Table 1
Component structure, column densities, and Doppler parameters for the weakly ionised phase of the z = 2.304 absorber towards Q 0453-423.
| No | vrel [km s-1] | Ion A | log N(A) | b [km s-1] |
|
|
||||
| 1 | 42 | C ii | 13.73 ± 0.07 | 7.5 ± 0.3 |
| O i | 14.17 ± 0.01 | |||
| Mg ii | 12.75 ± 0.01 | |||
| Al ii | 11.48 ± 0.07 | |||
| Si ii | 12.88 ± 0.04 | |||
| Fe ii | 12.75 ± 0.01 | |||
| 2 | 52 | C ii | 13.83 ± 0.04 | 13.5 ± 0.5 |
| O i | 13.53 ± 0.06 | |||
| Mg ii | 12.95 ± 0.01 | |||
| Al ii | 11.83 ± 0.03 | |||
| Si ii | 12.99 ± 0.03 | |||
| Fe ii | 12.51 ± 0.02 | |||
| 3 | 84 | C ii | 13.32 ± 0.03 | 7.2 ± 0.3 |
| O i | 13.26 ± 0.03 | |||
| Mg ii | 12.42 ± 0.01 | |||
| Al ii | 11.32 ± 0.02 | |||
| Fe ii | 12.26 ± 0.02 | |||
| Si ii | 12.53 ± 0.01 | |||
| 4 | 105 | C ii | 13.40 ± 0.02 | 12.4 ± 0.5 |
| O i | 12.73 ± 0.10 | |||
| Mg ii | 12.33 ± 0.01 | |||
| Al ii | 11.33 ± 0.03 | |||
| Si ii | 12.44 ± 0.01 | |||
| Fe ii | 11.96 ± 0.05 | |||
|
|
||||
| 1 | 54 | Si iv | 12.25 ± 0.05 | 31.8 ± 4.5 |
| 107 | Si iv | 11.86 ± 0.08 | 19.1 ± 3.1 | |
| detection limit for Si iv is 11.8 | ||||
|
|
||||
| C iv | ≤12.1 | |||
| Al iii | ≤11.9 | |||
|
|
||||
| 1 | 57 | H i | 19.23 ± 0.00 | 34.4 ± 0.1 |
| 2 | 281 | H i | 14.58 ± 0.01 | 32.9 ± 0.3 |
Notes. The weakly ionised metal species have been fit simultaneously. Additionally, Mg ii and Fe ii have each been fit as a multiplet with fixed line centres from the simultaneous fitting. For hydrogen, Lyman α, β, γ, δ, ϵ, and ζ have been fit simultaneously. For silicon, only the Si iv λ1393 line has been fit, since the line is very weak but the column density is above the detection limit. The errors are provided by FITLYMAN.
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