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Table 1.
Average offsets in log10(Line ratio) at different redshifts with respect to the average relation at redshift 0–0.4, determined at 12 + log10(O/H) = 8 and applicable in the given 12 + log10(O/H) range.
| Line ratio | 12 + log10(O/H) range | z = 1 | z = 1.5 | z = 2 | z = 2.5 |
|---|---|---|---|---|---|
| N2 | 7.5–8.7 | −0.15 ± 0.32 | −0.28 ± 0.34 | −0.38 ± 0.38 | −0.46 ± 0.38 |
| S2 | 7.5–8.7 | −0.34 ± 0.28 | −0.56 ± 0.26 | −0.74 ± 0.25 | −0.87 ± 0.24 |
| N2S2 | 8 | 0.19 ± 0.29 | 0.28 ± 0.31 | 0.36 ± 0.34 | 0.41 ± 0.34 |
| N2O2 | – | 0.04 ± 0.27 | 0.04 ± 0.31 | 0.06 ± 0.35 | 0.06 ± 0.36 |
| R2 | 7.5–8.5 | −0.18 ± 0.19 | −0.32 ± 0.18 | −0.44 ± 0.16 | −0.52 ± 0.15 |
| R3 | 7.5–8.5 | 0.17 ± 0.17 | 0.26 ± 0.16 | 0.32 ± 0.16 | 0.37 ± 0.15 |
| R23 | 7–8.5 | 0.05 ± 0.05 | 0.09 ± 0.05 | 0.13 ± 0.05 | 0.16 ± 0.06 |
| RS23 | 7.5–8.5 | 0.16 ± 0.16 | 0.24 ± 0.14 | 0.3 ± 0.14 | 0.35 ± 0.13 |
| O32 | 7.5–8.5 | 0.35 ± 0.35 | 0.58 ± 0.33 | 0.76 ± 0.31 | 0.89 ± 0.3 |
| O3N2 | 7–8 | 0.31 ± 0.44 | 0.53 ± 0.44 | 0.7 ± 0.46 | 0.83 ± 0.46 |
| O3S2 | 7–8.7 | 0.50 ± 0.42 | 0.82 ± 0.39 | 1.06 ± 0.38 | 1.24 ± 0.36 |
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