few decades, several models have predicted an energy-dependence of the speed of light in the context of quantum gravity. For cosmological sources such as active galaxies, this minuscule effect can add…
On design studies for future 50 GeV arrays of imaging air Cherenkov telescopes
Arrays of imaging air Cherenkov telescopes (IACTs) like VERITAS, HESS have been recently proposed as the instruments of the next generation for ground based very high energy gamma-ray astronomy invading into 50-100 GeV energy…