2004MNRAS.352..563C

Query : 2004MNRAS.352..563C

2004MNRAS.352..563C - Mon. Not. R. Astron. Soc., 352, 563-570 (2004/August-1)

Molecular fraction limits in Damped Lyman Alpha Absorption systems.

CURRAN S.J., MURPHY M.T., PIHLSTROEM Y.M., WEBB J.K., BOLATTO A.D. and BOWER G.C.

Abstract (from CDS):

We have used the Green Bank Telescope (GBT) and Berkeley-Illinois-Maryland Association (BIMA) array to search for redshifted millimetre absorption in a sample of damped Lyman α absorption systems (DLAs). This increases the number of published systems searched from 18 to 30. In 17 cases we reach 3σ limits of τ≤ 0.1, which is a significant improvement over the previous searches and more than sufficient to detect the four known redshifted millimetre absorbers (τ≳ 1). Although the CO rotational (millimetre) column density limits obtained are weaker than the electronic (optical) limits, they may provide useful limits below the atmospheric cut-off for the Lyman and Werner H2 bands in the UV (zabs≲ 1.8). Using a model for the DLA metallicity evolution combined with assumed HCO+/H2 and CO/H2 conversion ratios, we use the molecular column density limits to calculate plausible H2 molecular fraction limits. Finally, we use these results to discuss the feasibility of detecting rotational CO transitions in DLAs with the next generation of large radio telescopes.

Abstract Copyright: 2004 RAS

Journal keyword(s): galaxies: ISM - quasars: absorption lines - early Universe - radio continuum: galaxies

Nomenclature: Table 1: [CMP2004] QSO J1024-0052 abs 2.398 N=1, [CMP2004] QSO J1405+0415 abs N.NNN N=3.

CDS comments: Table 1: among the 22 DLAs, 18 are already known, see [SW2000b], [EPS2001], [EYH2001], [PGW2003] and [RKV2003]

Simbad objects: 32

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Number of rows : 32
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 QSO B0201+113 Bla 02 03 46.65705710 +11 34 45.4094619   19.5 19.5 19.41   ~ 216 1
2 7C 020156.39+363507.00 QSO 02 04 55.5959081688 +36 49 17.992097868     18.1     ~ 127 1
3 QSO B0235+1624 BLL 02 38 38.93010450 +16 36 59.2745528   16.46 15.50 15.92   ~ 1614 2
4 6C 024820+430300 Bla 02 51 34.53674154 +43 15 15.8292024     18.0 13.72   ~ 221 1
5 QSO B0335-122 Bla 03 37 55.4513467728 -12 04 04.551994488   21.018 20.110 20.199   ~ 88 1
6 QSO B0336-017 Bla 03 39 00.98616588 -01 33 17.6076051   20.1 19.1 18.8   ~ 121 2
7 QSO B0405-331 Bla 04 07 33.91372765 -33 03 46.3581465   19.33   19.77   ~ 65 1
8 4C -02.19 Bla 05 01 12.80988538 -01 59 14.2564557   19.1 18.06 19.04   ~ 624 1
9 QSO B0528-2505 Bla 05 30 07.9627395840 -25 03 29.900044512   18.17 17.34 17.7   ~ 429 1
10 QSO B0537-286 Bla 05 39 54.28147904 -28 39 55.9481236   19.70 20.0 18.789   ~ 314 1
11 6C 073759+311929 Bla 07 41 10.70330407 +31 12 00.2291151   17.02 16.89 16.322   ~ 468 1
12 7C 082754.29+242103.00 Bla 08 30 52.08619250 +24 10 59.8202919   17.62 17.26 16.30   ~ 563 1
13 QSO J0831+5245 QSO 08 31 41.7108197808 +52 45 17.616994560   19.2   14.5 13.9 ~ 574 1
14 QSO B0834-201 Bla 08 36 39.21525204 -20 16 59.5042773   19.45 19.4 18.76   ~ 224 1
15 QSO B0913+003 BLL 09 15 51.69513598 +00 07 13.3089688   21.7 21.70 19.5   ~ 45 1
16 4C 10.29 QSO 10 20 09.9945425592 +10 40 02.694508932   18.74 18.35     ~ 108 1
17 QSO J1024-0052 QSO 10 24 29.58673120 -00 52 55.4963770   18.52 18.35     ~ 143 1
18 QSO J1217+3305 Bla 12 17 32.5421411376 +33 05 38.030803980     17.5 17.7   ~ 122 1
19 4C -02.55 Bla 12 32 00.0159535440 -02 24 04.793069304   17.41 17.06 16.4   ~ 440 1
20 QSO B1251-407 Bla 12 53 59.53371155 -40 59 30.6858434   23.7 19.9 19.9   ~ 54 1
21 3C 286 Sy1 13 31 08.2883506368 +30 30 32.960091564   17.51 17.25     ~ 4558 2
22 QSO B1331+170 Bla 13 33 35.7827544072 +16 49 04.013500728   16.84 16.71 16.41   ~ 469 1
23 QSO J1356-1101 Bla 13 56 46.8321231864 -11 01 29.227444572   19.0 19.20 17.7   ~ 54 1
24 QSO B1402+044 Bla 14 05 01.11981857 +04 15 35.8188818   19.86 19.53 19.22   ~ 204 1
25 QSO B1418-064 Bla 14 21 07.75560722 -06 43 56.3557864   20.4 18.50 19.1   ~ 78 1
26 QSO B1451-375 Bla 14 54 27.40976313 -37 47 33.1448219   16.36 16.69 16.14   ~ 201 1
27 QSO B1614+051 Bla 16 16 37.55681923 +04 59 32.7365717   19.60 19.17 19.49   ~ 195 2
28 QSO B1830-211 Bla 18 33 39.9399138048 -21 03 39.368838780     18.70 21   ~ 724 1
29 QSO B2128-123 BLL 21 31 35.2617909696 -12 07 04.795364172   16.33 16.11 15.87   ~ 470 1
30 QSO J2134-0419 QSO 21 34 12.0103883184 -04 19 09.866519544     19.98     ~ 31 1
31 QSO B2136+1410 Bla 21 39 01.30926630 +14 23 35.9921774     18.90 18.22   ~ 264 1
32 QSO B2342+3417 QSO 23 44 51.2526572424 +34 33 48.696770052     19.1     ~ 67 1

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