Steady-State Hadronic Gamma-Ray Emission from 100-Myr-Old Fermi Bubbles

Roland M. Crocker, Geoffrey V. Bicknell, Ettore Carretti +2

The Fermi Bubbles are enigmatic γ-ray features of the Galactic bulge. Both putative activity (within $\sim$ few $\times$ Myr) connected to the Galactic center super-massive black h…