Table 1
H I 21-cm absorption detections for different integrated optical depth limits.
| Optical depth cutoff (km s−1) | Number of sight lines(†) | Number of detections (‡) | Percentage (‡) |
|---|---|---|---|
| 0.02 | 71 | 63 (64) | 89 ± 11 (90 ± 11) |
| 0.05 | 320 | 268 (278) | 84 ± 5 (87 ± 5) |
| 0.1 | 629 | 476 (509) | 76 ± 4 (81 ± 4) |
| 0.2 | 1041 | 700 (777) | 67 ± 3 (75 ± 3) |
| 0.5 | 2249 | 1113 (1327) | 50 ± 2 (59 ± 2) |
| 1.0 | 4130 | 1497 (1900) | 36 ± 1 (46 ± 1) |
| 2.0 | 7191 | 1794 (2475) | 25.0 ± 0.6 (34.4 ± 0.7) |
| 5.0 | 12304 | 2001 (3010) | 16.3 ± 0.4 (24.5 ± 0.5) |
| 10.0 | 14762 | 2011 (3137) | 13.6 ± 0.3 (21.3 ± 0.4) |
| 20.0 | 15795 | 2011 (3149) | 12.7 ± 0.3 (19.9 ± 0.4) |
| 40.0 | 15994 | 2011 (3151) | 12.6 ± 0.3 (19.7 ± 0.4) |
Notes.(†) Number of sight lines with integrated 3σ optical depth sensitivity better than the optical depth cutoff. The integrated 3σ optical depth sensitivity is estimated as τ3σ × 6.1, where 6.1 km s−1 is the median line FWHM of absorption detections. (‡)Number and percentage of sight lines with peak S/N > 6 absorbers. The values in brackets are for absorbers with Vis_flag = True, regardless of the peak S/N.
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