Fermi gamma-ray "bubbles" from stochastic acceleration of electrons.
Gamma-ray data from Fermi Large Area Telescope reveal a bilobular structure extending up to ∼50° above and below the Galactic Center. It has been argued that the gamma rays arise from hadronic interactions of high-energy cosmic rays which are advected out by a strong wind, or from inverse-Compton scattering of relativistic electrons accelerated at plasma shocks present in the bubbles. We explore the alternative possibility that the relativistic electrons are undergoing stochastic 2nd-order Fe...Expand abstract
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4 pages, 4 figures; REVTeX4-1; discussion amended and one figure
added; to appear in PRL