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Table 10.
Metal abundance ratios of absorption systems.
| Quasar | zabs | [Si/O] | [C/O] |
|---|---|---|---|
| ULAS J1342+0928 | 7.3680 ( † ) | 0.98 ± 0.10 | < –0.17 ± 0.11 |
| ULAS J1342+0928 | 7.4430 | 0.43 ± 0.24 | 0.19 ± 0.15 |
| VDES J0020–3653 | 6.4535 | 0.15 ± 0.16 | –0.13 ± 0.08 |
| VDES J0020–3653 | 6.5625 ( † ) | 0.64 ± 0.11 | < –0.26 |
| VDES J0020–3653 | 6.6690 | 0.49 ± 0.11 | –0.02 ± 0.07 |
| UHS J0439+1634 | 6.2880 ( † ) | 0.73 ± 0.06 | < –0.07 ± 0.06 |
Notes. ( † )Upper limits for [C/O] are computed because the column densities of carbon lines are overestimated due to line contamination from other systems, or an upper detection limit on C II in the case of the z = 6.5625 system.
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