Table 1.
Comparison between high-z empirical and local calibrations.
| High-z empirical | Local | Ionization | Relative | Solar | Dust | |
|---|---|---|---|---|---|---|
| calibration | calibration | correction | abundance | abundance | depletion | |
| log NH I − log NX, i | log NH I − log NX, i | nX, i/nX | [X/H] | log(nX/nH)⊙ | δX | |
| Na I | 7.5 ± 0.1 | 7.6 | 0.1 | 0 | −5.69 | −0.95 |
| Mg I | 7.8 ± 0.1 | (5.7, 6.7) | 0.1 | 0 | −4.38 | ( − 1.27, −0.27) |
| Mg II | 6.3 ± 0.2 | (4.7, 5.7) | 1 | 0 | −4.38 | ( − 1.27, −0.27) |
| Fe II | 5.8 ± 0.1 | (5.4, 6.7) | 1 | 0 | −4.46 | ( − 2.24, −0.95) |
Notes. The local calibration is based on Eq. (1). The last four columns list the assumptions used to derive the local calibration. Solar abundance and dust depletion values are taken from Savage & Sembach (1996) for Na and from Jenkins (2009) for Mg and Fe. Ionization corrections are from Rupke et al. (2005) for Na I and Murray et al. (2007) for Mg I.
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