The Fermi Bubbles Revisited

Understand

We analyze 60 months of all sky data from the Fermi-LAT.

• The Fermi Bubble structures discovered previously are clearly revealed by our analysis.
• With more data and, consequently, better statistics we can now divide each bubble into constant longitude slices to investigate their gross $\gamma$-ray spectral morphology.
• While the detailed spectral behaviour of each slice derived within our analysis is somewhat dependent on the assumed background model, we find, robustly, a relative deficit of the flux at low energies (i.e., hardening) towards the top of the South Bubble.