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Fig. 5

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Normalised radio flux density Sn(x) = S(v)/S, = xαexp(−x−21) measurements (coloured open circles) as a function of the normalised frequency x = v/v* for 17 SNRs spectra without low frequency turnover (see labels). This sample includes the spectra of G4.5+6.8 and G28.6-0.1 SNRs published in Castelletti et al. (2021), plus 15 new collected for this work. Extended lines show their power-law fit while dotted ones correspond to Eq. (2) with characteristic frequency, v* (asterisk symbol) assigned as an upper limit according to the lowest measured frequency vlow. This normalised form sorts SNRs spectra in increasing order accordingly to their slope from bottom α = −0.69 to top α = −0.32. The black asterisk symbol marks the characteristic frequency, v*, and highlights how the normalisation is done.

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