Table C.1.
Statistics of photometric redshift performance obtained for the KiDS-GAMA spectroscopic sample.
| 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 mags, BPZb | 1.34 × 10−2 | 1.17 × 10−2 | 0.0481 | 0.0317 |
| ugri GAaP mags, DR3 ANNz2 overall solutionc | −2.03 × 10−3 | 8.61 × 10−4 | 0.0508 | 0.0345 |
| ugri GAaP mags, 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 AUTO magnitudes | −2.72 × 10−3 | −3.83 × 10−4 | 0.0384 | 0.0278 |
| ugri GAaP magnitudes + | ||||
| KiDS FLUX_APER_10_ugri | −1.98 × 10−3 | −2.71 × 10−4 | 0.0321 | 0.0214 |
| KiDS FLUX_APER_14_ugri | −1.97 × 10−3 | −2.49 × 10− | 0.0323 | 0.0214 |
| KiDS FLUX_APER_25_ugri | −2.00 × 10−3 | −2.84 × 10−4 | 0.0327 | 0.0214 |
| KiDS FLUX_APER_{4, ..., 100}_r | −1.85 × 10−3 | −1.91 × 10−4 | 0.0315 | 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 fluxes | −1.44 × 10−3 | 1.28 × 10−4 | 0.0314 | 0.0209 |
| WISE W1, W2 fluxes, observational errors usedd | −1.55 × 10−3 | 5.28 × 10−5 | 0.0313 | 0.0209 |
| WISE W1, W2, W3 fluxes | −1.61 × 10−3 | −1.47 × 10−5 | 0.0312 | 0.0206 |
| WISE W1, W2, W3 fluxes, observational errors usedd | −1.54 × 10−3 | 3.45 × 10−5 | 0.0311 | 0.0205 |
| VIKING zY JHKs fluxes | −1.58 × 10−3 | −2.22 × 10−5 | 0.0312 | 0.0202 |
| ugri GAaP magnitudes + | ||||
| KiDS A, B + FLUX_APER_10_ugri | −1.71 × 10−3 | −1.16 × 10−4 | 0.0311 | 0.0209 |
| KiDS FLUX_APER_{4, ..., 100}_r + GAaP colours | −1.74 × 10−3 | −1.75 × 10−4 | 0.0309 | 0.0206 |
| 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 A, B + WISE W1, W2 fluxes | −1.45 × 10−3 | 5.68 × 10−5 | 0.0303 | 0.0205 |
| KiDS GAaP colours + WISE W1, W2 fluxes | −1.60 × 10−3 | −6.87 × 10−5 | 0.0307 | 0.0202 |
| KiDS A, B + VIKING fluxes | −1.70 × 10−3 | −1.25 × 10−4 | 0.0307 | 0.0201 |
| KiDS A, B + WISE W1, W2, W3 fluxes | −1.43 × 10−3 | 4.33 × 10−5 | 0.0300 | 0.0200 |
| 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 |
| ugri GAaP magnitudes + | ||||
| KiDS A, B + FLUX_APER_{4, ..., 100}_r + GAaP colours | −1.73 × 10−3 | −1.93 × 10−4 | 0.0302 | 0.0201 |
| KiDS A, B + FLUX_APER_4_ugri + GAaP colours | −1.77 × 10−3 | −2.24 × 10−4 | 0.0303 | 0.0201 |
| KiDS A, B + FLUX_APER_10_ugri + GAaP colours | −1.69 × 10−3 | −1.67 × 10−4 | 0.0304 | 0.0200 |
| KiDS A, B + GAaP colours + VIKING fluxes | −1.59 × 10−3 | −1.07 × 10−4 | 0.0299 | 0.0194 |
| KiDS A, B + GAaP colours + WISE W1, W2, W3 fluxes | −1.59 × 10−3 | −1.24 × 10−4 | 0.0293 | 0.0192 |
| 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 |
| ugri GAaP magnitudes + | ||||
| KiDS A, B + GAaP colours + VIKING fluxes + WISE W1, W2, W3 fluxes | −1.33 × 10−3 | 3.57 × 10−5 | 0.0288 | 0.0186 |
| KiDS A, B + FLUX_APER_10_ugri + GAaP colours + VIKING fluxes | −1.75 × 10−3 | −2.46 × 10−4 | 0.0299 | 0.0195 |
| KiDS A, B + FLUX_APER_10_ugri + GAaP colours + WISE W1, W2, W3 fluxes | −1.61 × 10−3 | −1.68 × 10−4 | 0.0291 | 0.0190 |
| ugri GAaP magnitudes + | ||||
| KiDS A, B + FLUX_APER_10_ugri + GAaP colours + VIKING fluxes + WISE W1, W2, W3 fluxes | −1.56 × 10−3 | −1.48 × 10−4 | 0.0287 | 0.0186 |
Notes. 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.
Errors on all the input parameters were directly used in photo-z derivation instead of relying on the internal error model of ANNz2. See Sects. 2.1 and 5.2 for details.
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