Journal
PHYSICAL REVIEW LETTERS
Volume 107, Issue 9, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.107.091101
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Funding
- STFC [PP/C506205/1, ST/J000507/1] Funding Source: UKRI
- Science and Technology Facilities Council [PP/C506205/1, ST/J000507/1] Funding Source: researchfish
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Gamma-ray data from Fermi Large Area Telescope reveal a bilobular structure extending up to similar to 50 degrees 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 Fermi acceleration by plasma wave turbulence through the entire volume of the bubbles. The observed gamma-ray spectral shape is then explained naturally by the resulting hard electron spectrum modulated by inverse-Compton energy losses. Rather than a constant volume emissivity as in other models, we predict a nearly constant surface brightness, and reproduce the observed sharp edges of the bubbles.
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