2009MNRAS.394L..61K

Query : 2009MNRAS.394L..61K

2009MNRAS.394L..61K - Mon. Not. R. Astron. Soc., 394, L61-L65 (2009/March-3)

The covering factor of high-redshift damped lyman-α systems.

KANEKAR N., LANE W.M., MOMJIAN E., BRIGGS F.H. and CHENGALUR J.N.

Abstract (from CDS):

We have used the Very Long Baseline Array to image 18 quasars with foreground damped Lyman-α systems (DLAs) at 327, 610 or 1420 MHz, to measure the covering factor f of each DLA at or near its redshifted Hi 21 cm line frequency. Including six systems from the literature, we find that none of 24 DLAs at 0.09 < z < 3.45 has an exceptionally low covering factor, with f ∼ 0.45-1 for the 14 DLAs at z > 1.5 and f ∼ 0.41-1 for the 10 systems at z < 1, and consistent covering factor distributions in the two subsamples. The observed paucity of detections of Hi 21 cm absorption in high-z DLAs thus cannot be explained by low covering factors and is instead likely to arise due to a larger fraction of warm Hi in these absorbers.

Abstract Copyright: © 2009 The Authors. Journal compilation © 2009 RAS

Journal keyword(s): galaxies: ISM - quasars: images

Nomenclature: Table 1, Text: [KLM2009] {QSO} HHMM+DDd {abs} N.NNNN N=18+4, [KLM2009] {3C 286 abs} N.NNN N=1.

Simbad objects: 31

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Number of rows : 31
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 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
2 QSO B0201+113 Bla 02 03 46.65705710 +11 34 45.4094619   19.5 19.5 19.41   ~ 216 1
3 7C 020156.39+363507.00 QSO 02 04 55.5959081688 +36 49 17.992097868     18.1     ~ 127 1
4 QSO B0235+1624 BLL 02 38 38.93010450 +16 36 59.2745528   16.46 15.50 15.92   ~ 1614 2
5 QSO B0335-122 Bla 03 37 55.4513467728 -12 04 04.551994488   21.018 20.110 20.199   ~ 88 1
6 [VV2006] J033919.1-011321 QSO 03 39 19.1591872848 -01 13 21.690839208   20.26 19.90     ~ 24 0
7 QSO B0405-331 Bla 04 07 33.91372765 -33 03 46.3581465   19.33   19.77   ~ 65 1
8 QSO B0438-43 Bla 04 40 17.17997576 -43 33 08.6043290   19.31 19.5 18.2   ~ 302 2
9 QSO B0454+0356 Bla 04 56 47.1747907776 +04 00 52.946102484   16.76 16.53 16.26   ~ 247 1
10 4C -02.19 Bla 05 01 12.80988538 -01 59 14.2564557   19.1 18.06 19.04   ~ 624 1
11 QSO B0528-2505 Bla 05 30 07.9627395840 -25 03 29.900044512   18.17 17.34 17.7   ~ 429 1
12 QSO B0537-286 Bla 05 39 54.28147904 -28 39 55.9481236   19.70 20.0 18.789   ~ 314 1
13 6C 073759+311929 Bla 07 41 10.70330407 +31 12 00.2291151   17.02 16.89 16.322   ~ 468 1
14 3C 196 Sy1 08 13 36.0561170112 +48 13 02.644966020   18.36 17.79     ~ 578 2
15 7C 082754.29+242103.00 Bla 08 30 52.08619250 +24 10 59.8202919   17.62 17.26 16.30   ~ 563 1
16 QSO B0952+179 QSO 09 54 56.82361677 +17 43 31.2221518   17.31 17.23     ~ 222 1
17 8C 0958+561 QSO 10 01 20.6918953728 +55 53 55.593949272   17.16 16.95     ~ 757 3
18 QSO J1130-1449 Bla 11 30 07.0523452128 -14 49 27.388021944   17.17 16.90 16 16.97 ~ 739 1
19 QSO B1157+014 QSO 11 59 44.8278142392 +01 12 06.985999764   17.87 17.52     ~ 228 1
20 QSO B1228-113 Bla 12 30 55.5556807872 -11 39 09.791771256   22.010   19.115   ~ 81 1
21 4C -02.55 Bla 12 32 00.0159535440 -02 24 04.793069304   17.41 17.06 16.4   ~ 440 1
22 QSO J1246-0730 Bla 12 46 04.23211565 -07 30 46.5746985   17.6 18.0 18.2   ~ 198 1
23 3C 286 Sy1 13 31 08.2883506368 +30 30 32.960091564   17.51 17.25     ~ 4558 2
24 QSO B1331+170 Bla 13 33 35.7827544072 +16 49 04.013500728   16.84 16.71 16.41   ~ 469 1
25 7C 1354+2552 QSO 13 57 06.5354509152 +25 37 24.494694024   19.13 18.93     ~ 101 1
26 QSO B1418-064 Bla 14 21 07.75560722 -06 43 56.3557864   20.4 18.50 19.1   ~ 78 1
27 SBSG 1543+593 LSB 15 44 20.30 +59 12 24.2   17.5 16.9     ~ 55 2
28 4C 23.43 Bla 16 24 39.0838297968 +23 45 12.223370412   17.91 17.47     ~ 343 1
29 3C 345 Bla 16 42 58.80997043 +39 48 36.9939552   16.81 16.59 16.84   ~ 1808 3
30 3C 454.3 Bla 22 53 57.7480438728 +16 08 53.561508864   16.57 16.10 15.22   ~ 3004 2
31 QSO B2342+3417 QSO 23 44 51.2526572424 +34 33 48.696770052     19.1     ~ 67 1

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