2009A&A...508..133G

Query : 2009A&A...508..133G

2009A&A...508..133G - Astronomy and Astrophysics, volume 508133-140 (2009/12-2)

Damped and sub-damped Lyman-α absorbers in z > 4 QSOs.

GUIMARAES R., PETITJEAN P., DE CARVALHO R.R., DJORGOVSKI S.G., NOTERDAEME P., CASTRO S., POPPE P.C.R. and AGHAEE A.

Abstract (from CDS):

We present the results of a survey of damped (DLA, log N(HI)>20.3) and sub-damped Lyman-α systems (19.5<logN(HI)<20.3) at z>2.55 along the lines-of-sight to 77 quasars with emission redshifts in the range 4<zem<6.3. Intermediate resolution (R∼4300) spectra were obtained with the Echellette Spectrograph and Imager (ESI) mounted on the Keck telescope. A total of 100 systems with logN(HI)>19.5 were detected of which 40 systems are damped Lyman-α systems for an absorption length of ΔX=378. About half of the lines of sight of this homogeneous survey have never been investigated for DLAs. We study the evolution with redshift of the cosmological density of the neutral gas and find, consistent with previous studies at similar resolution, that ΩDLA,HI decreases at z>3.5. The overall cosmological evolution of ΩHI shows a peak around this redshift. The HI column density distribution for logN(HI)≥20.3 is fitted, consistent with previous surveys, with a single power-law of index α~-1.8±0.25. This power-law overpredicts data at the high-end and a second, much steeper, power-law (or a gamma function) is needed. There is a flattening of the function at lower HI column densities with an index of α~-1.4 for the column density range logN(HI)=19.5-21. The fraction of HI mass in sub-DLAs is of the order of 30%. The HI column density distribution does not evolve strongly from z∼2.5 to z∼4.5.

Abstract Copyright: ∼

Journal keyword(s): Galaxy: evolution - Galaxy: formation - quasars: absorption lines - intergalactic medium - cosmology: observations

VizieR on-line data: <Available at CDS (J/A+A/508/133): table1.dat table2.dat>

Nomenclature: Table 2: [GPD2009] PSS JHHMM+DDMM abs N.NNN, [GPD2009] SDSS JHHMM+DDMM abs N.NNN, [GPD2009] BRI HHMM+DDMM abs N.NNN,[GPD2009] JHHMM+DDMM abs N.NNN, N=100

Simbad objects: 99

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Number of rows : 99
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 J0007+2417 QSO 00 07 38.6226394608 +24 17 24.835551000     18.69     ~ 14 0
2 [VV2006] J001442.8+303202 QSO 00 14 42.8476238304 +30 32 03.173193816     18.81     ~ 7 0
3 [VV2006] J005206.8+240539 QSO 00 52 06.6487954248 +24 05 37.435540812     18.87     ~ 9 1
4 QSO J0117+1552 QSO 01 17 31.0833164376 +15 52 17.013382248     18.60     ~ 20 0
5 QSO J0118+0320 QSO 01 18 52.6712710680 +03 20 49.997683896     18.50     ~ 11 0
6 QSO J0121+0347 QSO 01 21 26.1474572280 +03 47 06.753783480     17.90     ~ 43 0
7 QSO J0127-0045 QSO 01 27 00.6906783576 -00 45 59.149137528   19.95 18.95     ~ 56 0
8 QSO J0131+0633 QSO 01 31 12.1973125968 +06 33 39.741859116     19.10     ~ 11 0
9 QSO J0133+0400 QSO 01 33 40.3265690928 +04 00 59.844453768     18.30     ~ 74 0
10 QSO J0134+3307 QSO 01 34 21.4863198144 +33 07 56.378382420     18.80     ~ 37 0
11 QSO J0206+1216 QSO 02 06 51.3710130024 +12 16 24.288554748     21.51     ~ 12 0
12 [VV2006] J020703.5+094059 QSO 02 07 03.4341645480 +09 40 59.412403704     18.70     ~ 5 0
13 QSO J0209+0517 QSO 02 09 44.6218858992 +05 17 13.727761872     17.80     ~ 60 0
14 QSO J0210-0018 QSO 02 10 43.1633481288 -00 18 18.444357900   23.49 21.97     ~ 69 0
15 QSO J0211-0009 QSO 02 11 02.7239895552 -00 09 10.336384080     22.00     ~ 45 0
16 QSO J0211+1107 QSO 02 11 20.0369218272 +11 07 16.619669508     18.12     ~ 18 0
17 QSO J0231-0728 QSO 02 31 37.6463945454 -07 28 54.550661965   25.25 23.17     ~ 72 0
18 QSO J0244-0108 QSO 02 44 57.1855878240 -01 08 09.894940080   20.57 19.54     ~ 45 0
19 QSO J0248+1802 QSO 02 48 54.2720204400 +18 02 49.274967876     18.4     ~ 49 0
20 [VV2006] J032042.7+020816 QSO 03 20 42.6883332360 +02 08 15.690085404     18.50     ~ 6 0
21 QSO J0338+0021 QSO 03 38 29.3153623704 +00 21 56.241639108   25.10 23.26     ~ 106 0
22 QSO J0338+0018 QSO 03 38 30.022 +00 18 40.09     21.20     ~ 12 1
23 [VV2006] J045251.5+035558 QSO 04 52 51.5123793456 +03 55 57.827043012     18.80     ~ 8 0
24 QSO J0747+4434 QSO 07 47 49.7379630144 +44 34 17.086179108   22.88 21.15     ~ 58 0
25 QSO J0756+4104 QSO 07 56 18.139 +41 04 08.61   25.29 23.32     ~ 57 0
26 QSO B0805+5224 QSO 08 08 49.4238903240 +52 15 15.242663556   21.79 20.40     ~ 58 0
27 QSO J0810+4603 QSO 08 10 54.8770073352 +46 03 57.844886292   21.09 19.75     ~ 36 0
28 [VV2006] J085227.3+504510 QSO 08 52 27.2798456088 +50 45 10.775401056   20.95 19.80     ~ 29 0
29 QSO J0926+3055 QSO 09 26 36.3318814824 +30 55 04.943751060     17.31     ~ 31 0
30 QSO J0941+5947 QSO 09 41 08.3595571920 +59 47 25.771706232   24.62 22.39     ~ 37 0
31 QSO J0947-0425 QSO 09 47 49.5681568632 -04 25 14.947045716     18.80     ~ 10 0
32 QSO J0950+5801 QSO 09 50 14.0511416448 +58 01 36.528673692   19.70 18.56     ~ 45 0
33 QSO B0951-0450 QSO 09 53 55.7485789920 -05 04 18.968856168     19.0     ~ 61 0
34 QSO J0955+5940 QSO 09 55 11.3292372432 +59 40 30.651561732   21.12 19.74     ~ 47 0
35 QSO B0957+33 QSO 09 57 44.4641685312 +33 08 20.768397468   20.70 19.42     ~ 66 0
36 QSO B1013+0035 QSO 10 15 49.0046761680 +00 20 20.010036984   22.25 20.79     ~ 72 0
37 [VV2006] J102656.6+382843 QSO 10 26 56.5977441432 +38 28 43.869350388   21.47 20.28     ~ 32 0
38 QSO B1033-033 QSO 10 36 23.7457432848 -03 43 18.929156772     18.5     ~ 74 0
39 [VV2006] J103919.3+344500 QSO 10 39 19.2765160296 +34 45 04.528036584   22.11 20.59     ~ 31 0
40 SDSS J104433.04-012502.0 QSO 10 44 33.040 -01 25 02.08     21.81     ~ 182 1
41 SDSS J104845.05+463718.3 QSO 10 48 45.058 +46 37 18.38   25.87 24.76     ~ 133 0
42 QSO J1048+4407 QSO 10 48 46.6283653104 +44 07 10.856369964   23.89 21.80     ~ 38 0
43 QSO J1057+4555 QSO 10 57 56.2610108784 +45 55 53.070401748   20.19 18.80 17.2 16.8 ~ 118 0
44 PSS J1058+1245 QSO 10 58 58.3817012496 +12 45 54.925620408     18.00     ~ 24 0
45 [VV2006] J111856.2+370200 QSO 11 18 56.1571645224 +37 02 55.907517768   21.60 20.27     ~ 34 1
46 [VV2006] J114008.7+620530 QSO 11 40 08.6729061528 +62 05 29.998894596   22.80 21.09     ~ 35 0
47 QSO J1159+1337 QSO 11 59 06.5236146648 +13 37 37.671720348   19.50 18.53     ~ 52 0
48 QSO J1204-0021 QSO 12 04 41.7296276952 -00 21 49.533353712   25.41 22.94     ~ 82 0
49 QSO J1208+0010 QSO 12 08 23.82 +00 10 27.8     20.79     ~ 37 0
50 [VV2006] J122623.9+095003 QSO 12 26 23.7752397480 +09 50 04.175952072     18.78     ~ 7 0
51 QSO J1248+3110 QSO 12 48 20.2099865544 +31 10 43.304516364   22.27 21.06     ~ 41 0
52 QSO B1247+3406 QSO 12 49 42.1288582896 +33 49 53.854426452     20.4     ~ 51 0
53 QSO J1253-0228 QSO 12 53 36.3528737088 -02 28 07.744660284     18.80     ~ 42 0
54 [VV2000] J131052.5-005533 QSO 13 10 52.5116110080 -00 55 33.122110944   21.31 19.95     ~ 42 0
55 [VV2006] J131539.6+292440 QSO 13 15 40.0182733752 +29 24 35.201029788   20.35 20.02     ~ 8 0
56 QSO J1317+3531 QSO 13 17 43.1304151704 +35 31 31.964624292   22.58 20.95     ~ 43 0
57 [VV2006] J132512.5+112330 QSO 13 25 12.4927366824 +11 23 29.838681816   22.66 20.95     ~ 60 0
58 [VV2006] J132611.9+074358 QSO 13 26 11.8504307808 +07 43 58.372083372   20.25 18.96     ~ 53 0
59 [VV2006] J133913.0+515404 QSO 13 39 12.9496077984 +51 54 03.693914172   20.84 19.80     ~ 31 0
60 [VV2006] J134743.3+495622 QSO 13 47 43.2948031200 +49 56 21.244863768   20.59 19.26     ~ 58 0
61 [VV2006] J140132.8+411150 QSO 14 01 32.7581644824 +41 11 50.519490360   21.54 20.28     ~ 32 0
62 [VV2006] J140355.7+412617 QSO 14 03 55.6847123232 +41 26 17.186084376   21.36 20.34     ~ 29 0
63 [VV2006] J141831.7+444937 QSO 14 18 31.6980868416 +44 49 37.505065764   21.46 20.11     ~ 33 0
64 QSO J1430+2828 QSO 14 30 31.6167592560 +28 28 31.477323000   22.36 20.84     ~ 30 0
65 QSO J1432+3940 QSO 14 32 24.7687190352 +39 40 24.541195152   23.01 21.19     ~ 46 0
66 QSO J1435+3057 QSO 14 35 23.4209397504 +30 57 21.989586096   21.86 20.51     ~ 39 0
67 QSO J1443+2724 QSO 14 43 31.1697928632 +27 24 36.768781008     19.3     ~ 94 0
68 [VV2006] J144340.7+585653 QSO 14 43 40.7011811832 +58 56 53.241710964   20.45 19.22     ~ 38 0
69 [VV2006] J145833.4+681321 QSO 14 58 33.3307758168 +68 13 22.083649392     18.37     ~ 5 0
70 [VV2006] J150007.7+582937 QSO 15 00 07.6685886768 +58 29 37.525282260     18.60     ~ 7 0
71 QSO J1506+5220 QSO 15 06 54.5506795824 +52 20 04.744002588   21.72 20.14     ~ 57 0
72 QSO B1508+572 QSO 15 10 02.92237321 +57 02 43.3759220   22.73 21.38 19.23   ~ 223 1
73 [VV2006] J153129.9+451708 QSO 15 31 29.9138414808 +45 17 07.760179356   22.65 21.42     ~ 28 0
74 QSO J1535+2943 QSO 15 35 53.8007550912 +29 43 13.680850512   22.17 20.48     ~ 39 0
75 [VV2006] J154340.3+341744 QSO 15 43 40.3818518880 +34 17 44.458407456   22.39 20.38     ~ 30 0
76 [VV2006] J155409.9+183551 QSO 15 54 09.8388780648 +18 35 50.465132196     19.00     ~ 25 0
77 [VV2006] J155502.6+200324 QSO 15 55 02.5460130744 +20 03 25.148627244     18.90     ~ 24 0
78 [VV2006] J161522.9+180356 QSO 16 15 22.8560798184 +18 03 56.306467476     18.42     ~ 20 0
79 SDSS J163033.89+401209.6 QSO 16 30 33.898 +40 12 09.68   26.45 25.01     ~ 89 0
80 QSO J1633+1411 QSO 16 33 19.6287438288 +14 11 42.103797792   21.64 20.28     ~ 46 0
81 QSO J1646+5514 QSO 16 46 56.3884451808 +55 14 46.123613484     18.10     ~ 32 0
82 [VV2000] J171356.1+421808 QSO 17 13 56.1504459408 +42 18 08.547828768   23.19 21.12     ~ 12 0
83 QSO J1715+3809 QSO 17 15 39.4554152376 +38 09 09.936798876     18.56     ~ 19 1
84 QSO J1721+3256 QSO 17 21 06.6397559448 +32 56 36.234598164     19.20     ~ 29 0
85 QSO J1723+2243 QSO 17 23 23.1074068680 +22 43 57.140264100     18.17     ~ 42 0
86 QSO J1737+5828 QSO 17 37 44.8816610544 +58 28 29.588650716   25.47 22.95     ~ 52 0
87 [VV2006] J174550.1+684621 QSO 17 45 50.1468312744 +68 46 21.258175944     19.12     ~ 7 0
88 QSO J1802+5616 QSO 18 02 48.8363975640 +56 16 50.442963780     18.30     ~ 25 0
89 QSO J2122-0014 QSO 21 22 07.3615009656 -00 14 45.585196728   21.76 20.43     ~ 41 0
90 QSO J2154+0335 QSO 21 54 06.7187823360 +03 35 40.258830120     19.00     ~ 15 0
91 QSO J2155+1358 QSO 21 55 02.0017063296 +13 58 25.712205816     18.00     ~ 50 0
92 [VV2006] J220343.4+182813 QSO 22 03 43.3322202216 +18 28 13.639578924     18.74     ~ 7 0
93 [VV2006] J223841.1+260346 QSO 22 38 41.6032168848 +26 03 45.394295580     18.85     ~ 7 0
94 QSO J2241+1352 QSO 22 41 47.7573429024 +13 52 02.741146356   22.20 20.66     ~ 52 0
95 [VV2006] J224405.5+104738 QSO 22 44 05.3911121160 +10 47 37.918082184     18.92     ~ 11 0
96 QSO J2315+0921 QSO 23 15 59.1311325480 +09 21 43.180860096     19.10     ~ 15 0
97 QSO J2322+1944 QSO 23 22 07.164 +19 44 22.98     18.29     ~ 81 0
98 QSO J2323+2758 QSO 23 23 40.9006391448 +27 58 01.198261056     18.51     ~ 18 0
99 QSO J2344+0342 QSO 23 44 03.1101598920 +03 42 26.725817304     18.20     ~ 51 0

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