Panel a: SUMSS 843 MHz continuum emission from Kes 41, the beam size is ~43′′ × 59′′ and the noise level is ~0.015 Jy beam−1. A linear intensity scale was used for the representation. Panel b: integrated radio spectrum of SNR Kes 41 constructedwith the flux densities measurements reported in Table 2. The solid line corresponds to the weighted linear fit to the points excluding the point at 80 MHz, which yields a global spectral index α = − 0.54 ± 0.10 (Sν ∝ να). The same spectral index with an optical depth at 80 MHz τ80MHz = 1.13 ± 0.37 is obtained by fitting (dotted line) all of the measurements with a low-frequency turnover in the spectrum around 100 MHz.
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