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Table A.1

Radio continuum spectral parameters for the SNR sample used in this work.

SNR α ν0 [MHz] τ0 ν1 [MHz] S 1 [Jy] ν∗ [MHz] S ∗ [Jy]
G18.8+0.3 (Kes 67) −0.373 74 0.043 74 79.75 16.54 139.46
G21.8−0.6 (Kes 69) −0.505 74 0.088 74 208.00 23.26 373.16
G23.3−0.3 (W41) −0.628 74 1.214 74 347.20 81.16 327.62
G27.4+0.0 (Kes 73) −0.690 74 0.878 74 34.72 69.55 36.24
G29.7−0.3 (Kes 75) −0.659 74 0.176 74 50.87 32.36 87.74
G31.9+0.0 (3C 391) −0.521 74 1.210 74 90.70 81.03 86.51
G39.2−0.3 (3C 396) −0.351 74 0.063 74 41.65 19.84 66.11
G41.1−0.3 (3C 397) −0.356 74 0.141 74 75.30 29.11 104.96
G43.3−0.2 (W49B) −0.461 74 0.580 74 111.80 57.09 125.96
G189.1+3.0 (IC 443) −0.388 74 0.016 74 436.90 10.24 941.26
G290.1−0.8 (MSH 11−61A) −0.421 74 0.258 74 137.80 38.82 180.80
G316.3+0.0 −0.893 74 0.215 74 166.20 35.59 319.52

G0.9+0.1 −0.64 100 0.820 2000 6.9 90.98 49.86
G1.05−0.1 −0.66 100 2.000 1700 13.0 139.10 67.83
G6.4−0.1 (W28) −0.42 100 0.080 450 440.0 30.04 1371.00
G8.7−0.1 (W30) −0.48 100 0.150 940 80.0 40.52 361.80
G9.8+0.6 −0.56 100 0.670 740 4.1 82.64 13.99
G11.2−0.3 −0.49 100 0.240 6000 9.2 50.68 95.43
G11.4−0.1 −0.46 100 0.430 1000 6.0 66.91 20.82
G15.9+0.2 −0.63 100 0.160 1100 4.2 41.78 32.97
G16.7+0.1 −0.53 100 0.530 960 2.9 73.91 11.29
G18.8+0.3 (Kes 67) −0.42 100 0.030 580 37.0 18.83 156.10
G20.0−0.2 −0.00 100 0.05 180 10.0 24.01 10.00
G21.8−0.6 (Kes 69) −0.50 100 0.050 600 77.0 24.01 384.90
G22.7−0.2 −0.40 100 0.560 1850 59.0 75.87 211.70
G23.3−0.3 (W41) −0.48 100 0.550 190 190.0 75.23 296.40
G24.7−0.6 −0.59 100 0.760 800 8.0 87.75 29.47
G24.7+0.6 −0.14 100 0.220 1600 18.0 48.63 29.36
G27.4+0.0 −0.71 100 0.380 560 9.4 63.08 44.30
G29.7−0.3 (Kes 75) −0.59 100 0.060 3100 4.4 26.19 73.56
G31.9+0.0 (3C 391) −0.51 100 0.520 2200 15.5 73.24 87.89
G39.2−0.3 (3C 396) −0.48 100 0.060 840 20.0 26.19 105.70
G39.7−2.0 (W50) −0.50 100 0.055 760 90.0 25.13 495.00
G40.5−0.5 −0.51 100 0.220 410 19.5 48.63 57.84
G41.1−0.3 (3C 397) −0.46 100 0.070 10000 7.0 28.19 104.30
G78.2+2.1 (γ-Cygni) −0.73 100 0.280 1480 40.0 54.54 2671.00
G82.2+5.3 (W63) −0.63 100 0.270 1900 73.0 53.61 691.10
G89.0+4.7 (HB21) −0.39 100 0.012 800 240.0 12.17 1228.00
G111.7−2.1 −0.75 100 0.010 180 11500.0 10.94 93922.52
G120.1+1.4 −0.62 100 0.010 520 86.0 11.16 930.89
G189.1.1−3.0 −0.42 100 0.010 700 190.0 11.16 1080.67
G205.5+0.5 (Monoceros) −0.47 100 0.080 1300 135.0 30.04 793.20
G206.9+2.3 (PKS 0646+06) −0.51 100 0.060 360 10.0 26.19 38.06

G6.4−0.1 (W28) −0.4 30.9 0.9 408 424.0 29.39 1214.00
G11.2−0.3 −0.5 30.9 2.1 408 30.0 43.99 91.36
G11.4−0.1 −0.4 30.9 3.7 408 7.1 57.61 15.53
G15.9+0.2 −0.7 30.9 2.1 408 8.5 43.99 40.41
G18.8+0.3 (Kes 67) −0.5 30.9 0.6 408 49.0 24.23 201.10
G21.8−0.6 (Kes 69) −0.5 30.9 0.9 408 95.0 29.39 354.00
G22.7−0.2 −0.2 30.9 3.5 408 65.0 56.11 96.66
G23.3−0.3 (W41) −0.4 30.9 7.2 408 119.0 79.11 229.40
G29.7−0.3 (Kes 75) −0.6 30.9 0.8 408 15.0 27.79 75.20
G39.2−0.3 (3C 396) −0.4 30.9 0.5 408 25.0 22.21 80.09
G40.5−0.5 −0.5 30.9 2.1 408 16.0 43.99 48.73
G41.1−0.3 (3C 397) −0.4 30.9 0.9 408 39.0 29.39 111.70
G43.3−0.2 (W49) −0.4 30.9 0.9 408 46.0 29.39 131.80
G355.9−2.5 −0.5 30.9 1.1 408 12.0 32.33 42.63

Notes. Each group of rows, separated by a horizontal line, corresponds to Castelletti et al. (2021) and this work data, Kovalenko et al. (1994b), and Kassim (1989) sample, respectively. Column 1 is the SNR identification name while columns 2 to 6 are published parameter for Eq. (1) taken from these references. For SNRs G189.1+3.0, G290.1–0.8, and G316.3+0.0, we derived the parameters through spectral fits to the datasets constructed for this study. Column 7 and 8 display our computed values for v* and S*, respectively, using and S* = S1(ν*/ν1)α (see Eq. 2).

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