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Fig. 7.

image

Model Lγ–SFR relation for our scenarios 0, 1, and 2 (R = 1, 0.1, 5 kpc, left panel), and 0, 3, and 4 (vw = 400, 40, 4000 km s−1, right panel). Scenarios with both Kolmogorov (solid lines) and Bohm (dashed lines) diffusion prescriptions are shown. The black dotted line delineates the genuine calorimetric limit given by Eq. (18) (see text), whereas the grey dot-dashed line represents all the luminosity available in relativistic protons for each SFR. The grey shaded band indicates the 1σ confidence region of the fit to the BF sample (see Sect. 2).

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