ORIGIN OF THE FERMI BUBBLE

Fermi has discovered two giant gamma-ray-emitting bubbles that extend nearly 10 kpc in diameter north and south of the Galactic center. The existence of the bubbles was first evidenced in X-rays detected by ROSAT and later WMAP detected an excess of radio signals at the location of the gamma-ray bubbles. We propose that periodic star capture processes by the galactic supermassive black hole, Sgr A*, with a capture rate 3 x 10(-5) yr(-1) and energy release similar to 3 x 10(52) erg per capture can produce very hot plasma similar to 10 keV with a wind velocity similar to 10(8) cm s(-1) injected into the halo and heat up the halo gas to similar to 1 keV, which produces thermal X-rays. The periodic injection of hot plasma can produce shocks in the halo and accelerate electrons to similar to TeV, which produce radio emission via synchrotron radiation and gamma rays via inverse Compton scattering with the relic and the galactic soft photons.