Fermi Gamma-ray Space Telescope

The low-energy gamma-ray sky seen by Fermi-LAT

Thibaut desgardin
Thibaut Desgardin, Johann Cohen-Tanugi, Andrew Strong, on behalf of the Fermi LAT Collaboration

Abstract:

Fermi-LAT has mainly been used to study the sky above 100 MeV. The new event processing (Pass 8) allows the range to be extended down to much lower energies. For interstellar emission studies, this is of great value since it will reach below the range where hadronic emission dominates, and allows the leptonic part (bremsstrahlung, inverse Compton) to be distinguished. We discuss the event selections, energy response, and analysis methods which are required to use low-energy data in an optimal way. We also present preliminary full sky maps, and compare these with CGRO/COMPTEL skymaps. The potential for interstellar emission studies will be addressed.