Table 5
The temporal variations of the Fe I excited levels in vFe I Exc, heliocentric velocity (km s−1), bFe I Exc value (km s−1) and Log N column density (in Log cm−2, identified by the energy level in cm−1) evaluated by fitting simultaneously all excited levels absorption lines, epoch by epoch.
| Periods | 2003–2004 | 2004–2007 | 2007–2008 | 2008–2009 | 2009–2010 | 2010–2011 | 2013–2014 | 2014–2015 | 2015–2016 | 2016–2017 |
|---|---|---|---|---|---|---|---|---|---|---|
| Nb. Obs. | 215 | 42 | 198 | 417 | 54 | 207 | 453 | 60 | 190 | 1080 |
| vFe I Exc | 20.39 ± 0.03 | 20.37 ± 0.09 | 20.39 ± 0.08 | 20.45 ± 0.03 | 20.47 ± 0.14 | 20.33 ± 0.07 | 20.34 ± 0.08 | 20.85 ± 0.17 | 20.19 ± 0.15 | 20.18 ± 0.06 |
| bFe I Exc | 0.80 ± 0.10 | 0.78 ± 0.33 | 1.20 ± 0.20 | 0.98 ± 0.09 | 1.00 ± 0.53 | 1.22 ± 0.17 | 0.89 ± 0.29 | 1.47 ± 0.51 | 1.14 ± 0.54 | 1.00 (fixedb) |
| log NFeI 416a | 11.61 ± 0.02 | 11.55 ± 0.05 | 11.64 ± 0.03 | 11.60 ± 0.02 | 11.54 ± 0.07 | 11.65 ± 0.03 | 11.39 ± 0.04 | 11.54 ± 0.08 | 11.31 ± 0.08 | 11.45 ± 0.03 |
| log NFeI 704 | 11.25 ± 0.03 | 10.84 |
11.38 ± 0.05 | 11.40 ± 0.03 | 11.15 |
11.30 ± 0.08 | 11.09 ± 0.08 | 11.11 ± 0.15 | 10.84 |
11.16 ± 0.06 |
| log NFeI 888 | 11.01 ± 0.06 | 11.18 ± 0.08 | 10.69 |
10.88 ± 0.07 | <10.96 | 11.03 ± 0.10 | 10.81 |
10.86 |
10.73 |
10.74 |
| log NFeI 978 | 10.51 |
<10.47 | <10.10 | 10.45 |
10.73 |
<10.65 | 10.50 |
<10.65 | <10.06 | <9.91 |
| log NFeI 6928a | 10.92 ± 0.01 | 10.87 ± 0.04 | 10.88 ± 0.04 | 10.93 ± 0.02 | 10.90 ± 0.07 | 11.03 ± 0.03 | 10.60 ± 0.05 | 10.75 ± 0.08 | 10.67 ± 0.07 | 10.75 ± 0.03 |
| log NFeI 7377 | 10.47 ± 0.03 | 10.49 ± 0.08 | 10.45 ± 0.09 | 10.54 ± 0.03 | 10.51 |
10.45 ± 0.09 | 10.06 |
9.92 |
10.22 ± 0.20 | 10.34 ± 0.06 |
| log NFeI 7728 | <9.67 | <10.74 | 10.83 |
10.27 |
10.88 |
<10.41 | <9.80 | <10.23 | <10.40 | <9.93 |
| log NFeI 7986 | <9.90 | <9.98 | <10.14 | 9.87 |
<10.07 | 10.31 |
10.15 |
<9.67 | <10.02 | <9.10 |
| log NFeI 8155 | <8.90 | <10.15 | 9.95 |
10.18 |
<10.36 | <10.08 | <9.35 | <9.33 | 10.17 |
<9.63 |
| log NFeI 11976 | 9.68 |
9.56 |
9.59 |
9.61 |
9.55 |
9.82 ± 0.08 | 9.43 |
9.67 ± 0.13 | <9.11 | 9.49 ± 0.12 |
| log NFeI 12561 | 9.24 |
<8.39 | 9.15 |
9.35 |
<9.48 | 9.43 |
9.00 |
<9.18 | 9.14 |
9.12 |
| log NFeI 12969 | 9.12 |
9.27 |
9.35 |
9.28 |
<9.44 | 9.24 |
<8.47 | 9.28 |
<9.11 | 9.23 |
 |
11.93 ± 0.01 | 11.84 ± 0.04 | 11.96 ± 0.03 | 11.97 ± 0.02 | 11.87 ± 0.06 | 11.97 ± 0.03 | 11.73 ± 0.03 | 11.80 ± 0.06 | 11.61 ± 0.07 | 11.75 ± 0.03 |
Notes. The sum of the column density in all excited levels is given in the last line. (a) Individualizes the rows with the cleanest column density determination. Those are plotted as solid lines in Fig. 3. (b) The b-value was fixed at the median value from past measurements, because Owens.f was unable to converge on a realistic value.
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