Table 6
Timescales per electron number density
| Trough | −fnet(C iv) | −fnet(N v) |
| (1010 cm-3 s) | (1010 cm-3 s) | |
|
|
||
| T1 | 18.3 | –5.15 |
| T2 | 8.92 | –5.59 |
| T3 | 3.82 | –9.86 |
| T4 | 2.76 | –14.5 |
| T5(low) | 13.8 | –4.81 |
| T6 | 1.60 | 10.2 |
| T7 | 0.51 | 2.35 |
Notes. The numbers in this table are the product of t ∗ from Eq. (10) and − fne. To get a timescale for a given ne and flux change f, we divide the number in the table by − fne. For example, given ne = 103 cm-3 (typical for the upper limits derived in Section 5) and f = 0.72 (the flux at the COS epoch minus that at the STIS epoch), t ∗ (C iv) ~ 1.7 yr for component T3. Note that the numbers in this table are positive or negative depending on whether the change in ionic fraction is anti-correlated or correlated with a drop in ionizing flux, respectively (see also Bottorff et al. 2000).
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.