The AGN Jet Model of the Fermi Bubbles

Understand

The nature and origin of the Fermi bubbles detected in the inner Galaxy remain elusive.

• In this paper, we briefly discuss some recent theoretical and observational developments, with a focus on the AGN jet model.
• Analogous to radio lobes observed in massive galaxies, the Fermi bubbles could be naturally produced by a pair of opposing jets emanating nearly along the Galaxy's rotation axis from the Galactic center.
• Our two-fluid hydrodynamic simulations reproduce quite well the bubble location and shape, and interface instabilities at the bubble surface could be effectively suppressed by shear viscosity.