2003A&A...399..857K


C.D.S. - SIMBAD4 rel 1.7 - 2019.12.15CET11:07:32

2003A&A...399..857K - Astronomy and Astrophysics, volume 399, 857-868 (2003/3-1)

A deep search for 21-cm absorption in high redshift damped Lyman-α systems.

KANEKAR N. and CHENGALUR J.N.

Abstract (from CDS):

We present deep GMRT 21-cm absorption spectra of 10 damped Lyman-α systems (DLAs), of which 8 are at redshifts z>1.3. HI absorption was detected in only one DLA, the z=0.5318 absorber toward PKS 1629+12. This absorber has been identified with a luminous spiral galaxy; the spin temperature limit (Ts≤310K) derived from our observations continues the trend of DLAs associated with bright spirals having low spin temperatures. In seven of the remaining 9 systems, the observations place strong lower limits on the spin temperature of the HI gas. We combine this sample with data taken from the literature to study the properties of all known DLAs with 21-cm absorption studies. The sample of DLAs which have been searched for 21-cm absorption now consists of 31 systems, with Ts estimates available in 24 cases; of these, 16 are at z<2 and 8 at z>2, with 11 (all at z<1) having optical identifications. For the latter 11 DLAs, we find that all of the low Ts DLAs have been identified with large, luminous galaxies, while all the DLAs with high spin temperature (Ts>1000K) have been identified either with LSBs or dwarfs. Further, we find no correlation between impact parameter and spin temperature; it is thus unlikely that the high measured Ts values for DLAs arise from lines of sight passing through the outskirts of large disk galaxies. Instead, the spin temperature of DLAs appears to correlate with the host galaxy type. The trend (noted earlier by Chengalur & Kanekar, 2000MNRAS.318..303C) that low z DLAs exhibit both high and low Ts values while high redshift (z>3) DLAs only show high spin temperatures is present in this expanded data set. Based on this difference in spin temperatures, the Gehan test rules out the hypothesis that DLAs at z>2 and DLAs at z<2 are drawn from the same parent population at ∼99% confidence level. Finally, we use the new GMRT spectra along with 2 spectra from the literature to estimate upper limits on the fraction of cold HI, fCNM, in DLAs at z>3. For local spirals, fCNM∼0.5; in contrast, we find that fCNM<0.3 in all 7 high z absorbers, and fCNM<0.1 in 5 of the 7 cases.

Abstract Copyright:

Journal keyword(s): galaxies: evolution - galaxies: formation - galaxies: ISM - cosmology: observations - radio lines: galaxies

CDS comments: Table 1 : PKS 0336-014 = PKS 0336-017.

Simbad objects: 65

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Number of rows : 65

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 4C 32.03 rG 00 40 55.0 +33 10 07   20       ~ 134 1
2 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 10616 1
3 QSO B0118-272 BLL 01 20 31.6632705443 -27 01 24.643168036   15.89 15.56 15.49   ~ 235 1
4 3C 48 QSO 01 37 41.2995845985 +33 09 35.079126038   16.62 16.20     ~ 2442 2
5 QSO B0201+113 QSO 02 03 46.65705872 +11 34 45.4095674   19.5 19.5 19.41   ~ 178 1
6 [CK2000] QSO J0203+1134 abs 3.3875 DLA 02 03 46.6571 +11 34 45.410           ~ 22 0
7 4C 15.05 Bla 02 04 50.41389571 +15 14 11.0436591   21.9 22.1 21.00   ~ 357 1
8 [DRT2000] QSO J0217+0144 abs 1.35 DLA 02 17 48.9547 +01 44 49.699           ~ 5 0
9 QSO J0217+0144 QSO 02 17 48.95475182 +01 44 49.6990704   16.74 16.09 18.51 13.29 ~ 363 1
10 QSO B0235+1624 BLL 02 38 38.93010 +16 36 59.2746   16.46 15.50 15.92   ~ 1371 2
11 YYG A G 02 38 38.94 +16 36 57.4   20.31       ~ 37 0
12 QSO B0248+430 QSO 02 51 34.53674204 +43 15 15.8291997     18.0 13.72   ~ 187 1
13 [RKV2003] QSO J0251+4315 abs 0.3939 DLA 02 51 34.5368 +43 15 15.829           ~ 8 0
14 4C 05.14 rG 03 23 20.2606504221 +05 34 11.893889982     19     ~ 73 1
15 [EYH2001] QSO J0337-1204 abs 3.178 DLA 03 37 55.40 -12 04 05.0           ~ 8 0
16 QSO B0335-122 QSO 03 37 55.4504495262 -12 04 04.538273332   21.018 20.110 20.199   ~ 56 1
17 [RKV2003] QSO J0339-0133 abs 3.061 DLA 03 39 00.90 -01 33 18.0           ~ 18 0
18 QSO B0336-017 QSO 03 39 00.9861020 -01 33 17.606671   20.1 19.1 18.8   ~ 99 2
19 QSO B0406-180 QSO 04 09 06.6759012689 -17 57 10.224717352     19.0     ~ 30 1
20 [CL2003] QSO J0441-4313 abs 0.101 G 04 41 17.2967 -43 13 43.405           ~ 7 0
21 QSO J0441-4313 QSO 04 41 17.32 -43 13 45.4   16.64 16.36 16.54   ~ 93 1
22 [RKV2003] QSO J0456+0400 abs 0.8597 DLA 04 56 47.11 +04 00 53.1           ~ 23 0
23 QSO B0454+0356 QSO 04 56 47.1747689004 +04 00 52.945030656   16.76 16.53 16.26   ~ 226 1
24 4C -02.19 QSO 05 01 12.80988366 -01 59 14.2562534   19.1 18.4 19.04   ~ 506 1
25 [EYH2001] QSO J0501-0159 abs 2.039 DLA 05 01 12.8099 -01 59 14.256           ~ 29 0
26 PKS 0519-20 rG 05 21 38.91 -20 47 38.7           ~ 27 1
27 [RKV2003] QSO J0530-2503 abs 2.80 DLA 05 30 07.9628 -25 03 29.900           ~ 31 0
28 QSO B0537-286 QSO 05 39 54.28147645 -28 39 55.9478122   19.70 20.0 18.789   ~ 235 2
29 ICRF J054236.1+495107 Sy1 05 42 36.13789843 +49 51 07.2337251   18.45 17.80 17.210   ~ 1236 1
30 ICRF J074110.7+311200 Sy1 07 41 10.7033434 +31 12 00.231016   17.02 16.89 16.322   ~ 402 1
31 [RNT2003] QSO J0813+4813 abs 0.437 DLA 08 13 36.03 +48 13 02.6           ~ 11 0
32 3C 196 Sy1 08 13 36.056090 +48 13 02.63597   18.36 17.79     ~ 472 2
33 7C 082754.29+242103.00 QSO 08 30 52.08619070 +24 10 59.8204032   17.62 17.26 16.30   ~ 454 1
34 [RNT2003] B2 0827+243 G1 ALS 08 30 52.51 +24 11 01.9   22.76       ~ 16 0
35 ICRF J083454.9+553421 Sy2 08 34 54.90395243 +55 34 21.0703658   20.75 19.45 17.180   ~ 247 2
36 [RKV2003] QSO J0954+1743 abs 0.2377 DLA 09 54 56.8236 +17 43 31.222           ~ 14 0
37 QSO B0952+179 QSO 09 54 56.82361250 +17 43 31.2222114   17.31 17.23     ~ 190 1
38 [RKV2003] QSO J1001+5553A abs 1.3911 ALS 10 01 20.69 +55 53 55.7           ~ 12 0
39 7C 095757.60+560823.00 QSO 10 01 20.6915852239 +55 53 55.595776916   17.16 16.95     ~ 686 3
40 QSO J1130-1449 QSO 11 30 07.05259287 -14 49 27.3881476   17.17 16.90 16 16.97 ~ 614 1
41 [RKV2003] QSO J1130-1449 abs 0.3130 ALS 11 30 07.0526 -14 49 27.388           ~ 23 0
42 [PSL2000] QSO J1159+0112 abs 1.944 DLA 11 59 44.82 +01 12 06.9           ~ 17 0
43 QSO B1157+014 QSO 11 59 44.8277890111 +01 12 06.984367162   17.87 17.52     ~ 195 1
44 [RKV2003] QSO J1232-0224 abs 0.3953 DLA 12 32 00.01 -02 24 04.7           ~ 18 0
45 4C -02.55 QSO 12 32 00.0157879377 -02 24 04.790684994   17.41 17.06 16.4   ~ 372 1
46 [RKV2003] QSO J1246-0730 abs 0.436 DLA 12 46 04.2321 -07 30 46.575           ~ 5 0
47 QSO J1246-0730 QSO 12 46 04.23210358 -07 30 46.5745473   17.6 18.0 18.2   ~ 162 1
48 3C 283 rG 13 11 39.3 -22 16 41   20       ~ 82 1
49 [DRT2000] QSO J1331+3030 abs 0.6920 DLA 13 31 08.2881 +30 30 32.960           ~ 20 0
50 3C 286 Sy1 13 31 08.2885060664 +30 30 32.960825108   17.51 17.25     ~ 3630 1
51 QSO B1331+170 QSO 13 33 35.7826224 +16 49 04.014213   16.84 16.71 16.41   ~ 402 1
52 [EYH2001] B1354-107b DLA 13 56 46.83 -11 01 29.2           ~ 7 0
53 QSO J1356-1101 QSO 13 56 46.8321881764 -11 01 29.227943266   19.0 19.20 17.7   ~ 42 2
54 7C 1354+2552 QSO 13 57 06.5363496095 +25 37 24.491284935   19.13 18.93     ~ 79 1
55 [RKV2003] QSO J1357+2537 abs 1.4205 DLA 13 57 06.54 +25 37 29.0           ~ 15 0
56 [CK2000] QSO J1415+1320 abs 0.24671 DLA 14 15 58.8175 +13 20 23.712           ~ 9 0
57 QSO B1413+135 BLL 14 15 58.81750938 +13 20 23.7129069   21.055 20.000 18.461   ~ 369 1
58 4C 12.59 QSO 16 31 45.24690 +11 56 02.9910   18.38 18.40     ~ 109 1
59 4C 12.60 rG 16 40 47.93884092 +12 20 02.0791715   19.5       ~ 41 1
60 [RKV2003] QSO J2131-1207 abs 0.4298 DLA 21 31 35.2617 -12 07 04.796           ~ 7 0
61 QSO B2128-123 BLL 21 31 35.26175 -12 07 04.7961   16.33 16.11 15.87   ~ 416 1
62 3C 446 BLL 22 25 47.25929302 -04 57 01.3907581   18.83 18.39 16.3   ~ 754 1
63 [CK2000] QSO J2225-0457 abs 0.4842 DLA 22 25 47.2593 -04 57 01.390           ~ 4 0
64 QSO B2342+3417 QSO 23 44 51.2531223928 +34 33 48.699642129     19.1     ~ 53 1
65 [CK2000] QSO J2344+3433 abs 2.9084 DLA 23 44 51.29 +34 33 48.9           ~ 13 0

    Equat.    Gal    SGal    Ecl

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2019.12.15-11:07:32

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