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Table 4

Column densities.

Component a b c d c+d Total
z 2.42693 2.42720 2.42743 2.42759
v (km s-1) −43 −20 0a 14
bb (km s-1) 16 13 7 16
Epoch Ion (level) log N ±  σlog Nc
Al iii  <12.76  <12.62  <12.21  <12.74  <12.85
Si i [λ1562] d  <12.68  <12.64  <12.53  <12.68  <12.68  <12.99
Si ii  <13.18  <13.15  <13.18
I Fe ii (  6D9/2)  <13.58 14.15 ± 0.07 13.63 ± 0.14 14.42 ± 0.06
Fe iii (  5D4)  <14.15  <13.98  <13.85  <14.08  <14.28
Fe iii*e (  5D3) [λ1124]   <14.16  <14.12  <13.98  <14.17  <14.17  <14.44
Fe iii17* (  7S3)  <12.38 12.62 ± 0.10
C ii  <13.06  ≥f14.08  <13.24  ≥14.14  ≥14.22
C ii* [λ1335]   <13.20  <13.16  <13.03  <13.21  <13.20  <13.51
O i  <13.75  <14.40g  <13.59  <13.75  <13.98  <14.60
O i* [λ1304]   <13.68  <13.64  <13.51  <13.68  <13.68  <13.98
Si ii  ≥f13.23  ≥13.30  ≥13.47
Si ii*  <12.41 12.58 ± 0.12
Cr ii  <12.84  <12.70  <12.85  <13.08
II Fe ii (  6D9/2) 14.10 ± 0.04 13.51 ± 0.06 14.34 ± 0.03
Fe ii* (  6D7/2) 13.01 ± 0.10 13.91 ± 0.04
Fe ii** (  6D5/2) 13.43 ± 0.04 13.67 ± 0.04
Fe ii*** (  6D3/2) 12.54 12.84 ± 0.06
Fe ii**** (  6D1/2)  <12.60
Fe ii***** (  4F9/2) [λ2348]   <13.19  <13.15  <13.03  <13.19  <13.21  <13.56
Fe iii (  5D4)  <13.79  <13.76  <13.62
Fe iii* (  5D3) [λ1124]   <13.94  <13.89  <13.79  <13.94  <13.93  <14.21
Ni ii [λ1370]   <13.55  <13.53  <13.40  <13.56  <13.56  <13.86
Zn ii [λ2026]   <12.09  <12.06  <11.93  <12.09  <12.09  <12.41
Al iii  <12.40  <12.42 12.45 ± 0.18  <12.60
Si i [λ1562]   <12.42  <12.38  <12.25  <12.42  <12.42  <12.73
Si ii  <13.06  <12.88  <13.02
III Fe ii (  6D9/2) 14.28 ± 0.05
Fe iii (  5D4)  <13.64 14.14 ± 0.15 14.50 ± 0.11
Fe iii* (  5D3) [λ1124]   <13.80  <13.77  <13.64  <13.81  <13.81  <14.09
Fe iii17* (  7S3)  <12.27 12.79 ± 0.05 13.18 ± 0.05 13.48 ± 0.03
C ii  <12.96  ≥f14.08  <12.85  ≥14.10  ≥14.14
C ii* [λ1335]   <12.89  <12.87  <12.72  <12.90  <12.90  <13.22
O i  <13.44  <14.10g  <13.29  <13.44  <13.67  <14.30
O i* [λ1304]   <13.36  <13.32  <13.19  <13.36  <13.36  <13.67
Si ii  <12.41  ≥f13.03  ≥13.20  ≥13.29
Si ii*  <12.03
Cr ii  <12.62  <12.59  <12.47  <12.62  <12.61  <12.93
IV Fe ii (  6D9/2)
Fe ii* (  6D7/2) 12.56 13.53 ± 0.09
Fe ii** (  6D5/2)  <12.02  <12.57  <12.68
Fe ii*** (  6D3/2)  <12.23  <12.28  <12.56
Fe ii**** (  6D1/2)  <12.29
Fe ii***** (  4F9/2) [λ2348]   <12.97  <12.93  <12.81  <12.97  <12.97  <13.31
Fe iii (  5D4) 13.78 ± 0.17 14.44 ± 0.09
Fe iii* (  5D3) [λ1124]   <13.69  <13.65  <13.55  <13.69  <13.69  <13.95
Ni ii [λ1370]   <13.23  <13.21  <13.06  <13.24  <13.24  <13.55
Zn ii [λ2026]   <11.86  <11.83  <11.69  <11.86  <11.86  <12.19

Notes. 

(a)

We adopt z = 2.42743 as our zero-velocity reference point.

(b)

Purely turbulent broadening.

(c)

Logarithm of the ion column density and 1σ error estimate or 3σ upper limit. The detection criteria for each component are: i) detection in at least both best-fit and upper continua; ii) the column density is larger than the 3σ detection limit; iii) its total error .

(d)

Square brackets indicate the transitions used to measure the 3σ upper limits.

(e)

The number of *’s indicates the excited energy level above the ground-state, either fine-structures of the ground-term or higher excited levels.

(f)

Conservative limits to account for any possible underestimate of Si ii and C ii in component “c” in case of a low b-value.

(g)

Upper limit derived from deblending, see Sect. 3.2.3.

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