Table 4.
Statistics of photometric redshift performance obtained for the KiDS-GAMA spectroscopic sample (extract).
| Parameter setup | Mean of δz = zph − zsp | Mean of δz/(1 + zsp) | St.dev. of δz/(1 + zsp) | SMADa of δz/(1 + zsp) |
|---|---|---|---|---|
| ugri GAaP magnitudes, BPZb | 1.34 × 10−2 | 1.17 × 10−2 | 0.0481 | 0.0317 |
| ugri GAaP magnitudes, DR3 ANNz2 overall solutionc | −2.03 × 10−3 | 8.61 × 10−4 | 0.0508 | 0.0345 |
| ugri GAaP magnitudes, GAMA-depth ANNz2 solution | −1.94 × 10−3 | −1.91 × 10−4 | 0.0328 | 0.0219 |
| ugri ISO magnitudes | −2.45 × 10−3 | −3.26 × 10−4 | 0.0360 | 0.0259 |
| ugri GAaP magnitudes + | ||||
| KiDS FLUX_APER_10_ugri | −1.98 × 10−3 | −2.71 × 10−4 | 0.0321 | 0.0214 |
| KiDS A, B linear semi-axes | −1.96 × 10−3 | −2.54 × 10−4 | 0.0318 | 0.0213 |
| KiDS six GAaP ugri colours | −2.13 × 10−3 | −3.99 × 10−4 | 0.0321 | 0.0210 |
| WISE W1, W2, W3 fluxes | −1.61 × 10−3 | −1.47 × 10−5 | 0.0312 | 0.0206 |
| VIKING zY JHKs fluxes | −1.58 × 10−3 | −2.22 × 10−5 | 0.0312 | 0.0202 |
| KiDS A, B + FLUX_APER_10_ugri | −1.71 × 10−3 | −1.16 × 10−4 | 0.0311 | 0.0209 |
| KiDS FLUX_APER_10_ugri + GAaP colours | −1.71 × 10−3 | −1.23 × 10−4 | 0.0313 | 0.0205 |
| KiDS A, B + GAaP colours | −1.59 × 10−3 | −7.61 × 10−5 | 0.0305 | 0.0204 |
| KiDS GAaP colours + VIKING fluxes | −1.72 × 10−3 | −1.53 × 10−4 | 0.0311 | 0.0199 |
| KiDS GAaP colours + WISE W1, W2, W3 fluxes | −1.50 × 10−3 | −9.24 × 10−6 | 0.0303 | 0.0198 |
| VIKING fluxes + WISE W1, W2, W3 fluxes | −1.18 × 10−3 | 2.47 × 10−4 | 0.0302 | 0.0197 |
| KiDS A, B + FLUX_APER_10_ugri + GAaP colours | −1.69 × 10−3 | −1.67 × 10−4 | 0.0304 | 0.0200 |
| KiDS GAaP colours + VIKING fluxes + WISE W1, W2, W3 fluxes | −1.32 × 10−3 | 7.55 × 10−5 | 0.0296 | 0.0191 |
| KiDS A, B + VIKING fluxes + WISE W1, W2, W3 fluxes | −1.29 × 10−3 | 7.42 × 10−5 | 0.0290 | 0.0188 |
| KiDS A, B + GAaP colours + VIKING fluxes + WISE W1, W2, W3 fluxes | −1.33 × 10−3 | 3.57 × 10−5 | 0.0288 | 0.0186 |
Notes. See Appendix C for the full table. All the experiments used the same training and test sets of 〈z〉 = 0.23; what was varied were the photometric parameters used for the photo-z derivation, as given in the first column. See text for details of the photometric parameters.
SMAD is the scaled median absolute deviation, converging to standard deviation for Gaussian distributions.
BPZ is independent of the training sets – the numbers are given for comparison (for the same GAMA test sample). These statistics are based on the KiDS pipeline solution.
ANNz2 overall KiDS-DR3 solution from Sect. 4.4 calculated for the same GAMA test set as in all the experiments of this table.
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