Astronomy and Astrophysics – Astrophysics – High Energy Astrophysical Phenomena
Scientific paper
2011-09-28
Astronomy and Astrophysics
Astrophysics
High Energy Astrophysical Phenomena
2011 Fermi Symposium proceedings - eConf C110509
Scientific paper
Fermi has discovered two giant gamma-ray-emitting bubbles that extend nearly 10 kpc in diameter. We propose that periodic star capture processes by the galactic supermassive black hole, Sgr A*, with a capture rate $<10^{-5}$ yr$^{-1}$ and energy release $\sim 10^{52}$ erg per one capture can produce shocks in the halo, which accelerate electrons to the energy ~ 1 TeV. These electrons generate radio emission via synchrotron radiation, and gamma-rays via inverse Compton scattering with the relic and the galactic soft photons. Estimates of the diffusion coefficient from the observed gamma-ray flux explains consistently the necessary maximum energy of electrons and sharp edges of the bubble.
Cheng Kwong Sang
Chernyshov D. O.
Dogiel Vladimir A.
Huen Ip Wing
Ko Che Ming
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