GLAST and Very High Energy astrophysics
Résumé
The pioneering age of high energy gamma-ray astrophysics has come to an end for ground-based observatories as the 3rd generation of Atmospheric ˇCerenkov Telescopes (ACTs) come online. Meanwhile the next generation space-based observatory GLAST is being assembled and is scheduled for launch in 2007. At that point, gamma-ray astrophysics will enter again in a period comparable to the CGRO/EGRET epoch where the combination of ground based and space based observatories reshaped our knowledge in many ways. The instruments have evolved into more performant and efficient machines, making the two techniques very different in their conception, but getting ever closer in their energy ranges. Some aspects and constraints in the two techniques are described, focussing on a few scientific topics that would benefit from a coordinated approach.
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