2013ApJ...765..137O

Query : 2013ApJ...765..137O

2013ApJ...765..137O - Astrophys. J., 765, 137 (2013/March-2)

The HST/ACS+WFC3 survey for Lyman limit systems. II. Science.

O'MEARA J.M., PROCHASKA J.X., WORSECK G., CHEN H.-W. and MADAU P.

Abstract (from CDS):

We present the first science results from our Hubble Space Telescope survey for Lyman limit absorption systems (LLS) using the low dispersion spectroscopic modes of the Advanced Camera for Surveys and the Wide Field Camera 3. Through an analysis of 71 quasars, we determine the incidence frequency of LLS per unit redshift and per unit path length, ℓ(z) and ℓ(X), respectively, over the redshift range 1 < z < 2.6, and find a weighted mean of ℓ(X) =0.29±0.05 for 2.0 < z < 2.5 through a joint analysis of our sample and that of Ribaudo et al. Through stacked spectrum analysis, we determine a median (mean) value of the mean free path to ionizing radiation at z = 2.4 of λ912mfp= 243(252) h–172Mpc, with an error on the mean value of ±43 h–172Mpc. We also re-evaluate the estimates of λ912 mfp from Prochaska et al. and place constraints on the evolution of λ912 mfp with redshift, including an estimate of the "breakthrough" redshift of z = 1.6. Consistent with results at higher z, we find that a significant fraction of the opacity for absorption of ionizing photons comes from systems with N_ H I_ ≤ 1017.5/cm2 with a value for the total Lyman opacity of τLymaneff= 0.40±0.15. Finally, we determine that at minimum, a 5-parameter (4 power law) model is needed to describe the column density distribution function f(N_ H I_, X) at z ∼ 2.4, find that f(N_H I_, X) undergoes no significant change in shape between z ∼ 2.4 and z ∼ 3.7, and provide our best fit model for f(N_ H I_, X).

Abstract Copyright: ∼

Journal keyword(s): cosmology: observations - intergalactic medium - quasars: absorption lines - quasars: general - surveys - ultraviolet: general

VizieR on-line data: <Available at CDS (J/ApJ/765/137): table1.dat table2.dat table6.dat>

Simbad objects: 71

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Number of rows : 71
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] J010658.0-085500 QSO 01 06 57.9462432720 -08 55 00.153015780   18.60 18.38     ~ 24 0
2 [VV2006] J023359.7+004938 QSO 02 33 59.7210123312 +00 49 38.473525236   17.98 17.80     ~ 40 0
3 [VV2006] J034024.6-051909 QSO 03 40 24.5842892040 -05 19 09.408053964   18.19 18.07     ~ 22 0
4 [VV2006] J040241.5-064137 QSO 04 02 41.4340099272 -06 41 37.990576824   18.32 18.12     ~ 26 0
5 [VV2006] J075158.6+424522 QSO 07 51 58.6501626168 +42 45 22.869392832   18.09 17.90     ~ 35 0
6 [VV2006] J075547.8+220450 QSO 07 55 47.8418192424 +22 04 50.226382164   18.15 17.94     ~ 46 0
7 QSO J0804+2516 QSO 08 04 13.6609765200 +25 16 33.918226248   18.54 18.28     ~ 40 0
8 QSO J0806+5041 QSO 08 06 20.4804451032 +50 41 24.465261336   18.10 17.91     ~ 29 0
9 [VV2006] J083326.8+081552 QSO 08 33 26.8195265280 +08 15 51.973212996   18.41 18.16     ~ 28 0
10 [VV2006] J084525.9+072221 QSO 08 45 25.8440515944 +07 22 22.331943732   18.63 18.30     ~ 36 0
11 [VV2006] J084619.5+365836 QSO 08 46 19.5414608088 +36 58 36.756028308   18.37 18.26     ~ 26 0
12 [VV2006] J085045.5+563618 QSO 08 50 45.4445331384 +56 36 18.759864348   18.65 18.35     ~ 33 0
13 US 1859 QSO 08 53 16.5540397440 +44 56 16.564328484   18.76 18.49     ~ 28 0
14 [VV2006] J085417.6+532735 Bla 08 54 17.6111750904 +53 27 35.219380644   17.80 17.47     ~ 49 0
15 [VV2006] J085952.3+350724 QSO 08 59 52.3639292208 +35 07 24.771770544   18.64 18.53     ~ 27 0
16 [VV2006] J090938.7+041525 QSO 09 09 38.7086871624 +04 15 25.937523504   18.64 18.30     ~ 32 0
17 [VV2006] J092849.3+504930 QSO 09 28 49.2364846920 +50 49 30.564377904   18.56 18.36     ~ 31 0
18 [VV2006] J094942.3+052240 QSO 09 49 42.3387036480 +05 22 40.340559360   18.24 18.02     ~ 34 0
19 [VV2006] J100541.2+570544 QSO 10 05 41.2595145552 +57 05 44.598163056   18.44 18.27     ~ 32 0
20 [VV2006] J101120.4+031244 QSO 10 11 20.3977942296 +03 12 44.686157004   18.05 17.91     ~ 34 0
21 [VV2006] J102900.8+622341 QSO 10 29 00.8012513040 +62 23 41.907490728   18.28 18.03     ~ 29 0
22 [VV2006] J104321.5+624127 QSO 10 43 21.5615524272 +62 41 27.286485396   18.19 18.00     ~ 26 0
23 PB 697 QSO 10 53 15.9036357888 +40 07 56.401740084   18.66 18.47     ~ 33 0
24 [VV2006] J110411.6+024655 QSO 11 04 11.6314596600 +02 46 55.394412564   18.59 18.38     ~ 25 0
25 [VV2006] J110735.6+642008 QSO 11 07 35.5782756360 +64 20 08.672382132   17.75 17.53     ~ 35 0
26 [VV2006] J111928.5+130250 QSO 11 19 28.3792469280 +13 02 51.133026552   18.08 17.95     ~ 45 0
27 [VV2000] J113550.6+460705 QSO 11 35 50.6870269536 +46 07 05.112450084   18.18 18.00     ~ 31 0
28 [VV2006] J114311.6+651513 QSO 11 43 11.6113268880 +65 15 13.423255200   17.89 17.72     ~ 29 0
29 [VV2006] J114358.6+052445 QSO 11 43 58.5246314448 +05 24 45.055975392   17.55 17.27     ~ 35 0
30 [VV2006] J120729.7+042909 QSO 12 07 29.7564803472 +04 29 10.029665940   18.44 18.30     ~ 33 0
31 [VV2006] J121519.4+424850 QSO 12 15 19.4309544744 +42 48 51.043096296   18.11 18.00     ~ 32 0
32 [VV2006] J121944.8+461014 QSO 12 19 44.8039763568 +46 10 15.274187364   18.49 18.34     ~ 35 0
33 [VV2006] J122015.5+460802 QSO 12 20 15.5188025160 +46 08 02.438595708   18.42 18.32     ~ 32 0
34 [VV2006] J122836.0+510745 QSO 12 28 36.0581054592 +51 07 46.212208572   18.17 17.99     ~ 32 0
35 [VV2006] J123515.9+630113 QSO 12 35 15.8384723760 +63 01 13.379019312   17.81 17.58     ~ 32 0
36 [VV2006] J124831.6+580929 QSO 12 48 31.6580806680 +58 09 28.769520672   18.21 18.06     ~ 27 0
37 [VV2006] J125345.5+051611 QSO 12 53 45.4878154752 +05 16 11.179671420   18.42 18.18     ~ 31 0
38 [VV2006] J125914.8+672012 QSO 12 59 14.8452309480 +67 20 11.816081736   18.28 18.11     ~ 33 0
39 [VV2006] J130055.6+055620 QSO 13 00 55.6759002816 +05 56 20.621822136   18.29 18.12     ~ 31 0
40 [VV2006] J130240.1+025457 QSO 13 02 40.1700528816 +02 54 57.742875180   18.18 17.98     ~ 30 0
41 [VV2006] J131123.1+453159 QSO 13 11 23.0972481576 +45 31 59.387625912   18.71 18.56     ~ 26 0
42 [VV2006] J131855.8+531207 QSO 13 18 55.7506719456 +53 12 07.211049084   18.59 18.31     ~ 36 0
43 [VV2006] J132312.8+414933 QSO 13 23 12.8373778776 +41 49 33.129744996   18.57 18.40     ~ 26 0
44 [VV2006] J132552.2+663405 QSO 13 25 52.1785844424 +66 34 05.657166228   18.31 18.10     ~ 31 0
45 [VV2006] J133433.9+035545 QSO 13 34 33.8870264760 +03 55 45.187094316   18.37 18.26     ~ 28 0
46 QSO B1333+459 Bla 13 35 21.9623576640 +45 42 38.232772128   18.30 18.22 17.67   ~ 107 1
47 [VV2006] J133523.9+463742 QSO 13 35 23.8186119240 +46 37 42.203732484   18.41 18.25     ~ 28 0
48 LBQS 1334+0212 QSO 13 36 46.5611308704 +01 57 41.843502684   18.26 18.06     ~ 40 0
49 [VV96] J134211.9+601526 QSO 13 42 11.9678078352 +60 15 25.139798676   18.18 18.07     ~ 36 0
50 [VV2006] J135412.3+542100 QSO 13 54 12.2796428352 +54 21 00.182739240   18.55 18.34     ~ 34 0
51 [VV2006] J135445.6+002049 QSO 13 54 45.6648144192 +00 20 50.237703564   18.39 18.20     ~ 39 0
52 [VV2006] J135831.8+050522 QSO 13 58 31.7861805216 +05 05 22.766861292   17.57 17.33     ~ 36 0
53 [VV2006] J140028.9+643030 QSO 14 00 28.8195491904 +64 30 30.960170028   18.43 18.23     ~ 29 0
54 6C 141318+371936 QSO 14 15 28.4667687024 +37 06 21.161952864   18.12 17.94     ~ 85 1
55 [VV2006] J145453.6+032456 QSO 14 54 53.5310207832 +03 24 56.894926320   18.45 18.18     ~ 35 0
56 [VV2006] J145554.4+521828 QSO 14 55 54.3062437584 +52 18 28.630456992   18.25 18.06     ~ 31 0
57 [VV2006] J153335.8+384300 QSO 15 33 35.8163549640 +38 43 01.244703936   18.02 17.83     ~ 31 0
58 [VV98] J153514.8+483700 QSO 15 35 14.6533824696 +48 36 59.692793220   18.36 18.16     ~ 60 1
59 9C J1540+4138 BLL 15 40 42.9792290544 +41 38 16.330065000   17.94 17.68 16.72   ~ 49 1
60 [VV2006] J161003.5+442354 QSO 16 10 03.5385027432 +44 23 53.715746724   18.57 18.46     ~ 31 0
61 [VV2006] J161538.9+392051 QSO 16 15 38.8846735008 +39 20 51.182912004   18.64 18.45     ~ 27 0
62 [VV2000] J161815.5+370103 QSO 16 18 15.5324332632 +37 01 03.889478748   17.99 17.88     ~ 33 0
63 [VV2006] J162516.5+294318 QSO 16 25 16.4229915192 +29 43 18.385716540   18.26 18.08     ~ 34 0
64 QSO B1623+269 QSO 16 25 48.7980918960 +26 46 58.784527056   17.77 17.64     ~ 109 0
65 QSO J1651+4002 BLL 16 51 37.5261118920 +40 02 18.970582056   17.79 17.63     ~ 57 0
66 [VV2006] J165914.5+380900 QSO 16 59 14.5402745304 +38 09 00.774793008   18.40 18.26     ~ 28 0
67 [VV2006] J172409.2+531405 QSO 17 24 09.1980535392 +53 14 05.568494100   18.35 18.12     ~ 26 0
68 [VV2006] J211157.7+002457 QSO 21 11 57.7758671040 +00 24 57.516565104   18.18 17.96     ~ 31 0
69 [VV2006] J213629.5+102952 QSO 21 36 29.4450986736 +10 29 52.226401416   18.42 18.16     ~ 25 0
70 6dFGS gJ230011.8-102144 QSO 23 00 11.7389878872 -10 21 44.465063544   18.69 18.47 18.50   ~ 38 1
71 [VV2006] J233823.2+150445 BLL 23 38 23.1627715704 +15 04 45.278298876   17.92 17.74     ~ 43 0

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