Fig. 13
Fermi-LAT upper limits and theoretical expectations on the spectral energy density deduced from models of the Orion Nebula for realistic parameters: the turbulence index is ν = 3/2, magnetic turbulence is δB/B = 0.1, and electron-to-proton ratio is set to Kep = 10-2. The magnetic field is 100 μG. The red dashed line represents the sensitivity of CTA (5σ detection in 50 h; Becherini et al. 2012).
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