Table 3
Component high-ion ratios: PDLA vs. averages in other galaxy-halo environments.
| Component (velocity) |
a
|
|
|
|
|
|||
| C1 (−57 km s-1) | >11.5 | 0.08 ± 0.03 | <0.049 |
| C2 ( − 12 km s-1) | 1.54 ± 0.17 | 1.4 ± 1.0 | <0.194 |
| C3 (17 km s-1) | 0.65 ± 0.25 | >0.25 | ... |
| C4 (55 km s-1) | 2.64 ± 0.07 | >0.56 | ... |
| C5 (102 km s-1) | >3.4 | >0.06 | ... |
| PDLA averageb | 1.95 ± 0.09 | 0.35 ± 0.02 | <0.042 |
|
|
|||
| DLA averagec | 5.37 ± 2.20 | 0.56 ± 0.28 | <0.046 |
| Milky Way disk averaged | 3.3 ± 2.5 | 0.60 ± 0.47 | 0.12 ± 0.07 |
| Milky Way halo averagee | 4.19 ± 1.47 | 0.71 ± 0.36 | 0.14 ± 0.04 |
| LMC averagef | 1.5–2.5 | < 0.09–0.59 | < 0.33 |
Notes.
Component ratios derived from VPFIT columns, with limits given for components with Si iv and N v non-detections, or potential O vi blending.
PDLA average ratios derived from AOD integrations. The C iv/Si iv ratio is measured over the full interval − 100 to 120 km s-1. The C iv/O vi and N v/O vi ratios are measured over the (unblended) velocity interval − 100 to 0 km s-1.
Average and standard deviation of ratio among 12 DLAs with O vi absorption at z = 2–3 (Fox et al. 2007a). The N v/O vi average is an upper limit since N v is only detected in 3 of these 12 DLAs.
Taken from Lehner et al. (2011). Based on measurements made along 38 Galactic disk sight lines.
Taken from Wakker et al. (2011). Based on measurements made along 58 extragalactic sight lines.
Range observed in four LMC sightlines (not including H ii regions; Lehner & Howk 2007).
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