Table 2
Statistics of NIKA images under various levels of smoothing.
| Source | λ | θ | Kernel | tobs | μ ± σ |
|---|---|---|---|---|---|
| (mm) | (′′) | (s pix−1) | (MJy sr−1) | ||
| SDC18 | 1.2 | 12.0 | – | 20.6 | − 0.10 ± 2.35 |
| 1.2 | 13.0 | G | 20.6 | 0.14 ± 1.57 | |
| 1.2 | 20.0 | P | 20.5 | 0.17 ± 1.15 | |
| 1.2 | 20.0 | G | 20.5 | 0.17 ± 1.16 | |
| 2.0 | 18.2 | – | 15.9 | 0.01 ± 0.29 | |
| 2.0 | 20.0 | G | 15.9 | 0.02 ± 0.20 | |
| SDC24 | 1.2 | 12.0 | – | 17.9 | − 0.03 ± 2.13 |
| 1.2 | 13.0 | G | 17.8 | 0.15 ± 1.01 | |
| 1.2 | 20.0 | P | 17.8 | 0.12 ± 0.62 | |
| 1.2 | 20.0 | G | 17.8 | 0.12 ± 0.60 | |
| 2.0 | 18.2 | – | 13.6 | 0.00 ± 0.28 | |
| 2.0 | 20.0 | G | 13.6 | 0.00 ± 0.09 |
Notes. Individual images are denoted by the approximate central wavelength λ in the corresponding waveband, with an effective resolution element of FWHM θ after smoothing. Smoothing using kernels denoted “G” are Gaussian, while those denoted “P” used the PSF-matching kernel described in Sect. 3.2, and where no kernel is listed, measurements of the raw (unsmoothed) data are presented. We also list the mean integration time, tobs per 2′′ pixel in the central 1.8′ in SDC18 and 1.2′ in SDC24 used to calculate the effective rms noise level σ and mean background level μ.
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