The Fermi bubbles: update on multi-wavelength observations, numerical simulations, and implications to the past activities in the Galactic center

The Fermi Bubbles are a pair of giant lobes at the heart of the Milky Way, extending roughly 50 degrees north and south of the Galactic Center, and emitting photons with energies up to 100 GeV. This previously unknown structure could be evidence for past activity of the central supermassive black hole, or enhanced star formation towards the inner Galaxy. I will describe the most updated microwave observations from joint analysis with WMAP and Planck, and their shape and spectrum using most updated gamma-ray data from the Fermi Gamma-ray Space Telescope and dedicated observations with XMM-Newton. We will describe the current state of knowledge of the Bubbles’ spectrum, morphology and internal structure, and discuss theoretical proposals and numerical simulations for their nature and origin.