2003A&A...410...33M

Query : 2003A&A...410...33M

2003A&A...410...33M - Astronomy and Astrophysics, volume 41033-43 (2003/10-4)

Investigating lensing by absorbers in the 2dF-quasar survey.

MENARD B. and PEROUX C.

Abstract (from CDS):

We use the first data release of the 2-degree Field quasar survey to investigate the effect of gravitational magnification by foreground absorbing systems on background quasars. We select two populations of quasars from this sample: one with strong MgII/FeII absorbers and one without. The selection is done in such a way that the two populations have the same redshift distribution and the absorber detection procedure discards possible biases with quasar magnitude. We then compare their magnitude distributions and find a relative excess of bright quasars with absorbers. This effect is detected at the 2.4, 3.7 and 4.4σ levels in u-, b- and r-bands. Various explanations of the observed phenomenon are considered and several lines of evidence point towards gravitational lensing causing some of the differences observed in the magnitude distributions. We note that physical quasar-absorber associations may contribute to some extent to the observed correlations for low quasar-absorber velocity differences. We discuss the implications of these findings and propose future work which will allow us to strengthen and extend the results presented here.

Abstract Copyright: ∼

Journal keyword(s): cosmology: observations - quasars: absorption lines - cosmology: gravitational lensing - surveys

VizieR on-line data: <Available at CDS (J/A+A/410/33): tablea2.dat>

Simbad objects: 110

goto Full paper

goto View the references in ADS

Number of rows : 110
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 J0005-2903 QSO 00 05 33.9712327896 -29 03 08.322711336   18.90       ~ 8 0
2 QSO J0008-3105 QSO 00 08 11.6215897440 -31 05 07.800717480   19.05       ~ 8 0
3 QSO J0011-2925 QSO 00 11 23.8783382328 -29 25 00.277745556   18.50       ~ 8 0
4 QSO J0012-2927 QSO 00 12 33.1668688656 -29 27 17.784692460   19.07       ~ 8 0
5 QSO J0028-2719 QSO 00 28 32.3513873544 -27 19 16.894235856   18.4       ~ 10 0
6 QSO J0031-2924 QSO 00 31 42.9651544464 -29 24 33.590795940   18.76       ~ 8 0
7 QSO J0035-2912 QSO 00 35 33.7191419688 -29 12 46.158367140   20.00       ~ 8 0
8 QSO J0038-3015 QSO 00 38 43.9479739824 -30 15 11.571763860     18.53     ~ 9 0
9 QSO J0044-3026 QSO 00 44 06.3590386368 -30 26 39.972383124   19.68       ~ 8 0
10 QSO J0056-2901 QSO 00 56 28.5037983528 -29 01 04.312520076   19.1       ~ 13 0
11 QSO J0111-2843 QSO 01 11 02.0188206048 -28 43 07.284208548   18.59       ~ 8 0
12 QSO J0117-2958 QSO 01 17 20.9817417408 -29 58 13.075546656   19.36       ~ 8 0
13 QSO J0120-3011 QSO 01 20 12.8664041304 -30 11 06.606762576   18.96       ~ 8 0
14 QSO J0123-2936 QSO 01 23 15.6437094048 -29 36 14.890682592   18.66       ~ 8 0
15 QSO J0130-2850 QSO 01 30 32.6673784704 -28 50 16.560509856   19.32       ~ 8 0
16 QSO J0133-2922 QSO 01 33 56.8298216880 -29 22 22.567675872   20.09       ~ 8 0
17 QSO J0136-2947 QSO 01 36 59.8537922016 -29 47 26.717406432   18.43       ~ 8 0
18 QSO B0145-2744 QSO 01 47 29.5468607280 -27 29 15.870352992   19.29       ~ 9 0
19 QSO J0148-3028 QSO 01 48 45.0064195944 -30 28 16.416751836   18.39       ~ 8 0
20 QSO J0155-2838 QSO 01 55 50.0686841136 -28 38 33.222978600   20.09       ~ 8 0
21 QSO J0155-3026 QSO 01 55 53.8755730296 -30 26 49.384567680   19.49       ~ 8 0
22 QSO J0156-2831 QSO 01 56 48.0097 -28 31 43.263   19.63       ~ 9 0
23 QSO J0159-3106 QSO 01 59 29.8016295312 -31 06 18.573108804   18.98       ~ 8 0
24 QSO J0211-2937 QSO 02 11 34.8189057384 -29 37 50.731089564   18.97       ~ 8 0
25 QSO J0218-2921 QSO 02 18 26.9868516000 -29 21 20.677401720   19.20       ~ 8 0
26 QSO J0222-2732 QSO 02 22 15.6953319744 -27 32 30.950216124   19.20       ~ 8 0
27 QSO B0224-2911 QSO 02 26 20.5011238032 -28 57 50.768350776   18.43       ~ 19 0
28 QSO J0232-2914 QSO 02 32 12.8939090448 -29 14 50.053153920   19.67       ~ 8 0
29 QSO B0246-3122 QSO 02 48 24.4561052232 -31 09 44.581725072   18.59       ~ 9 0
30 QSO J0252-3211 QSO 02 52 59.6505945192 -32 11 26.013590736   18.78       ~ 8 0
31 QSO J0256-3117 QSO 02 56 08.0634985752 -31 17 32.252193348   18.78       ~ 8 0
32 QSO J0259-3216 QSO 02 59 19.2522327960 -32 16 50.177435340   19.34       ~ 8 0
33 QSO B0300-3227 QSO 03 02 49.7174279448 -32 16 00.622170408   18.27       ~ 12 0
34 QSO J0303-3007 QSO 03 03 24.3784667832 -30 07 33.834922428   18.69       ~ 8 0
35 QSO J0306-3020 QSO 03 06 47.6753457336 -30 20 21.231672936   19.03       ~ 8 0
36 QSO J0307-3039 QSO 03 07 11.4510953472 -30 39 35.097367824   19.09       ~ 8 0
37 QSO J0307-3025 QSO 03 07 18.5407167840 -30 25 17.191460064   19.48       ~ 8 0
38 QSO J0309-2855 QSO 03 09 44.7893410272 -28 55 12.968727672   19.35       ~ 8 0
39 QSO J0312-2810 QSO 03 12 55.0847743992 -28 10 20.806363488   19.21       ~ 8 0
40 QSO J0313-2808 QSO 03 13 09.2665559064 -28 08 07.098023148   19.15       ~ 8 0
41 QSO J0314-3011 QSO 03 14 26.9473558032 -30 11 33.755605188   18.41       ~ 8 0
42 2QZ J095605.0-015037 QSO 09 56 05.1326081712 -01 50 36.456653724   19.04       ~ 11 0
43 QSO J0959-0035 QSO 09 59 38.2822714752 -00 35 00.841501644   19.11 18.93     ~ 34 0
44 QSO J1012-0107 QSO 10 12 30.1397822280 -01 07 42.893420952   19.28       ~ 16 0
45 LBQS 1013-0020 QSO 10 15 56.3129243976 -00 35 05.078626764     18.6     ~ 28 0
46 QSO J1016-0234 QSO 10 16 36.2951128536 -02 34 21.574904880   19.55       ~ 11 0
47 LBQS 1015+0147 QSO 10 17 42.3866557968 +01 32 17.473899264   18.95 18.49     ~ 36 0
48 QSO J1026-0221 QSO 10 26 45.2490315336 -02 21 00.818528040   19.65       ~ 22 0
49 QSO J1053-0201 QSO 10 53 04.0738157952 -02 01 13.038295728   19.96       ~ 9 0
50 2QZ J105620.0-000852 QSO 10 56 20.0668141776 -00 08 51.572828364   18.38 18.15     ~ 34 0
51 2QZ J110603.4+002207 QSO 11 06 03.4147785672 +00 22 07.866501780   18.97 18.82     ~ 30 0
52 QSO J1107+0003 QSO 11 07 36.6754543512 +00 03 29.475462060   19.16 18.81     ~ 45 0
53 QSO J1141+0008 QSO 11 41 01.4082153672 +00 08 25.887886152   19.89       ~ 10 0
54 QSO J1153-0246 QSO 11 53 52.0687692600 -02 46 08.629182480   19.42       ~ 10 0
55 QSO J1155-0154 QSO 11 55 59.7600597504 -01 54 19.084811436   19.28 18.94     ~ 26 0
56 QSO J1204+0026 QSO 12 04 55.0944843360 +00 26 41.390011356   19.48 19.26     ~ 30 0
57 QSO J1208-0205 QSO 12 08 26.9389277400 -02 05 30.635482200   19.35       ~ 11 0
58 QSO J1208-0145 QSO 12 08 27.0392828664 -01 45 24.357027276   19.69       ~ 9 0
59 QSO J1208-0207 QSO 12 08 36.2967150432 -02 07 26.426447760   19.28 18.95     ~ 29 0
60 QSO J1224-0127 QSO 12 24 54.4453624704 -01 27 51.881546052   19.64       ~ 10 0
61 QSO J1250+0002 QSO 12 50 31.6249670976 +00 02 17.430406692   19.57 19.24     ~ 32 0
62 QSO J1256-0021 QSO 12 56 58.3914510120 -00 21 22.978550736   19.02 18.71     ~ 30 0
63 2QZ J130019.9+002641 QSO 13 00 20.0009435640 +00 26 41.413846884   18.80 18.65     ~ 33 0
64 QSO J1304-0139 QSO 13 04 33.1158713544 -01 39 15.064415640   20.09 19.75     ~ 27 0
65 2QZ J130622.8-014541 QSO 13 06 22.9238180640 -01 45 40.769147916   19.27 19.07     ~ 34 0
66 LBQS 1328+0047 QSO 13 30 52.3692070608 +00 32 18.281082372   18.51 18.29     ~ 36 0
67 QSO J1344-0052 QSO 13 44 48.1073612208 -00 52 57.004169232   19.41 19.19     ~ 29 0
68 QSO J1359-0020 QSO 13 59 41.1926875992 -00 20 15.331327548   18.48 18.23     ~ 29 0
69 2QZ J140224.1+003001 QSO 14 02 24.1606238520 +00 30 02.246281488   19.19 18.91     ~ 41 0
70 QSO J1407-0049 QSO 14 07 10.5927107952 -00 49 15.260971980   19.32 19.05     ~ 34 0
71 QSO J1410+0015 QSO 14 10 51.2457121584 +00 15 46.944584064   19.29 18.42     ~ 20 0
72 QSO J1447-0148 QSO 14 47 15.5029325832 -01 48 36.218465388   19.17 18.98     ~ 29 0
73 QSO J2147-2910 QSO 21 47 26.8061756184 -29 10 17.057711208   19.39       ~ 8 0
74 QSO J2148-2758 QSO 21 48 36.0446685720 -27 58 54.136332012   18.40       ~ 8 0
75 QSO J2150-2825 QSO 21 50 24.0917609352 -28 25 07.548436128   19.03       ~ 8 0
76 QSO J2150-2805 QSO 21 50 34.5908723640 -28 05 19.230447876   18.63       ~ 8 0
77 QSO J2152-2835 QSO 21 52 22.9145045784 -28 35 48.709205628   18.51       ~ 8 0
78 QSO J2153-3014 QSO 21 53 42.9469857264 -30 14 12.416275068   19.03       ~ 8 0
79 QSO J2153-2921 QSO 21 53 59.0135414856 -29 21 07.522610184   18.75       ~ 8 0
80 QSO J2159-2929 QSO 21 59 55.4149577496 -29 29 08.380121676   18.85       ~ 8 0
81 QSO J2200-3201 QSO 22 00 03.0198071928 -32 01 55.220181384   19.17       ~ 8 0
82 QSO J2201-2907 QSO 22 01 36.9894077640 -29 07 42.517746768   19.36       ~ 8 0
83 QSO J2202-2924 QSO 22 02 08.5364028648 -29 24 21.577026132   18.96       ~ 8 0
84 QSO J2202-2930 QSO 22 02 14.0015475408 -29 30 38.355615324   18.45       ~ 8 0
85 QSO J2206-3136 QSO 22 06 55.3806885240 -31 36 20.730959460   19.31       ~ 8 0
86 QSO J2211-2724 QSO 22 11 55.2270828000 -27 24 26.829813348   18.80       ~ 8 0
87 QSO J2215-2734 QSO 22 15 46.3929154200 -27 34 40.284070248   19.14       ~ 8 0
88 2QZ J222849.4-304735 QSO 22 28 49.4236333584 -30 47 34.457902584   19.00     18.057 ~ 9 0
89 QSO J2233-3106 QSO 22 33 09.9754554864 -31 06 16.871334336   18.64       ~ 9 0
90 QSO J2240-3114 QSO 22 40 09.4523419560 -31 14 19.671823464   19.23       ~ 9 0
91 QSO J2259-2854 QSO 22 59 15.2279652744 -28 54 57.603975372   19.07       ~ 8 0
92 2QZ J230214.7-312139 QSO 23 02 14.7605417424 -31 21 38.715931908   19.71       ~ 8 0
93 QSO J2308-2856 QSO 23 08 29.8824735096 -28 56 50.707510008   19.06       ~ 8 0
94 2QZ J230915.3-273509 QSO 23 09 15.3522759768 -27 35 08.431950120   19.20       ~ 7 0
95 QSO J2312-3118 QSO 23 12 27.4822766112 -31 18 14.648871744   18.70       ~ 9 0
96 QSO J2314-2911 QSO 23 14 59.5244704896 -29 11 46.080832056   18.68       ~ 8 0
97 QSO J2320-3015 QSO 23 20 23.2439524848 -30 15 06.012655920   19.60       ~ 9 0
98 QSO B2320-2937 QSO 23 23 30.4314489192 -29 21 23.103390240   19.47       ~ 9 0
99 QSO J2327-3026 QSO 23 27 00.2684264016 -30 26 36.743916624   18.97       ~ 9 0
100 QSO J2329-3013 QSO 23 29 14.9161250304 -30 13 39.212701356   19.64       ~ 9 0
101 QSO J2329-3023 QSO 23 29 42.3352875984 -30 23 48.259095468   19.35       ~ 8 0
102 QSO J2339-3120 QSO 23 39 40.1716998528 -31 20 36.053860632   19.16       ~ 8 0
103 QSO J2343-3040 QSO 23 43 21.7056886464 -30 40 36.200538948   18.90       ~ 8 0
104 QSO J2344-2932 QSO 23 44 00.9369149568 -29 32 24.177909228   18.26       ~ 8 0
105 QSO J2344-2955 QSO 23 44 05.8444520304 -29 55 33.255331104   18.55       ~ 8 0
106 QSO J2345-3118 QSO 23 45 27.6364849104 -31 18 42.247124424   18.5       ~ 10 0
107 QSO J2345-3136 QSO 23 45 50.4953088264 -31 36 11.696423976   18.89       ~ 8 0
108 QSO J2347-3045 QSO 23 47 53.0572568472 -30 45 07.695058788   18.56       ~ 8 0
109 QSO B2354-2753 QSO 23 57 14.9517357072 -27 36 59.452265196   18.92       ~ 12 0
110 QSO J2357-3035 QSO 23 57 22.1376923064 -30 35 13.037932320   19.36       ~ 8 0

To bookmark this query, right click on this link: simbad:objects in 2003A&A...410...33M and select 'bookmark this link' or equivalent in the popup menu