Table 4.
Median absorption line strengths measured (W0 Å) in stacked spectra as a function of the average impact parameter (⟨b⟩).
| ⟨b⟩ (kpc) | W0 [Å] | S/N | W0 [Å] | S/N | W0 [Å] | S/N | W0 [Å] | S/N | W0 [Å] | S/N |
|---|---|---|---|---|---|---|---|---|---|---|
| c1 | c2 | c3 | c4 | c5 | c6 | c7 | c8 | c9 | c10 | c11 |
| Lyα 1215.7 | O I–Si III 1303.2 | C II 1334.5 | Si IV 1393.8 | Si IV 1402.8 | ||||||
| 0.0 | 3.54 ± 0.02 | 58 | 2.61 ± 0.15 | 17 | 2.31 ± 0.08 | 20 | 1.91 ± 0.01 | 18 | 1.40 ± 0.05 | 67 |
| 68.6 | 1.71 ± 0.13 | 14 | 0.97 ± 0.10 | 9 | 1.37 ± 0.02 | 4 | 0.28 ± 0.06 | 4 | 0.32 ± 0.06 | 15 |
| 113.5 | 0.75 ± 0.05 | 9 | 0.59 ± 0.07 | 8 | 0.54 ± 0.01 | 3 | 0.09 ± 0.04 | 2 | < 0.10 | < 2 |
| 146.2 | 1.08 ± 0.13 | 13 | < 0.26 | < 2 | 0.30 ± 0.09 | 2 | 0.13 ± 0.19 | 3 | 0.27 ± 0.31 | 5 |
| 172.8 | 0.46 ± 0.14 | 5 | < 0.39 | < 2 | 0.38 ± 0.10 | 3 | < 0.09 | < 2 | < 0.06 | < 2 |
| Si II 1526.7 | C IV 1548.2 | Fe II 1608.5 | Al II 1670.8 | Al III 1862.8 | ||||||
| 0.0 | 0.94 ± 0.02 | 18 | 2.87 ± 0.11 | 20 | 0.99 ± 0.01 | 6 | 1.13 ± 0.03 | 10 | 1.25 ± 0.01 | 8 |
| 68.6 | 0.35 ± 0.03 | 3 | 0.70 ± 0.04 | 13 | 0.18 ± 0.03 | 3 | 0.35 ± 0.03 | 4 | 0.31 ± 0.11 | 7 |
| 113.5 | 0.24 ± 0.09 | 2 | 0.27 ± 0.04 | 2 | < 0.03 | < 2 | 0.18 ± 0.03 | 3 | < 0.06 | < 2 |
| 146.2 | 0.36 ± 0.05 | 4 | 0.24 ± 0.02 | 3 | – | – | – | – | 0.40 ± 0.02 | 3 |
| 172.8 | 0.39 ± 0.04 | 4 | < 0.05 | < 2 | – | – | – | – | < 0.34 | < 2 |
Notes. Foreground–background (fg–bg) galaxy pairs split by their average impact parameters (⟨b⟩): 68.6 kpc (N = 60), 113.5 kpc (N = 62), 146.2 kpc (N = 60), and 172.8 kpc (N = 57). The errors on the equivalent width (W0) measurements correspond to 1σ confidence intervals based on a bootstrap analysis (see Sect. 4.1).
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