Speaker
Dr
Marco Ajello
(Clemson University)
Description
Models of the extragalactic gamma-ray background (EGB) show that its intensity can be ascribed to the integrated emission of source populations already detected by the Fermi Large Area Telescope (LAT). Taking advantage of the sensitivity increase yielded by Pass 8, the new event-level analysis, we tested this hypothesis employing a photon fluctuation analysis above 50 GeV. For the first time we were able to resolve nearly the entire EGB and show that blazars contribute at least 85% of the EGB intensity. We will discuss how this analysis can be extended to lower energies and present our current understanding of the origin of the EGB.
Author
Dr
Marco Ajello
(Clemson University)
Co-author
mattia di mauro
(Stanford University)
