Table A.1.
Alternative profile models attempted in each region.
| Velocity | Added or | Stable? | Δ(Δα/α) | Δχ2 | Δ(AICC) |
|---|---|---|---|---|---|
| (km s−1) | removed? | (ppm) | |||
| Right region | |||||
| −38 | + | Yes | −0.24 | −8.8 | −0.1 |
| −24 | +a | Yes | 0.02 | 4.3 | 6.5 |
| −3 | − | Yes | −2.28 | 53.4 | 31.5 |
| 6 | − | No | |||
| 14 | + | Yes | 0.26 | −0.7 | 12.4 |
| 16 | − | No | |||
| 18 | + | Yes | 0.31 | −0.8 | 7.9 |
| 29 | + | Yes | −0.15 | 0.0 | 11.0 |
| 52 | − | No | |||
| 55 | − | No | |||
| 60 | − | Yes | 0.04 | 15.7 | 4.7 |
| 76 | − | Yes | 0.42 | 15.7 | 0.4 |
| Central region | |||||
| −321 | − | Yes | 0.70 | 11.9 | 5.5 |
| −244 | − | Yes | 0.07 | 2.6 | 2.6 |
| −238 | − | No | |||
| −232 | − | Yes | 5.06 | 15.9 | 5.1 |
| −219 | + | Yes | −1.26 | −9.3 | 5.8 |
| −218 | − | Yes | −0.11 | 10.7 | 8.7 |
| −179 | − | No | |||
| −127 | − | Yes | −2.00 | 2.1 | −6.6 |
| −123 | − | No | |||
| Left region | |||||
| −543 | − | Yes | 0.02 | 10.4 | 3.8 |
| −536 | − | Yes | −0.37 | 23.6 | 12.5 |
| −523 | − | Yes | −0.20 | 9.6 | −1.4 |
| −513 | − | Yes | 0.10 | 20.0 | 6.8 |
| −507 | − | Yes | −0.07 | 12.8 | 1.8 |
| −492 | − | Yes | 1.80 | 5.2 | −10.2 |
| −467 | − | No | |||
| −416 | − | Yes | −2.99 | 87.1 | 76.1 |
| −391 | − | Yes | 1.58 | 10.2 | 3.6 |
Notes. The velocity at which a component was added (+) or removed (−) is measured relative to the absorption redshift, zabs = 1.150793. A model is deemed unstable if VPFIT rejected important components in one species that were relatively strong in other species. For stable fits, the final two columns provide the change in Δα/α and the Akaike information criterion, corrected for finite sample sizes, AICC, relative to the fiducial model in Figs. 4, 8, and 9.
The component at −24 km s−1 was only added to Fe II as it already exists in Mg I/II in the fiducial model (see Fig. 4). While this model is listed as stable here, this additional Fe II component’s column density slowly reduces over repeated runs of VPFIT, with χ2 barely changing, and it is rejected eventually.
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