2015MNRAS.449.1536T

Query : 2015MNRAS.449.1536T

2015MNRAS.449.1536T - Mon. Not. R. Astron. Soc., 449, 1536-1544 (2015/May-2)

36 new, high-probability, damped Lyα absorbers at redshift 0.42 < z < 0.70.

TURNSHEK D.A., MONIER E.M., RAO S.M., HAMILTON T.S., SARDANE G.M. and HELD R.

Abstract (from CDS):

Quasar damped Lyα (DLA) absorption-line systems with redshifts z < 1.65 are used to trace neutral gas over approximately 70 percent of the most recent history of the Universe. However, such systems fall in the UV and are rarely found in blind UV spectroscopic surveys. Therefore, it has been difficult to compile a moderate-sized sample of UV DLAs in any narrow cosmic time interval. However, DLAs are easy to identify in low-resolution spectra because they have large absorption rest equivalent widths. We have performed an efficient strong-Mg ii-selected survey for UV DLAs at redshifts z = [0.42, 0.70] using Hubble Space Telescope's low-resolution ACS-HRC-PR200L prism. This redshift interval covers ∼ 1.8 Gyr in cosmic time, i.e. t ~ [7.2, 9.0] Gyr after the big bang. A total of 96 strong Mg ii absorption-line systems identified in Sloan Digital Sky Survey spectra were successfully observed with the prism at the predicted UV wavelengths of Lyα absorption. We found that 35 of the 96 systems had a significant probability of being DLAs. One additional observed system could be a very high N_H I DLA (N_H I ∼2×10^22 atoms/ cm2 or possibly higher), but since very high N_H I systems are extremely rare, it would be unusual for this system to be a DLA given the size of our sample. Here we present information on our prism sample, including our best estimates of N_H I and errors for the 36 systems fitted with DLA profiles. This list is valuable for future follow-up studies of low-redshift DLAs in a small redshift interval, although such work would clearly benefit from improved UV spectroscopy to more accurately determine their neutral hydrogen column densities.

Abstract Copyright: © 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2015)

Journal keyword(s): galaxies: evolution - galaxies: formation - galaxies: ISM - quasars: absorption lines

VizieR on-line data: <Available at CDS (J/MNRAS/449/1536): table1.dat table2.dat>

Simbad objects: 109

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Number of rows : 109
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 J0018-0913 QSO 00 18 55.2222086520 -09 13 51.134630556   17.71 17.43     ~ 28 0
2 [VV2006] J003740.1-090809 QSO 00 37 40.1350292352 -09 08 10.009701960   18.53 18.27     ~ 27 0
3 QSO J0132-0823 QSO 01 32 09.7615109208 -08 23 50.014684212   19.21 18.86     ~ 25 0
4 [VV2006] J020046.5+132018 QSO 02 00 46.4621119896 +13 20 18.969346392   19.19 18.90     ~ 25 0
5 [VV2006] J021044.0-082513 QSO 02 10 44.0358158160 -08 25 13.347157656   18.61 18.20     ~ 22 0
6 PHL 3989 QSO 02 18 20.1097542120 -08 32 59.465493132   18.45 18.08     ~ 28 0
7 [VV2006] J031154.5-070741 QSO 03 11 54.5186395536 -07 07 41.936478564   19.07 18.72     ~ 28 0
8 [VV2006] J032253.5-071310 QSO 03 22 53.4607773384 -07 13 10.750236168   18.83 18.61     ~ 24 0
9 [VV2006] J073810.9+401409 QSO 07 38 10.9120 +40 14 08.957   18.78 18.39     ~ 25 0
10 [VV2006] J074043.5+344407 QSO 07 40 43.4400988920 +34 44 07.746385236   19.09 18.76     ~ 23 0
11 [VV2006] J074054.0+332006 QSO 07 40 54.0536689152 +33 20 06.388198872   17.67 17.41     ~ 32 0
12 [VV2006] J074816.9+422509 QSO 07 48 16.9752289728 +42 25 09.269113764   17.43 17.08     ~ 32 0
13 [VV2006] J075011.8+222627 QSO 07 50 11.7956316480 +22 26 27.707475588   19.04 18.87     ~ 26 0
14 [VV2006] J080208.9+360417 QSO 08 02 08.9351921544 +36 04 17.661380556   18.51 18.18     ~ 25 0
15 [VV2006] J080231.9+381538 QSO 08 02 31.9203112296 +38 15 38.493501624   18.85 18.66     ~ 24 0
16 [VV2006] J080601.8+275108 Sy1 08 06 01.8049271880 +27 51 08.234387244   19.16 18.85     ~ 25 0
17 6C 080938+502140 QSO 08 13 18.8497193424 +50 12 39.775038588   18.1 18.91 18.0   ~ 41 1
18 [VV2006] J081706.6+261132 QSO 08 17 06.5732603760 +26 11 32.111883744   19.22 19.01     ~ 23 0
19 [VV2006] J081748.2+493821 QSO 08 17 48.2128621968 +49 38 21.445452024   18.3 18.60 18.2   ~ 26 0
20 [VV2006] J081758.1+302933 QSO 08 17 58.1134055760 +30 29 33.876464388   18.89 18.54     ~ 23 0
21 [VV2006] J082103.5+400903 QSO 08 21 03.4990584360 +40 09 03.443582808   18.90 18.58     ~ 24 0
22 [VV2006] J083900.7+370901 QSO 08 39 00.6792207864 +37 09 01.363568400   18.77 18.51     ~ 27 0
23 [VV2006] J084200.7+333215 QSO 08 42 00.7573139088 +33 32 14.942341284   18.62 18.28     ~ 25 0
24 [VV2006] J090724.4+493523 QSO 09 07 24.3765827640 +49 35 24.097268076   19.02 18.68     ~ 25 0
25 [VV2006] J090757.6+421823 QSO 09 07 57.5971033224 +42 18 23.658345396   18.55 18.36     ~ 25 0
26 [VV2006] J091158.2+031628 QSO 09 11 58.2448614408 +03 16 28.279057584   19.26 18.85     ~ 21 0
27 [VV2006] J091750.7+011534 QSO 09 17 50.6822161080 +01 15 34.501748724   19.08 18.79     ~ 25 0
28 [VV2006] J091759.2+031627 QSO 09 17 59.2562804280 +03 16 27.446859984   18.47 18.18     ~ 23 0
29 [VV2006] J092026.8+063948 QSO 09 20 26.8095566688 +06 39 48.222430452   17.9 18.46 17.9   ~ 25 0
30 2MASS J09284517+3831134 Sy1 09 28 45.1759063968 +38 31 13.413779832   18.46 18.16     ~ 37 0
31 7C 094400.90+584446.00 QSO 09 47 35.0867305848 +58 30 46.359693468   18.12 17.90     ~ 37 1
32 [VV2006] J095648.5+383339 QSO 09 56 48.5806890672 +38 33 39.005883252   18.0 18.90 18.2   ~ 26 0
33 [VV2006] J095740.0+080731 QSO 09 57 40.0612263360 +08 07 32.268379836   19.21 18.92     ~ 25 0
34 [VV2006] J095844.1+054941 QSO 09 58 44.0748846048 +05 49 41.040302952   18.12 18.00     ~ 30 0
35 [VV2006] J095848.1+621838 QSO 09 58 48.1060460328 +62 18 39.065347872   18.2 18.80 18.2   ~ 24 0
36 [VV2006] J100154.0+582305 QSO 10 01 54.0345703968 +58 23 06.034253064   18.3 18.91 18.1   ~ 25 0
37 [VV2006] J101211.1+073949 QSO 10 12 11.1134832048 +07 39 49.916002968   19.01 18.71     ~ 25 0
38 [VV2006] J101911.9+010523 QSO 10 19 11.8593578832 +01 05 22.876620144   18.82 18.55     ~ 24 0
39 [VV2006] J103219.7+522342 QSO 10 32 19.7225938296 +52 23 42.894574584   18.5 18.68 18.3   ~ 23 0
40 [VV2006] J103733.5+622640 QSO 10 37 33.5768007576 +62 26 40.336211040   18.6 18.63 18.4   ~ 25 0
41 6C 103844+524909 Bla 10 41 46.78165398 +52 33 28.2317956   16.96 18.5 16.39   ~ 144 1
42 [VV2006] J104754.7+661157 Sy1 10 47 54.6409703472 +66 11 57.362697564   18.79 18.64     ~ 28 0
43 [VV2006] J105823.2+600805 QSO 10 58 23.1362947824 +60 08 05.667004572   18.83 18.55     ~ 27 0
44 [VV2006] J111013.8+523607 QSO 11 10 13.7994954720 +52 36 07.181772516   18.18 17.86     ~ 30 0
45 [VV2006] J111456.7+675423 QSO 11 14 56.7228548040 +67 54 23.119734420   19.10 18.78     ~ 23 0
46 [VV2006] J112016.7+093323 QSO 11 20 16.6487240352 +09 33 23.529465468   18.32 18.00     ~ 28 0
47 [VV2006] J112319.8+620028 QSO 11 23 19.7825386224 +62 00 28.770001632   17.6 18.55 17.8   ~ 29 0
48 [VV2006] J112357.7+662256 QSO 11 23 57.7460553240 +66 22 55.628911848   18.92 18.76     ~ 27 0
49 [VV2006] J113245.5+431638 QSO 11 32 45.5077751232 +43 16 37.985819700   17.84 17.56     ~ 25 0
50 LBQS 1135+0156 QSO 11 38 23.7196816680 +01 39 24.761283588   18.7 18.67 18.3   ~ 34 0
51 [VV2006] J114059.3+552332 QSO 11 40 59.2842153192 +55 23 32.850953916   18.26 18.15     ~ 27 0
52 [VV2006] J120200.7+544241 QSO 12 02 00.6557739192 +54 42 41.710548456   18.91 18.71     ~ 25 0
53 [VV2006] J120449.7+095335 QSO 12 04 49.7330209152 +09 53 35.151613584   18.64 18.33     ~ 30 0
54 [VV2006] J120611.2+581307 QSO 12 06 11.2412753064 +58 13 08.021234100   17.51 17.29     ~ 25 0
55 [VV2006] J120743.7+592648 QSO 12 07 43.7160806400 +59 26 48.312100716   18.75 18.53     ~ 24 0
56 [VV2006] J121753.0+050031 QSO 12 17 53.0205590664 +05 00 30.872843640   17.9 18.68 18.5   ~ 27 0
57 [VV2006] J122322.6+553632 QSO 12 23 22.6163134992 +55 36 32.229983880   19.07 18.68     ~ 24 0
58 QSO B1224+095 QSO 12 27 16.5433638744 +09 14 09.293998884   19.02 18.63     ~ 33 0
59 [VV2006] J123945.4+531804 QSO 12 39 45.3929015448 +53 18 04.916376792   17.9 18.26 17.9   ~ 25 0
60 [VV96] J124312.4+480838 QSO 12 43 12.5234469480 +48 08 38.521401180   18.01 17.81     ~ 40 0
61 [VV2006] J124512.4+570457 QSO 12 45 12.4620559872 +57 04 57.234856764   18.35 18.05     ~ 27 0
62 [VV98] J130544.4+530137 QSO 13 05 44.3232442416 +53 01 36.277115484   17.28 17.10     ~ 32 0
63 [VV2006] J131046.1+613521 QSO 13 10 46.1761572456 +61 35 21.893499456   19.00 18.71     ~ 25 0
64 PB 108 QSO 13 12 04.2634211352 +49 46 32.543738868   18.13 17.81     ~ 33 0
65 [VV2006] J131405.1+041821 QSO 13 14 05.0823606696 +04 18 21.870026496   17.5 18.21 17.7   ~ 24 0
66 [VV2006] J132746.2+484202 QSO 13 27 46.1616305784 +48 42 02.954949444   18.71 18.39     ~ 28 0
67 [VV2006] J133719.3+594905 QSO 13 37 19.3229134344 +59 49 05.513405736   18.40 18.11     ~ 28 0
68 2QZ J133819.9-025251 Sy1 13 38 19.9628094624 -02 52 50.810348244   19.23 18.94     ~ 28 0
69 [VV2006] J133925.0+622639 QSO 13 39 24.9958997952 +62 26 39.217338168   18.2 18.78 18.1   ~ 24 0
70 [VV2006] J134050.9+642544 QSO 13 40 50.8732747872 +64 25 44.920194780   18.79 18.57     ~ 24 0
71 [VV2006] J134541.6-020927 QSO 13 45 41.6719355928 -02 09 27.008074044   19.25 18.97     ~ 25 0
72 [VV2006] J135741.6+052549 Sy1 13 57 41.6544849024 +05 25 48.609394140   19.15 18.85     ~ 26 0
73 PB 1065 QSO 13 58 05.0909340288 +39 35 18.291248376   18.30 18.07     ~ 30 0
74 [VV2006] J135939.4+572355 QSO 13 59 39.3413173656 +57 23 54.806898660   18.72 18.36     ~ 23 0
75 [VV2006] J140528.8+630325 QSO 14 05 28.7589412152 +63 03 25.478629560   19.06 18.78     ~ 24 0
76 6C 140801+651014 QSO 14 09 18.8160689592 +64 55 21.470406024   19.15 18.82     ~ 28 1
77 [VV2006] J141515.5+011252 QSO 14 15 15.4808071200 +01 12 53.233247520   19.21 18.91     ~ 26 0
78 [VV2006] J141607.3+552842 QSO 14 16 07.2813582168 +55 28 41.925107064   18.90 18.68     ~ 26 0
79 [VV2006] J142021.4+594024 QSO 14 20 21.4522792968 +59 40 24.033708912   18.7 19.09 18.6   ~ 24 0
80 [VV2006] J142119.4+611539 QSO 14 21 19.4125070832 +61 15 39.080929428   18.41 18.27     ~ 28 0
81 [VV2006] J142609.8+594629 QSO 14 26 09.7353260664 +59 46 29.595124596   18.33 18.03     ~ 26 0
82 [VV2006] J142816.7+585432 QSO 14 28 16.6908458448 +58 54 32.612071788   18.25 18.14     ~ 33 0
83 7C 143518.60+381731.00 QSO 14 37 19.2013760592 +38 04 37.756998516   18.05 17.84     ~ 34 1
84 LBQS 1440-0234 QSO 14 43 14.1869558880 -02 47 22.097520672   17.64 17.39     ~ 32 0
85 BSO 18 QSO 14 57 12.8718205272 +43 18 49.961390004   18.55 18.20     ~ 28 0
86 6C 150250+475325 QSO 15 04 31.2930006648 +47 41 51.264652128   18.95 18.67     ~ 46 1
87 [VV2006] J151106.4+590111 QSO 15 11 06.4040628672 +59 01 10.979184360   18.80 18.69     ~ 27 0
88 [VV2006] J151413.5+553500 QSO 15 14 13.5948245592 +55 35 00.621052764   18.99 18.72     ~ 24 0
89 [VV2006] J151505.2+041012 QSO 15 15 05.1236849472 +04 10 12.229006152   18.4 18.59 18.3   ~ 31 0
90 [VV2006] J151528.4+454123 QSO 15 15 28.4688422712 +45 41 23.270429832   19.08 18.80     ~ 24 0
91 [VV2006] J152816.6+322258 QSO 15 28 16.6194838800 +32 22 58.045412892   18.19 18.10     ~ 25 0
92 [VV2006] J153106.4+455750 QSO 15 31 06.3371996808 +45 57 50.552798364   18.02 17.85     ~ 28 0
93 [VV2006] J153502.3+371324 QSO 15 35 02.2907122416 +37 13 24.727560132   19.31 19.13     ~ 24 0
94 [VV2006] J154744.6+483603 QSO 15 47 44.5488700008 +48 36 03.460766868   19.20 18.89     ~ 23 0
95 [VV2006] J155024.4+545338 QSO 15 50 24.3271610784 +54 53 38.091841656   18.98 18.68     ~ 22 0
96 [VV2006] J155811.2+394550 QSO 15 58 11.1227326944 +39 45 49.952842884   18.44 18.22     ~ 23 0
97 [VV2006] J161428.1+493004 QSO 16 14 28.0729036920 +49 30 04.442409972   17.88 17.69     ~ 29 0
98 [VV2006] J162806.6+434030 QSO 16 28 06.6880287432 +43 40 29.785557684   18.06 17.82     ~ 28 0
99 4C 12.59 QSO 16 31 45.1708807968 +11 56 03.203387592   18.38 18.40     ~ 122 1
100 [VV2006] J163842.9+204841 QSO 16 38 42.8685325752 +20 48 41.183807868   17.80 17.52     ~ 24 0
101 [VV2006] J164346.9+434645 QSO 16 43 46.8962107440 +43 46 45.036581412   18.02 17.79     ~ 26 0
102 7C 164400.29+380046.00 BLL 16 45 44.6688 +37 55 26.120   18.63 18.54     ~ 36 1
103 SDSS J205601.68-001613.3 QSO 20 56 01.6832884320 -00 16 13.289501892   18.26 18.20     ~ 26 0
104 [VV2006] J211227.3+092011 QSO 21 12 27.3024649560 +09 20 12.248861640   18.79 18.68     ~ 22 0
105 [VV2006] J211905.6+113924 QSO 21 19 05.6430723432 +11 39 24.361367112   17.93 17.83     ~ 24 0
106 1RXS J220539.0+131625 QSO 22 05 37.2361753800 +13 16 29.184087504   19.19 19.05     ~ 24 0
107 QSO J2328+0022 QSO 23 28 20.3832928800 +00 22 38.176896792   18.39 18.06     ~ 69 0
108 QSO J2335+1501 QSO 23 35 44.1891264936 +15 01 18.377883948   18.41 18.19     ~ 42 0
109 LBQS 2350-0045B QSO 23 53 21.6243455328 -00 28 40.657166148   17.5 18.13 17.9   ~ 60 0

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