2014MNRAS.443.2783J

Query : 2014MNRAS.443.2783J

2014MNRAS.443.2783J - Mon. Not. R. Astron. Soc., 443, 2783-2800 (2014/September-3)

The Magellan uniform survey of damped Lyman α systems - II. Paucity of strong molecular hydrogen absorption.

JORGENSON R.A., MURPHY M.T., THOMPSON R. and CARSWELL R.F.

Abstract (from CDS):

We present the first large, blind and uniformly selected survey for molecular hydrogen (H2) in damped Lyman α systems (DLAs) with moderate-to-high resolution spectra. 86 DLAs were searched for absorption in the many Lyman and Werner H2 transitions, with ~79 per cent completeness for H2 column densities above N(H2) = 1017.5/cm2 for an assumed Doppler broadening parameter b = 2 km/s. Only a single strong H2 absorber was found - a system detected previously in Very Large Telescope/Ultraviolet and Visual Echelle Spectrograph spectra. Given our distribution of N(H2) upper limits, this ∼ 1 per cent detection rate is smaller than expected from previous surveys at 99.8 per cent confidence. Assuming the N(H2) distribution shape from previous surveys, our detection rate implies a covering factor of ∼ 1 per cent for N(H2) ≥ 1017.5/cm2 gas in DLAs (<6 per cent at 95 per cent confidence). We obtained new Magellan/Magellan Echellette (MagE) spectra for 53 DLAs; 8 km/s resolution spectra were available for 27 DLAs. MagE's moderate resolution (~71 km/s) yields weaker N(H2) upper limits and makes them dependent on the assumed Doppler parameter. For example, half the (relevant) previous H2 detections have N(H2) ≥ 1018.1/cm2, a factor of just 3 higher than our median upper limit. Nevertheless, several tests suggest our upper limits are accurate, and they would need to be increased by 1.8 dex to bring our detection rate within 95 per cent confidence of previous surveys.

Abstract Copyright: © 2014 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2014)

Journal keyword(s): galaxies: evolution - galaxies: high-redshift - intergalactic medium - quasars: absorption lines

Simbad objects: 101

goto Full paper

goto View the references in ADS

Number of rows : 101
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 [VV2006] J001115.2+144601 QSO 00 11 15.2339604624 +14 46 01.809704964   22.68 20.95     ~ 66 0
2 QSO J0013+1358 QSO 00 13 28.2075196056 +13 58 28.013967228   20.65 19.76     ~ 36 0
3 LBQS 0013-0029 QSO 00 16 02.4050159808 -00 12 25.077257064   18.67 18.36     ~ 198 0
4 QSO B0027-1836 QSO 00 30 23.6259434280 -18 19 56.117225244   18.2 17.9     ~ 56 0
5 QSO J0035-0918 QSO 00 35 01.8852012984 -09 18 17.640206928   19.32 19.12     ~ 60 0
6 QSO J0124+0044 QSO 01 24 03.7793700432 +00 44 32.745561900   19.71 18.71 17.9   ~ 101 0
7 QSO J0127+1405 QSO 01 27 47.8093639368 +14 05 43.292658408   18.98 18.69     ~ 32 0
8 QSO J0139-0824 QSO 01 39 01.4050523400 -08 24 44.045742600   19.05 18.80     ~ 52 0
9 QSO J0211+1241 QSO 02 11 29.1657227904 +12 41 10.824313344   19.27 18.90     ~ 35 0
10 QSO J0234-0751 QSO 02 34 08.9719223136 -07 51 07.588559304   19.34 19.14     ~ 39 0
11 [VV2006] J023903.4-003850 QSO 02 39 03.4324706088 -00 38 50.829532908   19.45 19.12     ~ 34 0
12 QSO J0255+0048 QSO 02 55 18.5784341184 +00 48 47.540744316   21.15 20.00     ~ 84 0
13 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 7988 0
14 QSO J0338-0005 QSO 03 38 54.7829436024 -00 05 21.006534876   19.26 18.92     ~ 48 0
15 QSO B0347-383 QSO 03 49 43.6603590912 -38 10 30.825444900     17.3     ~ 196 0
16 QSO J0407-4410 QSO 04 07 18.0880236912 -44 10 13.983623724   17.6 17.6     ~ 103 1
17 QSO B0528-2505 Bla 05 30 07.9627395840 -25 03 29.900044512   18.17 17.34 17.7   ~ 429 1
18 QSO B0551-36 QSO 05 52 46.1824785360 -36 37 27.608212524   17.72 17.57     ~ 98 0
19 QSO B0642-5038 QSO 06 43 27.0080170248 -50 41 12.811001244     18.5     ~ 47 0
20 [VV2006] J091210.4+054742 QSO 09 12 10.3520703600 +05 47 42.136511712   18.96 18.51     ~ 41 0
21 [VV2006] J092721.2+074639 QSO 09 27 21.1882856472 +07 46 39.137604564   19.42 19.09     ~ 32 0
22 QSO J0942+0422 QSO 09 42 02.0480819568 +04 22 44.548204368   17.78 17.47     ~ 66 0
23 [VV2006] J094927.9+111517 QSO 09 49 27.8838658272 +11 15 18.272023704   20.87 19.90     ~ 27 0
24 QSO J0954+0915 QSO 09 54 34.9385140704 +09 15 19.587510180   20.17 19.53     ~ 32 0
25 [VV2006] J100409.3+120256 QSO 10 04 09.3485150102 +12 02 56.562742820   20.52 19.93     ~ 28 1
26 QSO J1004+0018 QSO 10 04 28.4334619224 +00 18 25.643447244   18.83 18.61     ~ 49 0
27 [VV2006] J101954.6+082515 QSO 10 19 54.5400031464 +08 25 15.118272192   18.80 18.42     ~ 44 0
28 QSO J1020+0922 QSO 10 20 40.6230869016 +09 22 54.238672668   19.94 19.20     ~ 46 0
29 [VV2006] J102240.9+044356 QSO 10 22 40.8837174024 +04 43 56.900614872   19.66 19.27     ~ 29 0
30 [VV2006] J102301.0+070918 QSO 10 23 01.0158484632 +07 09 18.224255268   20.59 19.75     ~ 33 0
31 [VV2006] J102942.1+135624 QSO 10 29 42.1184988648 +13 56 24.254325348   20.05 19.59     ~ 27 0
32 [VV2006] J103245.3+014923 QSO 10 32 45.3439196304 +01 49 24.699017064   18.91 18.72     ~ 33 0
33 [VV2006] J103751.1+091035 QSO 10 37 51.0572158320 +09 10 35.020767036   20.60 19.79     ~ 30 0
34 2SLAQ J104001.89-001547.7 QSO 10 40 01.886 -00 15 47.64   22.07 21.88     ~ 5 0
35 2QZ J104252.2+011736 QSO 10 42 52.3250362896 +01 17 36.591913032   18.93 18.69     ~ 40 0
36 SDSS J104845.21+133152.2 QSO 10 48 45.2097695952 +13 31 52.160449584   19.82 19.46     ~ 27 0
37 [VV2006] J105744.5+062914 QSO 10 57 44.4526232640 +06 29 14.450459064   19.32 18.99     ~ 33 0
38 QSO J1100+1122 QSO 11 00 45.2300513352 +11 22 39.148223880   23.42 22.09     ~ 39 0
39 QSO J1106+0816 QSO 11 06 57.8323990368 +08 16 43.311366840   21.45 20.12     ~ 36 0
40 SDSS J110855.46+120953.3 QSO 11 08 55.4652728904 +12 09 53.344550916   20.81 19.72     ~ 52 0
41 SDSS J111109.65+144238.2 QSO 11 11 09.6534790488 +14 42 38.283327000   19.60 19.23     ~ 30 0
42 QSO J1111+1336 QSO 11 11 19.1031731280 +13 36 03.822328512   18.59 17.96     ~ 47 0
43 [VV2006] J111126.0+071459 QSO 11 11 26.0059619064 +07 14 59.521070616   19.51 19.15     ~ 27 0
44 QSO J1112+1333 QSO 11 11 51.6094494408 +13 32 35.858687640   17.30 17.08     ~ 37 0
45 [VV2006] J113334.3+130552 QSO 11 33 34.2291592560 +13 05 53.156929812   19.83 18.95     ~ 35 0
46 [VV2006] J113354.9+022420 QSO 11 33 54.8960494728 +02 24 20.946327588   21.43 20.24     ~ 30 0
47 [VV2006] J114044.4+054608 QSO 11 40 44.4090048168 +05 46 08.330035332   19.99 19.43     ~ 28 0
48 QSO J1142-0012 QSO 11 42 20.2592086272 -00 12 16.282623132   18.75 18.65     ~ 38 0
49 [VV2006] J115158.3+055244 QSO 11 51 58.3450700160 +05 52 44.349472308   19.96 19.50     ~ 25 0
50 [VV2006] J115321.7+101113 QSO 11 53 21.6777044904 +10 11 12.988682700   21.41 20.23     ~ 31 0
51 QSO J1155+0530 QSO 11 55 38.6022229320 +05 30 50.687047944   19.57 18.78     ~ 59 0
52 QSO J1201+0116 QSO 12 01 44.3649782736 +01 16 11.740001304   18.09 17.74 17.4   ~ 66 2
53 QSO J1208+0043 QSO 12 08 47.6369209776 +00 43 21.662159304   19.19 18.91     ~ 33 0
54 QSO J1211+0422 QSO 12 11 17.5953013200 +04 22 22.290863808   18.35 18.13     ~ 50 0
55 QSO B1209+0919 QSO 12 11 34.9526605296 +09 02 20.852132964   19.61 19.15     ~ 107 0
56 [VV2006] J122021.4+092136 QSO 12 20 21.3921862848 +09 21 35.822042244   21.84 20.69     ~ 31 0
57 [VV2006] J122307.6+103448 QSO 12 23 07.5234413832 +10 34 48.194118228   19.20 18.98     ~ 41 0
58 [VV2006] J122602.9+032547 QSO 12 26 02.9094697248 +03 25 47.312175540   19.28 18.94     ~ 29 0
59 [VV2006] J122654.4-005430 QSO 12 26 54.3909631632 -00 54 30.636462240   18.94 18.60     ~ 35 0
60 QSO J1228-0104 BLL 12 28 48.2171709096 -01 04 14.548223316   18.60 18.41     ~ 46 0
61 [VV2006] J123318.1+110032 QSO 12 33 18.1677113256 +11 00 32.338755684   19.78 19.44     ~ 29 0
62 LBQS 1232+0815 QSO 12 34 37.5514444464 +07 58 43.367750796     18.4     ~ 128 0
63 QSO J1240+1455 QSO 12 40 20.9116339536 +14 55 35.634530316   20.15 19.57     ~ 49 0
64 LBQS 1244+1129 QSO 12 46 40.3700829816 +11 13 02.901704808     18.4     ~ 64 0
65 SDSS J125306.73+130604.9 QSO 12 53 06.7274181312 +13 06 04.953513672   20.77 19.93     ~ 29 0
66 SDSS J125316.09+114720.6 QSO 12 53 16.0928323488 +11 47 20.641827408   19.31 18.85     ~ 27 0
67 QSO J1257-0111 QSO 12 57 59.2191767280 -01 11 30.304749804   20.90 19.82     ~ 43 0
68 QSO J1304+1202 QSO 13 04 26.1527243616 +12 02 45.594735432   18.76 18.46     ~ 45 0
69 QSO J1306-0135 QSO 13 06 43.0591078320 -01 35 52.695751704   19.36 19.02     ~ 32 0
70 [VV2006] J130907.9+025432 QSO 13 09 07.9337250624 +02 54 32.611593888   19.55 19.22     ~ 30 0
71 LBQS 1314+0116 QSO 13 17 14.2192840512 +01 00 13.029343632   18.79 18.51     ~ 66 0
72 [VV2006] J133048.7+034032 QSO 13 30 48.6821642280 +03 40 32.116842732   18.80 18.52     ~ 33 0
73 [VV2006] J133701.4-024630 BLL 13 37 01.3951555392 -02 46 30.254123460   19.50 19.11     ~ 42 0
74 [VV2006] J133942.0+054822 QSO 13 39 41.9524636872 +05 48 22.174592616   18.42 18.09     ~ 35 0
75 QSO B1337+11 QSO 13 40 02.5419344664 +11 06 30.181521168     18.7     ~ 120 0
76 [VV2006] J134416.8-032317 QSO 13 44 16.8733266936 -03 23 16.630636668   20.09 19.58     ~ 27 0
77 [VV2006] J135334.7-031022 QSO 13 53 34.7559302568 -03 10 22.233701856   19.91 19.37     ~ 33 0
78 [VV2006] J135804.0+034935 QSO 13 58 03.9748494816 +03 49 36.010834932   19.24 18.91     ~ 41 0
79 QSO J1402+0117 QSO 14 02 00.8838607896 +01 17 51.715076100   19.31 18.96     ~ 30 0
80 QSO J1443+2724 QSO 14 43 31.1697928632 +27 24 36.768781008     19.3     ~ 94 0
81 LBQS 1444+0126 QSO 14 46 53.0501441856 +01 13 55.924449276   18.71 18.38     ~ 75 0
82 [VV2006] J145019.2-011740 QSO 14 50 19.2513373752 -01 17 40.345497204   20.53 19.77     ~ 38 0
83 2SLAQ J145329.53+002357.3 QSO 14 53 29.5346027496 +00 23 57.405454404   18.64 18.46     ~ 39 0
84 [VV2006] J155036.8+053749 QSO 15 50 36.8020149120 +05 37 50.081445372   18.71 18.40     ~ 41 0
85 QSO J2036-0553 QSO 20 36 42.2919965400 -05 53 00.276303984   19.01 18.80     ~ 43 0
86 [VV2006] J204946.4-055453 QSO 20 49 46.3568862288 -05 54 53.450234604   18.85 18.51     ~ 27 0
87 QSO J2122-0014 QSO 21 22 07.3615009656 -00 14 45.585196728   21.76 20.43     ~ 41 0
88 [VV2006] J214129.4+111957 QSO 21 41 29.3875953048 +11 19 58.283450184   19.36 19.06     ~ 26 0
89 [VV2006] J215437.0+110219 QSO 21 54 36.9831843624 +11 02 19.365936036   19.64 19.21     ~ 27 0
90 QSO J2222-0946 QSO 22 22 56.1132566016 -09 46 36.283906272   18.71 18.34     ~ 81 0
91 QSO J2238-0921 QSO 22 38 19.7656691904 -09 21 06.110018208   19.18 18.65     ~ 38 0
92 QSO J2238+0016 Sy1 22 38 43.5714295944 +00 16 47.949283164   20.65 19.74     ~ 44 0
93 [VV2006] J224145.1+122556 QSO 22 41 45.1067822640 +12 25 57.227329848   18.33 18.09     ~ 39 0
94 QSO J2241+1352 QSO 22 41 47.7573429024 +13 52 02.741146356   22.20 20.66     ~ 52 0
95 QSO J2315+1456 QSO 23 15 43.5656821392 +14 56 06.400539564   19.58 18.97     ~ 43 0
96 QSO B2318-1107 QSO 23 21 28.6902031608 -10 51 22.515901344           ~ 21 0
97 QSO B2332-094 QSO 23 34 46.4045250120 -09 08 12.250650732   19.21 18.62 18.07   ~ 89 1
98 QSO J2343+1410 QSO 23 43 52.6291457496 +14 10 14.595664728   18.92 18.62     ~ 38 0
99 QSO B2343+125 QSO 23 46 28.200 +12 49 00.00     17.5     ~ 143 2
100 [VV2006] J234856.5-104130 QSO 23 48 56.4844820496 -10 41 31.220255112   18.87 18.46     ~ 35 0
101 QSO B2348-0108 QSO 23 50 57.8771296800 -00 52 09.886281492   19.23 18.77 18.7   ~ 152 0

To bookmark this query, right click on this link: simbad:objects in 2014MNRAS.443.2783J and select 'bookmark this link' or equivalent in the popup menu