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Table 2.

Properties of the absorbers along the QSO1 and QSO2 sight-lines.

IDabs(a) ABS1 (b) (m) ABS1-2C IV ABS2 (l) ABS2 (l) ABS3 (h) (g) ABS3 (h) (g)
IDs − l(c) QSO1 QSO1 QSO1 QSO2 QSO1 QSO2
H I zabs 3.005 ± 0.001 2.99833 ± 0.00026 2.99901 ± 0.00026 2.98097 ± 0.00021 2.97952 ± 0.00021
1215.670 log (N/[cm−2]) 15−17 14.6 ± 0.2 14.1 ± 0.1 15−17 15−17
b [km s−1] 200−100 50 (d) 50 (d) 200−100 200−100

N V(g) zabs 3.00560 ± 0.00015
1242.804 log (N/[cm−2]) >15.5 <14.2 <14.2 <14.7 <14.7
(1238.821) EW0(e) [Å] 6.14 ± 0.43 (4.5 ± 0.48) <0.37 <0.37 <1.1 <1.1
σ0(e) [Å] 0.89 ± 0.04

C IV(g) zabs 3.00731 ± 0.00005 3.00412 ± 0.00010 2.97967 ± 0.00013
1550.770 log (N/[cm−2]) >14.9 >14.5 <14.1 <14.1 <14.1 >14.7
(1548.195) EW0(e) [Å] 3.02 ± 0.27 (2.89 ± 0.33) 1.30 ± 0.26 (0.94 ± 0.24) <0.53 <0.53 <0.47 1.99 ± 0.36 (1.09 ± 0.33)
σ0(e) [Å] 0.39 ± 0.02 0.30 ± 0.05 0.38 ± 0.05

C II log (N/[cm−2]) <14.3 <14.3 <14.3 <14.2 <14.3
1334.532 EW0(e) [Å] <0.4 (f) <0.4 (f) <0.4 (f) <0.3 (f) <0.4 (f)

Si II log (N/[cm−2]) <13.2 <13.2 <13.2 <13.0 <13.2
1260.422 EW0(e) [Å] <0.24 (f) <0.24 (f) <0.24 (f) <0.18 (f) <0.24 (f)

Notes.

(a)

For each absorber we report in brackets its color for the vertical dotted lines in Figs. 6 and 7: (m) is magenta, (l) is lime, (g) is gray.

(b)

An alternative better fit (χ2 = 3.6 vs χ2 ∼ 9 for the presented values) of the H I absorption of this system could be done by fixing the Doppler b parameter to 50 km s−1. However, this alternative fit has a higher logNH I = 19.34 which seems to be disfavored by the absence of low-ion transitions associated with this absorber and by the absence of a clear Lyman limit break (Sect. 4.2).

(c)

This ID indicates the sight-line (s-l) on which the absorber is observed.

(d)

For this fit, the Doppler b parameter is fixed to a value that is usually found in IGM and CGM absorbers (e.g., Meiksin 2009; Lau et al. 2016).

(e)

Rest frame equivalent width EW0 and rest frame σ values.

(f)

3σ upper limit from which we estimate the upper limit in column density assuming the linear part of the curve of growth.

(g)

In brackets we report the data for the line of the doublet at shorter wavelengths.

(h)

The values logNH I = 15−17 are favored by the absence of low-ion transitions and the absence of a clear Lyman limit break (Sect. 4.2).

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