Table 6.
The QSOC parameters used to compute the redshift score of quasars from Eq. (7) and the Zscore from Eq. (6).
| Parameters of the redshift score | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| w0 = 0.71413 | w1 = 0.28587 | p = 0.24365 | |||||||
| Parameters of the Zscore for BP spectra | |||||||||
| O IV | Lyα | Si IV | C IV | C III] | Mg II | Hγ | Hβ | ||
| λ [nm] | 103.202 | 121.896 | 139.349 | 154.658 | 189.957 | 279.259 | 437.904 | 491.899 | |
| Iλ | 0.017 | 1.0039 | 0.01 | 0.13202 | 0.31359 | 0.94396 | 0.23848 | 0.93124 | |
| Parameters of the Zscore for RP spectra | |||||||||
| O IV | Lyα | Si IV | C IV | C III] | Mg II | Hγ | Hβ | Hα | |
| λ [nm] | 103.353 | 122.388 | 139.563 | 154.588 | 190.398 | 280.470 | 435.600 | 488.952 | 657.736 |
| Iλ | 0.062484 | 0.10984 | 0.18982 | 0.07023 | 0.1409 | 0.22011 | 0.4101 | 0.25137 | 0.59948 |
Notes. The rest-frame wavelengths, λ, of each emission line were retrieved from the quasar templates described in Sect. 5.2.2. Theoretical emission line intensities, Iλ, and score parameters, w0, w1, and p, were computed based on a global optimisation procedure that is designed to maximise the score of the redshift predictions with |Δz|< 0.1 amongst 88 196 randomly selected sources with a redshift estimate from DR12Q. We note that another set of 89 839 observations was then kept as a test set, though the two sets provide a similar distribution of scores.
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