Table A.4
Integrated flux densities compiled for the SNR G21.8−0.6, used to trace the spectrum presented in Fig. 3d.
| G21.8−0.6 (Kes 69) | ||
|---|---|---|
| Frequency | Scaled flux | Reference |
| [MHz] | density [Jy] | |
| 29.9 | 210 ± 40 * | Jones & Finlay (1974) |
| 30.9 | 170.6 ± 34.1 * | Kassim (1988) |
| 57.5 | 172.4 ± 34.5 | Kassim (1989b) |
| 74 | 169.0 ± 31.0 | This work (from VLSSr) |
| 83 | 208.8 ± 39.8 | Kovalenko et al. (1994a) |
| 88 | 194 ± 21 | This work (from GLEAM) |
| 111 | 177.2 ± 39.4 | Kovalenko et al. (1994a) |
| 118 | 166 ± 20 | This work (from GLEAM) |
| 155 | 143 ± 16 | This work (from GLEAM) |
| 200 | 116 ± 14 | This work (from GLEAM) |
| 330 | 121.4 ± 18.2 | Kassim (1992) |
| 408 | 73.0 ± 7.3 | Shaver & Goss (1970b) |
| 960 | 63.7 ± 6.1 | Trushkin (1998) |
| 1000 | 64.0 ± 9.6 † | Milne (1970) |
| 1414 | 47.9 ± 4.8 | Altenhoff et al. (1970) |
| 1660 | 41.5 ± 6.2 † | Milne (1969) |
| 2700 | 41.0 ± 8.2 † | Milne (1969) |
| 2700 | 31.7 ± 9.2 | Willis (1973) |
| 2700 | 42.1 ± 4.6 | Velusamy & Kundu (1974) |
| 2700 | 39.6 ± 7.9 | Milne & Dickel (1974) |
| 2700 | 38.5 ± 7.7 | Goss & Day (1970) |
| 3650 | 29.1 ± 2.9 | Trushkin (1998) |
| 3900 | 27.0 ± 2.9 | Trushkin (1998) |
| 4800 | 23.7 ± 1.3 | Sun et al. (2011) |
| 4875 | 26.7 ± 4.0 | Downes et al. (1980) |
| 5000 | 23.1 ± 4.6 | Kundu et al. (1974) |
| 5000 | 29.0 ± 5.8 | Milne & Dickel (1975) |
| 5000 | 27.1 ± 5.4 | Goss & Shaver (1970) |
Notes. (†)No correction factor to bring the original flux density measurement to the scale of Perley & Butler (2017) was applied because no information on the flux density calibrators was found in the original publication.
(*) No correction to Perley & Butler (2017) was applied because the measurement is out of the 50 MHz-50 GHz frequency range where their scale is valid.
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