Table 1.
Differences between the mean redshifts reconstructed with different methods (direct calibration and de-biased zPDF) and ⟨z⟩true, divided by (1 + ⟨z⟩true).
| zmin | zmax | % kept | Ntrain | Direct | zPDF w/ | zPDF w/ |
|---|---|---|---|---|---|---|
| calib. | flat prior | photo-z prior | ||||
| [10−2] | [10−2] | [10−2] | ||||
| σzp < 0.3 | ||||||
| 0.10 | 0.30 | 79.80 | 1192.00 | 1.72 | 2.78 | 0.94 |
| 0.30 | 0.50 | 72.10 | 2156.00 | 0.64 | 0.33 | 0.36 |
| 0.50 | 0.70 | 55.60 | 1497.00 | −0.57 | −0.88 | −0.28 |
| 0.70 | 0.90 | 68.70 | 1822.00 | −0.65 | −1.38 | −0.89 |
| 0.90 | 1.20 | 62.00 | 892.00 | 0.10 | 0.29 | −0.22 |
| σzp < 0.6 | ||||||
| 0.10 | 0.30 | 96.60 | 1318.00 | 1.34 | 3.19 | −0.88 |
| 0.30 | 0.50 | 89.40 | 2321.00 | −0.56 | 0.48 | −0.40 |
| 0.50 | 0.70 | 80.80 | 1845.00 | −1.26 | −2.60 | −1.50 |
| 0.70 | 0.90 | 89.60 | 2094.00 | −0.34 | −1.75 | −0.79 |
| 0.90 | 1.20 | 81.70 | 1057.00 | 0.38 | 1.16 | −0.03 |
| σzp < 1.2 | ||||||
| 0.10 | 0.30 | 97.80 | 1326.00 | 1.37 | 3.50 | −1.01 |
| 0.30 | 0.50 | 93.90 | 2357.00 | −0.38 | 0.90 | −0.46 |
| 0.50 | 0.70 | 88.20 | 1886.00 | −0.92 | −2.42 | −1.63 |
| 0.70 | 0.90 | 93.70 | 2131.00 | −0.11 | −1.67 | −0.92 |
| 0.90 | 1.20 | 90.40 | 1116.00 | 1.66 | 2.67 | 0.43 |
Notes. The KiDS+VIKING-450 survey is split into five tomographic bins. We use VVDS/DEEP2 as the target sample and COSMOS as the training one. In the top part of the table, photo-z are selected with σzp < 0.3, while the bottom parts show a selection at σzp < 0.6 and σzp < 1.2. The fraction of galaxies kept after this selection is also shown (‘% kept’). We apply the same definition as Wright et al. (2020) to define the loss of photometric sources (their Eq. (1)), including shear weights.
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