The Low End: Why CTA is Interested in Low-Energy Gamma Rays

The low energies from CTA’s perspective are those on the low edge (20 GeV to around 200 GeV) of its full energy range between 20 GeV and 300 TeV. Why are these low energies important and what do scientists hope to discover through their study? This is an overview of why scientists are scrambling to push for excellent sensitivity of CTA in this lower-energy band.