Particle acceleration and the origin of gamma-ray emission from Fermi bubbles

D. O. Chernyshov, K. S. Cheng, V. A. Dogiel, C. M. Ko, W. H. Ip, Y. Wang

Research output: Contribution to conferencePaperpeer-review

2 Scopus citations


Fermi LAT has discovered two extended gamma-ray bubbles above and below the galactic plane. We propose that their origin is due to the permanent energy release in the Galactic center (GC) as a result of star accretion onto the central black hole. Shocks generated by these processes propagate into the Galactic halo and accelerate particles there. We show that electrons accelerated up to ∼ 10 TeV may be responsible for the observed gamma-ray emission of the bubbles as a result of inverse Compton (IC) scattering on the relic photons. We suggest that the Bubble could generate the flux of CR protons at energies > 1015 eV because the shocks in the Bubble have much larger length scales and longer lifetime in comparison with those in SNRs. This may explain the the CR spectrum above the knee.

Original languageEnglish
Number of pages4
StatePublished - 2011
Event32nd International Cosmic Ray Conference, ICRC 2011 - Beijing, China
Duration: 11 Aug 201118 Aug 2011


Conference32nd International Cosmic Ray Conference, ICRC 2011


  • Acceleration of particles
  • Galaxy: halo
  • Radiation mechanisms: non-thermal
  • Shock waves


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