HESS High-energy astrophysics: Mapping the gamma-ray sky

Physics – Geophysics

Scientific paper

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Scientific paper

The very-high-energy part of the gamma-ray spectrum (energies above a few tens of GeV), is accessible from the ground, using arrays of mirrors and photomultipliers. In addition, these ground-based arrays are big enough to detect even small fluxes of gamma rays, making them sensitive instruments for mapping the gamma-ray sky. The HESS array (High Energy Stereoscopic System; also a reference to Victor Hess, awarded the Nobel Prize for Physics in 1936 for his discovery of cosmic radiation) in Namibia has been working for nearly two years now and has already begun to survey gamma-ray sources such as supernova remnants and the galactic centre, with spectacular results that we summarize here.

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