2008A&A...481..327N


C.D.S. - SIMBAD4 rel 1.7 - 2019.07.18CEST14:08:03

2008A&A...481..327N - Astronomy and Astrophysics, volume 481, 327-336 (2008/4-2)

Molecular hydrogen in high-redshift damped Lyman-α systems: the VLT/UVES database.

NOTERDAEME P., LEDOUX C., PETITJEAN P. and SRIANAND R.

Abstract (from CDS):

We present the current status of ongoing searches for molecular hydrogen in high-redshift (1.8<zabs≤4.2) Damped Lyman-α systems (DLAs) capitalising on observations performed with the ESO Very Large Telescope (VLT) Ultraviolet and Visual Echelle Spectrograph (UVES). We identify 77 DLAs/strong sub-DLAs, with logN(HI)≥20 and zabs>1.8, which have data that include redshifted H2 Lyman and/or Werner-band absorption lines. This sample of HI, H2 and metal line measurements, performed in an homogeneous manner, is more than twice as large as our previous sample (Ledoux et al. 2003) considering every system in which searches for H2 could be completed so far, including all non-detections. H2 is detected in thirteen of the systems, which have molecular fractions of values between f≃5x10–7 and f≃0.1, where f=2N(H2)/(2N(H2)+N(HI)). Upper limits are measured for the remaining 64 systems with detection limits of typically logN(H2)∼14.3, corresponding to logf←5. We find that about 35% of the DLAs with metallicities relative to solar [X/H]≥-1.3 (i.e., 1/20th solar), with X=Zn, S or Si, have molecular fractions logf>-4.5, while H2 is detected - regardless of the molecular fraction - in ∼50% of them. In contrast, only about 4% of the [X/H]←1.3 DLAs have logf>-4.5. We show that the presence of H2 does not strongly depend on the total neutral hydrogen column density, although the probability of finding logf>-4.5 is higher for logN(HI)≥20.8 than below this limit (19% and 7% respectively). The overall H2 detection rate in logN(HI)≥20 DLAs is found to be about 16% (10% considering only logf>-4.5 detections) after correction for a slight bias towards large N(HI). There is a strong preference for H2-bearing DLAs to have significant depletion factors, [X/Fe]>0.4. In addition, all H2-bearing DLAs have column densities of iron into dust grains larger than logN(Fe)dust∼14.7, and about 40% of the DLAs above this limit have detected H2 lines with logf>-4.5. This demonstrates the importance of dust in governing the detectability of H2 in DLAs. Our extended sample supports neither the redshift evolution of the detection fraction of H2-bearing DLAs nor that of the molecular fraction in systems with H2 detections over the redshift range 1.8<zabs≤3.

Abstract Copyright:

Journal keyword(s): cosmology: observations - galaxies: quasars: absorption lines - galaxies: ISM - ISM: molecules

Nomenclature: Table 1: [NLP2008] QSO JHHMM+DDMM abs N.NNN N=77.

CDS comments: Table 1: Q0242-2917 not identified.

Simbad objects: 84

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Number of rows : 84

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 QSO J0003-2603 QSO 00 03 22.9530051057 -26 03 18.306624161   18 17.53     ~ 270 0
2 LBQS 0010-0012 QSO 00 13 06.1513833715 +00 04 31.945146837   19.29 19.05     ~ 80 0
3 [CBM2000] QSO J0016-0012 abs 1.9730 DLA 00 16 02.40 -00 12 25.0           ~ 23 0
4 LBQS 0013-0029 QSO 00 16 02.4050445836 -00 12 25.076529860   18.67 18.36     ~ 169 0
5 QSO B0027-1836 QSO 00 30 23.6257396463 -18 19 56.118776105   18.2 17.9     ~ 41 0
6 QSO B0039-3354 QSO 00 42 16.4582182120 -33 37 54.841208217   18.34 17.74     ~ 14 0
7 LBQS 0049-2820 QSO 00 51 27.1927461395 -28 04 33.967555009     18.1     ~ 42 0
8 [SW2000b] QSO J0051-2804 abs 2.0713 DLA 00 51 27.20 -28 04 35.0           ~ 3 0
9 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 8998 1
10 [RKV2003] QSO J0101-2858 abs 2.673 DLA 01 01 04.60 -28 58 00.9           ~ 9 0
11 QSO B0058-292 QSO 01 01 04.6492810170 -28 58 01.683361609     18.7     ~ 36 0
12 PHL 957 QSO 01 03 11.2740814277 +13 16 17.810502093   16.97 16.57     ~ 321 0
13 [DRT2000] QSO J0103+1316 abs 2.31 DLA 01 03 11.3 +13 16 18           ~ 27 0
14 QSO J0105-1846 QSO 01 05 16.7912539296 -18 46 41.986608187     18.3     ~ 70 0
15 [RKV2003] QSO J0105-1846 abs 2.37 DLA 01 05 16.80 -18 46 42.1           ~ 7 0
16 [RKV2003] QSO J0114+0309 abs 2.42 DLA 01 14 34.9 +03 09 51           ~ 7 0
17 [RKV2003] QSO J0114-3014 abs 2.703 DLA 01 14 51.40 -30 14 09.0           ~ 7 0
18 [RKV2003] QSO J0114-3014 abs 2.419 DLA 01 14 51.40 -30 14 09.0           ~ 8 0
19 QSO B0112+03 QSO 01 14 53.227 +03 14 56.98     18.6     ~ 56 2
20 QSO B0112-30 QSO 01 15 04.8737306476 -30 25 14.963003446           ~ 44 1
21 QSO J0133+0400 QSO 01 33 40.3272635087 +04 00 59.846288616     18.30     ~ 45 0
22 [RKV2003] QSO J0133+0400 abs 3.690 DLA 01 33 40.4 +04 00 59           ~ 9 1
23 [RKV2003] QSO J0133+0400 abs 3.772 DLA 01 33 40.4 +04 00 59           ~ 9 1
24 [LMM2001] QSO J0137-2707 abs 2.8001 ALS 01 37 54.49 -27 07 35.8           ~ 5 0
25 QSO J0137-2707 QSO 01 37 54.5554749127 -27 07 36.617810426   18.6       ~ 21 0
26 [RKV2003] QSO J0218+0817 abs 2.29 DLA 02 18 57.34 +08 17 27.8           ~ 7 0
27 QSO B0216+0803 QSO 02 18 57.3583341300 +08 17 27.351147286     18.1     ~ 87 0
28 HE 0242-2917 QSO 02 42 00.0 -29 17 00           ~ 6 0
29 QSO B0254-404 QSO 02 56 34.0347023899 -40 13 00.407572525     17.4     ~ 30 0
30 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 5297 1
31 QSO B0300-3152 QSO 03 02 11.3270042153 -31 40 30.388818705   17.7       ~ 13 0
32 QSO B0331-4505 BLL 03 32 44.1064721268 -44 55 57.309717321   17.9 17.9     ~ 22 0
33 [EYH2001] QSO J0337-1204 abs 3.178 DLA 03 37 55.40 -12 04 05.0           ~ 8 0
34 QSO B0335-122 QSO 03 37 55.4504495262 -12 04 04.538273332   21.018 20.110 20.199   ~ 56 1
35 [RKV2003] QSO J0339-0133 abs 3.061 DLA 03 39 00.90 -01 33 18.0           ~ 18 0
36 QSO B0336-017 QSO 03 39 00.9861020 -01 33 17.606671   20.1 19.1 18.8   ~ 98 2
37 QSO B0347-383 QSO 03 49 43.6605705480 -38 10 30.834942758     17.3     ~ 173 0
38 [RKV2003] QSO J0349-3810 abs 3.025 DLA 03 49 43.68 -38 10 31.3           ~ 30 1
39 CTQ 247B DLA 04 07 17.99 -44 10 13.4           ~ 21 0
40 [SPL2005] QSO J0407-4410 abs 2.55011 DLA 04 07 17.99 -44 10 13.4           ~ 3 0
41 QSO J0407-4410 QSO 04 07 18.0882243903 -44 10 13.989443935   17.6 17.6     ~ 81 1
42 QSO B0421-2624 QSO 04 23 53.9628213285 -26 18 01.098779316     18.1     ~ 13 0
43 QSO B0425-5214 QSO 04 26 44.5189662228 -52 08 19.798693576   17.8 17.8     ~ 13 0
44 QSO B0432-440 QSO 04 34 03.2148262016 -43 55 47.771354227   19.8 19.60 19.7   ~ 32 0
45 QSO B0450-1310 QSO 04 53 13.5743802506 -13 05 55.082840035   13.2 16.5     ~ 85 2
46 4C -02.19 QSO 05 01 12.80988366 -01 59 14.2562534   19.1 18.4 19.04   ~ 502 1
47 QSO B0528-2505 QSO 05 30 07.96279681 -25 03 29.8994010   18.17 17.34 17.7   ~ 382 0
48 QSO B0551-36 QSO 05 52 46.1825351739 -36 37 27.606597529   17.72 17.57     ~ 81 0
49 QSO B0642-5038 QSO 06 43 27.0080354264 -50 41 12.809659391     18.5     ~ 32 0
50 QSO B0841+129 BLL 08 44 24.2446850407 +12 45 46.527740081   18.28 18.5     ~ 103 0
51 QSO B0913+0715 QSO 09 16 13.9617253427 +07 02 24.488538434     17.1     ~ 90 0
52 QSO B0933-333 BLL 09 35 09.2314159590 -33 32 37.699656543   19.7 20.00 18.9   ~ 29 1
53 QSO B0951-0450 QSO 09 53 55.7476659073 -05 04 18.957152606     19.0     ~ 51 0
54 QSO B1036-2257 QSO 10 39 09.5073121205 -23 13 26.400097195   18.0 18.0     ~ 38 0
55 QSO B1108-07 QSO 11 11 13.600 -08 04 02.00     18.10     ~ 53 0
56 QSO J1113-1533 QSO 11 13 50.6115308594 -15 33 34.006285026   18.7 18.7     ~ 26 0
57 QSO B1117-1329 QSO 11 20 10.3169512408 -13 46 25.945122237     18.00     ~ 47 0
58 QSO B1157+014 QSO 11 59 44.8277890111 +01 12 06.984367162   17.87 17.52     ~ 193 1
59 QSO B1209+0919 QSO 12 11 34.9529988214 +09 02 20.851330054   19.61 19.15     ~ 89 0
60 QSO B1220-1800 QSO 12 23 10.6140341435 -18 16 42.441400819   18.1 18.1     ~ 14 0
61 LBQS 1223+1753 QSO 12 26 07.1942805357 +17 36 49.926547912   18.93 18.59     ~ 96 0
62 LBQS 1232+0815 QSO 12 34 37.5507010309 +07 58 43.372966617     18.4     ~ 109 0
63 QSO B1337+11 QSO 13 40 02.5420534525 +11 06 30.176749720     18.7     ~ 100 0
64 QSO J1342-1355 QSO 13 42 58.8724264812 -13 55 59.811090379   19.2 19.2     ~ 20 0
65 QSO J1356-1101 QSO 13 56 46.8321881764 -11 01 29.227943266   19.0 19.20 17.7   ~ 41 2
66 QSO B1418-064 QSO 14 21 07.7557779885 -06 43 56.356581550   20.4 18.50 19.1   ~ 49 0
67 QSO J1443+2724 QSO 14 43 31.1702656971 +27 24 36.772847043     19.3     ~ 68 0
68 LBQS 1444+0126 QSO 14 46 53.0500684156 +01 13 55.922982686   18.71 18.38     ~ 51 0
69 QSO B1451+123 QSO 14 54 18.5816006547 +12 10 53.905442682     18.6     ~ 72 0
70 QSO B2059-360 QSO 21 02 44.6075037386 -35 53 07.084123633   19.18 18.62     ~ 51 0
71 QSO J2119-3536 QSO 21 19 27.6059088002 -35 37 40.546882117   17.50 17.35     ~ 40 0
72 LBQS 2138-4427 QSO 21 41 59.5010115549 -44 13 25.925906956   19.17 18.20     ~ 59 1
73 LBQS 2206-1958A QSO 22 08 52.0727351941 -19 43 59.869072347   17.49 17.33     ~ 194 0
74 QSO B2222-396 QSO 22 25 40.4399752685 -39 24 36.646426747     17.9     ~ 29 0
75 QSO B2228-399 QSO 22 31 35.3066001746 -39 38 54.311583372     18.3     ~ 21 0
76 LBQS 2230+0232 QSO 22 32 35.2155602853 +02 47 55.814661874   18.387 18.038     ~ 82 0
77 QSO J2246-6015 QSO 22 47 08.9261267635 -60 15 45.301367673           ~ 55 0
78 QSO B2311-373 QSO 23 13 59.7082083928 -37 04 46.211609695   19.0 18.5 19.05   ~ 36 1
79 QSO B2318-1107 QSO 23 21 28.687 -10 51 22.50           ~ 14 0
80 QSO B2332-094 QSO 23 34 46.4052372832 -09 08 12.240476964   19.21 18.62 18.07   ~ 65 0
81 QSO B2343+125 QSO 23 46 28.200 +12 49 00.00     17.5     ~ 120 2
82 QSO B2344+125 QSO 23 46 32.80 +12 45 40.0     17.0     ~ 80 1
83 QSO B2348-0108 QSO 23 50 57.8764286186 -00 52 09.892906411   19.23 18.77 18.7   ~ 128 0
84 QSO B2348-147 QSO 23 51 29.8151829970 -14 27 56.845507757     16.9     ~ 70 1

    Equat.    Gal    SGal    Ecl

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2019.07.18-14:08:03

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