Open Access
Table 1.
Sample of strong proximate H2 absorbers in SDSS.
| RA | Dec | MJD-plate-fiber (a) | zH2 | log N(H I) | log N(H2) (b) | AV(c) | FLy − α | fleak(d) | Flag (e) |
|---|---|---|---|---|---|---|---|---|---|
| (J2000) | (J2000) | (cm−2) | (cm−2) | (mag) | (10−17 erg s−1 cm−2) | ||||
| 00:15:14.82 | 18:42:12.34 | 56270-06111-0908 | 2.628 | 20.85 | 19.8 | 0.09 | 49.7 ± 1.9 | 0.19 | 3 A |
| 00:19:30.55 | −01:37:08.46 | 55536-04366-0874 | 2.529 | 21.00 | 20.0 | 0.03 | 4.5 ± 1.9 | 0.02 | 3 A |
| 00:46:05.89 | 00:43:27.81 | 55444-04222-0981 | 2.940 | 20.00 | 19.3 | 0.10 | −0.4 ± 0.8 | 0.00 | 0 A |
| 00:59:17.64 | 11:24:07.70 | 56165-05706-0118 | 3.034 | 21.75 | 19.0 | 0.07 | 12.4 ± 2.4 | 0.04 | 1 A |
| 01:02:11.89 | 02:52:07.18 | 57281-07858-0826 | 2.657 | 20.80 | 19.5 | −0.00 | −0.5 ± 1.5 | 0.00 | 0 A |
| 01:25:55.11 | −01:29:25.00 | 56898-07877-0966 | 2.665 | 21.75 | 20.2 | 0.17 | 70.0 ± 5.0 | 0.27 | 2 A |
| 01:26:54.45 | 11:38:23.29 | 55831-04669-0080 | 2.603 | 20.50 | 19.2 | 0.04 | 21.3 ± 1.3 | 0.07 | 3 A |
| 01:36:44.02 | 04:40:39.10 | 55508-04274-0691 | 2.779 | 20.75 | 19.5 | −0.04 | 1.6 ± 1.3 | 0.01 | 3 A |
| 02:16:02.33 | 04:13:57.35 | 55486-04266-0012 | 2.661 | 20.55 | 19.7 | −0.34 | 16.3 ± 1.4 | 0.12 | 3 A |
| 02:19:26.55 | −01:10:57.30 | 55478-04237-0364 | 2.812 | 20.00 | 19.0 | 0.42 | 7.9 ± 0.6 | 0.23 | 0 B |
| 02:23:16.90 | −03:07:21.42 | 56904-07832-0378 | 2.583 | 22.00 | 20.0 | 0.01 | 23.9 ± 3.6 | 0.08 | 3 A |
| 07:54:02.68 | 43:59:28.25 | 57067-08276-0092 | 2.948 | 21.40 | 19.5 | 0.22 | 71.6 ± 3.0 | 0.36 | 3 A |
| 07:56:34.69 | 11:23:30.35 | 55602-04511-0874 | 3.315 | 21.00 | 20.1 | −0.15 | 1.9 ± 1.7 | 0.03 | 3 A |
| 07:59:01.28 | 28:47:03.43 | 55535-04453-0850 | 2.822 | 21.30 | 19.5 | −0.03 | 15.6 ± 1.6 | 0.04 | 3 A |
| 08:03:51.64 | 50:03:17.65 | 56992-07317-0693 | 2.977 | 20.65 | 19.0 | 0.62 | 3.6 ± 1.0 | 0.03 | 0 A |
| 08:07:57.45 | 51:52:34.24 | 56741-07377-0768 | 3.124 | 21.00 | 19.3 | 0.11 | 8.8 ± 1.4 | 0.10 | 0 A |
| 08:16:14.21 | 03:58:19.77 | 55869-04763-0096 | 3.682 | 20.00 | 19.0 | −0.00 | 5.9 ± 1.4 | 0.08 | 3 B |
| 08:21:26.13 | 36:26:06.10 | 57449-08857-0340 | 2.597 | 21.30 | 19.3 | −0.01 | −4.0 ± 2.3 | 0.00 | 3 A |
| 08:55:02.19 | 42:09:37.16 | 57375-08296-0646 | 2.719 | 22.30 | 19.8 | −0.16 | −3.6 ± 3.8 | 0.00 | 3 A |
| 08:58:59.67 | 17:49:25.19 | 55913-05297-0566 | 2.625 | 20.40 | 19.8 | 0.05 | −0.5 ± 1.5 | 0.00 | 3 A |
| 09:11:46.70 | 41:10:48.00 | 55999-04603-0104 | 2.840 | 21.15 | 20.0 | −0.06 | 38.8 ± 2.2 | 0.12 | 3 A |
| 09:18:50.50 | 52:20:03.56 | 57039-07289-0121 | 3.230 | 21.35 | 20.0 | 0.25 | 1.6 ± 1.4 | 0.02 | 3 A |
| 09:47:38.40 | 06:38:00.16 | 55926-04873-0354 | 2.954 | 20.80 | 19.2 | −0.12 | 13.8 ± 1.4 | 0.23 | 0 A |
| 09:48:27.31 | 07:22:36.97 | 55926-04873-0684 | 2.671 | 21.40 | 20.0 | −0.01 | 10.8 ± 2.0 | 0.05 | 3 A |
| 09:55:49.68 | 60:57:41.34 | 56014-05719-0786 | 2.894 | 20.10 | 18.8 | 0.08 | 4.3 ± 1.2 | 0.05 | 1 B |
| 10:06:40.78 | 36:02:34.14 | 57453-08856-0500 | 3.210 | 21.20 | 19.1 | 0.25 | −2.5 ± 2.1 | −0.01 | 0 A |
| 10:08:52.61 | 47:55:52.51 | 56338-06663-0946 | 2.852 | 21.55 | 20.1 | −0.13 | −2.3 ± 2.7 | 0.00 | 3 A |
| 10:11:04.27 | 32:39:11.00 | 56329-06461-0750 | 2.540 | 21.35 | 19.8 | 0.08 | 0.6 ± 1.8 | 0.01 | 2 A |
| 10:14:04.96 | 27:23:11.48 | 56334-06470-0814 | 3.025 | 21.75 | 19.9 | 0.24 | 7.6 ± 2.5 | 0.07 | 2 B |
| 10:31:43.87 | 22:40:15.19 | 56298-06425-0304 | 2.516 | 21.50 | 20.1 | 0.09 | 10.3 ± 1.6 | 0.02 | 3 A |
| 10:45:02.97 | 15:02:11.36 | 56009-05350-0802 | 3.657 | 21.60 | 20.6 | 0.07 | 2.3 ± 1.8 | 0.03 | 3 A |
| 10:47:21.79 | 29:15:47.78 | 56356-06449-0618 | 2.978 | 20.65 | 19.5 | 0.14 | 0.6 ± 1.5 | 0.01 | 3 A |
| 10:52:51.23 | 18:09:15.66 | 56035-05887-0388 | 2.866 | 21.50 | 20.8 | 0.36 | 1.0 ± 2.1 | 0.01 | 3 A |
| 11:10:41.05 | 67:15:50.46 | 56741-07111-0732 | 3.343 | 20.60 | 19.2 | −0.03 | 3.4 ± 1.1 | 0.04 | 1 A |
| 11:11:03.78 | 33:16:14.09 | 56370-06440-0770 | 2.960 | 20.00 | 19.0 | 0.10 | 10.4 ± 1.0 | 0.20 | 0 B |
| 11:11:24.18 | 14:47:56.09 | 56017-05362-0176 | 3.049 | 21.70 | 19.1 | 0.05 | −1.8 ± 2.7 | 0.00 | 3 A |
| 11:22:14.56 | 42:19:58.69 | 56013-04686-0206 | 2.620 | 20.60 | 19.9 | −0.02 | 15.6 ± 1.3 | 0.12 | 3 A |
| 11:23:40.09 | 15:53:53.66 | 55986-05367-0926 | 3.392 | 21.20 | 19.6 | 0.27 | −0.2 ± 1.5 | 0.00 | 0 B |
| 11:31:55.38 | 08:12:39.18 | 55947-05374-0724 | 2.716 | 21.20 | 19.2 | 0.22 | 36.7 ± 1.2 | 0.44 | 0 B |
| 11:35:17.10 | 29:57:22.08 | 56342-06405-0832 | 2.694 | 21.40 | 19.3 | 0.08 | 4.5 ± 2.0 | 0.02 | 0 B |
| 11:44:10.88 | 47:34:51.98 | 56401-06678-0237 | 2.588 | 21.00 | 19.7 | 0.32 | 11.7 ± 2.6 | 0.08 | 2 A |
| 11:44:52.49 | 20:36:44.15 | 56309-06432-0648 | 3.118 | 21.05 | 19.0 | 0.09 | 0.9 ± 1.3 | 0.01 | 0 B |
| 11:45:52.44 | 49:51:14.26 | 56412-06684-0118 | 3.043 | 20.80 | 19.0 | 0.13 | 5.6 ± 1.2 | 0.04 | 0 A |
| 11:53:14.86 | 58:14:40.20 | 56658-07091-0724 | 2.663 | 21.00 | 20.0 | 0.77 | 0.0 ± 1.4 | 0.01 | 2 A |
| 12:00:51.84 | 14:08:31.46 | 56009-05387-0256 | 3.034 | 19.35 | 19.3 | 0.19 | 3.9 ± 0.5 | 0.16 | 3 B |
| 12:28:56.08 | 31:47:53.86 | 56364-06479-0390 | 2.544 | 20.55 | 19.5 | 0.02 | 2.7 ± 1.2 | 0.04 | 0 B |
| 12:36:02.11 | 00:10:24.54 | 55647-03848-0266 | 3.033 | 20.55 | 19.5 | −0.09 | −0.1 ± 1.4 | 0.00 | 3 A |
| 12:41:10.70 | 38:35:36.46 | 57424-08836-0360 | 2.950 | 20.80 | 19.3 | 0.14 | −2.2 ± 1.5 | −0.01 | 3 B |
| 12:42:01.74 | 20:06:25.54 | 56088-05855-0612 | 3.387 | 20.95 | 19.7 | 0.12 | 7.5 ± 1.4 | 0.06 | 3 A |
| 12:42:34.82 | 44:48:13.10 | 56365-06617-0748 | 2.872 | 21.40 | 18.9 | 0.21 | 36.9 ± 1.6 | 0.28 | 0 A |
| 12:45:27.17 | 32:21:36.08 | 56358-06482-0070 | 3.206 | 20.35 | 18.7 | 0.10 | 2.4 ± 0.9 | 0.04 | 0 B |
| 12:48:29.51 | 06:39:35.62 | 56016-04835-0844 | 2.530 | 20.55 | 19.8 | −0.07 | −1.2 ± 1.3 | 0.00 | 3 A |
| 12:59:17.31 | 03:09:22.51 | 55325-04005-0624 | 3.246 | 21.40 | 19.1 | −0.09 | 24.7 ± 2.1 | 0.03 | 3 A |
| 13:07:09.97 | 30:28:18.71 | 56362-06487-0380 | 3.594 | 21.35 | 19.8 | 0.13 | 22.9 ± 3.0 | 0.14 | 3 A |
| 13:11:29.11 | 22:25:52.58 | 56066-05992-0136 | 3.092 | 20.80 | 19.4 | 0.09 | −3.0 ± 1.5 | 0.00 | 3 A |
| 13:19:04.34 | 13:56:49.57 | 56003-05425-0142 | 3.253 | 20.65 | 18.9 | −0.01 | 4.2 ± 0.9 | 0.05 | 1 B |
| 13:26:18.07 | 25:58:51.56 | 56096-05996-0912 | 2.887 | 21.60 | 20.2 | 0.31 | −1.6 ± 2.4 | 0.00 | 3 A |
| 13:31:11.41 | 02:06:09.06 | 55622-04045-0836 | 2.922 | 21.30 | 19.6 | −0.01 | 34.9 ± 2.3 | 0.15 | 3 A |
| 13:36:50.63 | 25:13:28.32 | 56089-05999-0079 | 2.810 | 20.25 | 19.5 | 0.03 | 0.1 ± 0.8 | 0.01 | 0 B |
| 13:58:08.94 | 14:10:53.29 | 56014-05446-0139 | 2.892 | 21.20 | 19.4 | 0.02 | 4.1 ± 1.8 | 0.02 | 1 A |
| 13:59:35.08 | 09:00:51.36 | 55958-05447-0810 | 2.766 | 20.30 | 19.5 | 0.08 | 0.2 ± 1.7 | 0.01 | 0 A |
| 14:11:18.14 | 02:15:12.03 | 55634-04030-0564 | 2.969 | 20.10 | 19.2 | −0.02 | 1.0 ± 1.0 | 0.03 | 0 A |
| 14:17:45.90 | 36:21:27.46 | 55246-03859-0592 | 3.339 | 22.45 | 19.9 | 0.12 | 3.6 ± 2.1 | 0.02 | 3 A |
| 14:21:41.26 | 52:45:51.69 | 56799-07339-0068 | 2.653 | 21.45 | 19.6 | 0.40 | 5.8 ± 1.5 | 0.04 | 0 A |
| 14:30:42.90 | 05:49:07.95 | 55691-04860-0172 | 2.837 | 20.80 | 20.0 | 0.02 | 3.4 ± 1.9 | 0.05 | 3 A |
| 14:49:24.08 | 24:41:23.11 | 56067-06021-0794 | 3.293 | 20.80 | 19.0 | 0.17 | 1.0 ± 0.9 | 0.02 | 3 A |
| 15:04:50.99 | 30:22:45.32 | 55245-03876-0340 | 2.781 | 21.60 | 20.2 | 0.04 | 7.7 ± 1.7 | 0.06 | 3 A |
| 15:12:22.27 | 38:21:07.40 | 56066-05167-0082 | 2.977 | 21.65 | 19.3 | −0.09 | 4.9 ± 2.7 | 0.03 | 3 A |
| 15:15:04.52 | 14:48:23.19 | 56030-05486-0112 | 2.782 | 20.70 | 20.0 | 0.77 | 3.7 ± 1.4 | 0.08 | 2 B |
| 15:44:43.05 | 18:29:45.89 | 55352-03937-0212 | 3.166 | 21.45 | 19.4 | −0.18 | 15.5 ± 2.1 | 0.08 | 3 B |
| 15:46:20.43 | 42:44:51.62 | 56101-06042-0364 | 3.324 | 20.90 | 19.5 | −0.11 | 1.2 ± 1.4 | 0.02 | 3 A |
| 16:04:32.33 | 57:57:22.03 | 56448-06786-0724 | 2.867 | 20.65 | 19.0 | −0.15 | 0.0 ± 1.3 | 0.00 | 1 A |
| 16:06:38.54 | 33:34:32.98 | 55721-04965-0091 | 3.085 | 20.80 | 19.0 | 0.05 | −0.9 ± 1.2 | 0.00 | 3 A |
| 16:38:31.22 | 48:57:26.04 | 57186-08056-0154 | 2.757 | 20.30 | 19.8 | 0.22 | 17.0 ± 1.2 | 0.13 | 0 A |
| 16:41:04.00 | 43:33:56.06 | 56091-06031-0436 | 3.024 | 20.20 | 19.0 | 0.45 | −1.2 ± 1.0 | −0.03 | 0 B |
| 17:06:15.68 | 37:56:13.71 | 55836-04983-0122 | 2.831 | 21.65 | 20.1 | 0.19 | 16.3 ± 2.6 | 0.05 | 3 A |
| 21:58:28.89 | 24:04:35.77 | 57311-07640-0252 | 2.688 | 21.30 | 20.0 | 0.28 | 1.2 ± 1.8 | 0.00 | 3 A |
| 22:28:07.36 | −02:21:17.17 | 55857-04380-0296 | 2.770 | 20.85 | 19.5 | −0.08 | 8.8 ± 1.2 | 0.01 | 3 A |
| 22:55:06.64 | 19:49:10.14 | 56959-07609-0172 | 2.914 | 20.50 | 19.2 | 0.05 | −0.7 ± 1.1 | −0.01 | 0 B |
| 23:25:06.62 | 15:39:29.31 | 56267-06143-0586 | 2.615 | 21.70 | 20.0 | 0.02 | 3.8 ± 2.6 | 0.01 | 3 A |
| 23:36:07.16 | 22:53:25.83 | 56566-06519-0141 | 2.701 | 21.00 | 19.7 | 0.04 | 11.3 ± 1.6 | 0.08 | 3 A |
Notes.
(a)
Modified Julian Date, plate number and fibre number corresponding to the SDSS spectra used in this work.
(b)
H2 column densities values correspond to those used in the figures shown in the Appendix A. These should be considered as indicative only and require confirmation at higher spectral resolution (see Sect. 4.1).
(c)
Typical uncertainty of 0.12 mag from intrinsic quasar power-law variations (see Sect. 4.4).
(d)
Conservative uncertainty of about 0.3 dex (see Sect. 4.2).
(e)
The flag number corresponds to the selection (0: non-statistical systems described in Sect. 2.4), 1: systems belonging to 
; 2: systems belonging to 
; 3=1+2. The flag letter corresponds to the visual classification (grade A or B).
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