Table 7
Density and distance limits from timescale calculations
| Trough | v | log ne1 | R1 | log ne2 | R2 | log ne3 | R3 | ||||
| (km s-1) | (cm-3) | (pc) | (cm-3) | (pc) | (cm-3) | (pc) | |||||
|
|
|||||||||||
| T1 | –405 | < 2.4 | > 460 | < 3.9 | > 80 | 3.0–3.7 | 100–230 | ||||
| T2 | –310 | < 2.4 | > 400 | < 3.9 | > 70 | 2.9–3.1 | 180–230 | ||||
| T3 | –240 | < 2.3 | > 350 | < 3.7 | > 70 | < 2.7 | > 220 | ||||
| T4 | –70 | < 2.1 | > 400 | < 3.6 | > 70 | < 2.6 | > 230 | ||||
| T5 | –15 | < 2.4 | > 490 | < 3.8 | > 100 | < 3.6 | > 120 | ||||
| T6 | +45 | < 1.9 | > 430 | < 3.4 | > 80 | < 1.8 | > 480 | ||||
| T7 | +125 | < 1.4 | > 480 | < 2.9 | > 90 | < 1.9 | > 270 | ||||
Notes. Timescales are derived from C iv for all troughs except T1, for which we use N v. While troughs T1 and T2 show change, the limits on number density derived from timescale arguments are upper limits since photoionization models imply the absorbers are not in equilibrium.
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