Table 2.
WSCLEAN parameters used for the initial high-resolution imaging and the forced-spectrum method, which produces the final model of Cyg A.
| Parameter | High resolution | Forced spectrum |
|---|---|---|
| Image size | 1024 × 1024 | 256 × 256 |
| Pixel scale | 0.25 arcsec | 1 arcsec |
| Weighting | Briggs −2 | Briggs −2 |
| Gridder | W-gridder | W-gridder |
| Minor gain | 0.01 | 0.01 |
| Major gain | 0.8 | 0.8 |
| Spatial mask | – | 1 Jy/beam [–] |
| Auto-mask (a) | 5σ | 3σ [6σ] |
| Auto-threshold (b) | 1σ | 1σ |
| MS scales (arcsec) | 0–80 | 0–99 (default) |
| MS gain (c) | 0.2 | 0.05 |
| Output channels | 100 (joined) | 41 (joined) |
| Spectral fitting | – | Log. pol. n = 3 [–] |
| uv-range (kλ) | – | 0.16 − 45.5 |
| Beam size | 3 arcsec | 5 arcsec |
Notes. Most of the parameters from the forced-spectrum method were also applied when generating the images used to extract the spectral index and curvature maps. The specific parameters for this imaging process are provided in square brackets.
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