Fermi Gamma-ray Space Telescope

Detailed Look at the 133 GeV Feature in Pass 7 and Pass 8

Regina Caputo
on behalf of the Fermi-LAT collaboration

Abstract:

A gamma-ray emission line, if detected, is a strong signature of the annihilation or decay of dark matter. A tentative emission feature localized near the Galactic center was reported by several groups at $sim$133 GeV in the first 3.7 years of Fermi-LAT data. Since the previous Fermi-LAT Collaboration analysis, which used the Pass 7 reprocessed (P7Rep) event analysis, two more years of data are available. Additionally, the collaboration is transitioning to a new event-level analysis framework, Pass 8 (P8). Both the event-level reconstruction and selection have been improved with P8. We will present a detailed comparison of the P7Rep and P8 data near 133 GeV in the Galactic center and two control regions: the Earth Limb and the Galactic ridge.