1996A&A...306..395C

Query : 1996A&A...306..395C

1996A&A...306..395C - Astronomy and Astrophysics, volume 306, 395-407 (1996/2-2)

The optical variability of QSOs.

CRISTIANI S., TRENTINI S., LA FRANCA F., ARETXAGA I., ANDREANI P., VIO R. and GEMMO A.

Abstract (from CDS):

The long-term variability of a sample of 180 optically selected QSOs in the field of the Selected Area 94 has been studied. The relations between variability and luminosity and between variability and redshift have been investigated by means of statistical estimators that are "robust" and allow at the same time to eliminate the influence of the measurement errors. A comparison is carried out with the results of two other samples of QSOs, in the fields of the South Galactic Pole (Hook et al., 1994) and of the Selected Area 57 (Trevese et al., 1994). Merging the three samples provides a total of 486 QSOs. The analysis in the QSOs rest frame of both the ensemble structure function (SF) and the individual variability indices show that: 1) a negative correlation between variability and luminosity is clearly present, in the sense that more luminous QSOs show less variability; 2) a significant positive correlation exists between variability and redshift; 3) such correlations may be equally well parameterized either with a model in which the timescale of the variability is fixed for all the QSOs (τ∼2.4yr), while the amplitude linearly increases with the absolute magnitude and redshift, or with a model in which the timescale of the variability linearly depends on the absolute magnitude and the amplitude is only a function of the redshift. The same analysis carried out in the observer's frame provides the following results: 1) there is a negative correlation between variability and luminosity; 2) the timescale of variability does not depend significantly either on the absolute magnitude or on the redshift; 3) the ensemble structure function is well represented by a parameterization in which, with a fixed timescale of about 5.5yr, the amplitude linearly increases with the absolute magnitude; 4) although the general behaviour of the SF does not show a systematic variation of the timescale and/or amplitude with redshift, if we examine the average variability index for objects with -25>MB>-27, we find that below redshift 1 quasars are significantly less variable than at higher redshift. The implications in terms of the black-hole, starburst and microlensing models are briefly discussed.

Abstract Copyright: ∼

Journal keyword(s): QSOs: general

Nomenclature: Table 1: [CTL96] HHMMSS.ss+DDMMSS.s N=180

Simbad objects: 181

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Number of rows : 181
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 US 3133 QSO 02 46 03.6838440216 -00 32 11.815175976   19.01 18.73     ~ 43 0
2 QSO B0243-0108 QSO 02 46 06.2138096544 -00 55 31.877642748   20.13 19.83     ~ 23 0
3 QSO B0243-0152 QSO 02 46 08.6747899728 -01 39 34.122364416   20.2       ~ 13 0
4 QSO B0243+0110 QSO 02 46 11.5968146568 +01 23 23.834081472   18.58 18.46     ~ 11 0
5 US 3137 QSO 02 46 17.0880259992 -00 06 02.707825680   18.78 18.44     ~ 37 0
6 US 3139 QSO 02 46 21.1121430528 -00 01 52.109173452   19.16 18.75     ~ 35 0
7 QSO B0243-0057 QSO 02 46 28.4970660672 -00 44 57.277753836   20.05 19.90     ~ 26 0
8 US 3142 QSO 02 46 29.3034876912 +01 40 15.551288400   20.4 19.46     ~ 13 0
9 QSO B0243-007 QSO 02 46 32.4470472024 -00 32 14.280794340   19.34 19.10     ~ 46 0
10 QSO B0243-0007 QSO 02 46 32.5459571088 +00 05 29.005535004   19.15 19.13     ~ 27 0
11 QSO B0243-0047 QSO 02 46 32.5607759808 -00 34 39.262216656   20.49 20.34     ~ 25 0
12 PB 6880 QSO 02 46 35.6269552128 -00 08 50.590887828   18.82 18.63     ~ 46 0
13 QSO B0244+0116 QSO 02 46 35.9361226968 +01 28 41.098962036   19.27 18.39     ~ 13 0
14 QSO B0244-0053 QSO 02 46 37.9491216984 -00 41 05.344232856   20.07 19.84     ~ 26 0
15 QSO B0244-0140 QSO 02 46 39.2245002480 -01 27 31.997284560     20.34     ~ 10 0
16 QSO B0244-0015 QSO 02 46 39.8847071304 -00 02 37.169798064   20.36 20.16     ~ 25 0
17 QSO B0244-0144 QSO 02 46 43.047 -01 31 49.88     19.16     ~ 7 0
18 QSO B0244-0202 QSO 02 46 44.4209479680 -01 49 50.187345348   15.7 20.50     ~ 8 0
19 PB 6881 QSO 02 46 47.1602494368 -01 45 34.854918624   18.5 18.85     ~ 15 0
20 QSO B0244-0057 QSO 02 46 50.9431336464 -00 44 57.379596360   19.93 19.58     ~ 34 0
21 PB 6882 Sy1 02 46 51.9154329792 -00 59 30.996862872   17.24 17.05     ~ 71 0
22 US 3152 QSO 02 46 57.6023422800 +01 59 11.552486280   19.6 18.58     ~ 15 0
23 QSO B0244-0203 QSO 02 46 59.2408423392 -01 51 16.576757892   19.7 19.16     ~ 12 0
24 QSO B0244-0009 QSO 02 47 01.1884459704 +00 03 30.224951784   20.21 19.67     ~ 32 0
25 QSO B0244-0142 QSO 02 47 27.9784305120 -01 30 09.067177404     20.20     ~ 10 0
26 QSO B0245-0104 QSO 02 47 39.1192774560 -00 52 21.203538708   20.91 20.64     ~ 25 0
27 QSO B0245-0100 QSO 02 47 47.6004977376 -00 48 10.178232300   19.91 19.72     ~ 26 0
28 QSO B0245-0014 QSO 02 47 48.8745551784 -00 01 47.576348796   19.68 19.46     ~ 34 0
29 QSO B0245-0152 QSO 02 47 50.531 -01 40 19.10     20.32     ~ 10 0
30 US 3163 QSO 02 47 51.2658677928 +01 31 49.018022580   19.0 19     ~ 15 0
31 PB 6886 QSO 02 47 53.4509985432 -01 32 25.209574080   18.9 19.38     ~ 19 0
32 PB 6887 QSO 02 47 56.3511964752 -00 15 56.137074192   18.59 18.34     ~ 47 0
33 QSO B0245-0052 QSO 02 48 01.1030822304 -00 40 15.878234064   19.66 19.47     ~ 26 0
34 QSO B0245+0023 QSO 02 48 07.7161778952 +00 35 52.101059460   19.81 19.62     ~ 24 0
35 QSO B0245+0016 QSO 02 48 15.8535071160 +00 29 16.630197756   20.37 20.05     ~ 21 0
36 QSO B0245-0038 QSO 02 48 20.9096513448 -00 25 46.850510676   19.89 19.59     ~ 26 0
37 [VV96] J024823.5+003552 QSO 02 48 23.5229352384 +00 35 52.734867612   20.10 19.78     ~ 25 0
38 QSO B0245+0037 QSO 02 48 31.8607735992 +00 49 33.090314052   20.00 19.76     ~ 21 0
39 US 3182 QSO 02 48 33.8962852272 -00 46 16.402313856   18.96 18.66     ~ 40 0
40 PB 6891 QSO 02 48 40.6425363624 +02 23 43.319067540   18.70 18.02     ~ 15 0
41 US 3187 QSO 02 48 40.7857332792 -00 35 48.317140536   19.24 18.97     ~ 39 0
42 US 3186 QSO 02 48 40.9875190176 -00 12 28.988464176   19.52 19.09     ~ 34 0
43 QSO B0246-0057 QSO 02 48 46.7237847312 -00 45 03.167385948   20.23 20.14     ~ 17 0
44 QSO B0246+0010 QSO 02 48 55.6052273832 +00 23 06.451786068   19.89 19.57     ~ 30 0
45 US 3193 QSO 02 48 56.5399596744 -00 56 04.279104996   19.12 18.91     ~ 34 0
46 QSO B0246-0146 QSO 02 49 05.9652005208 -01 34 08.815600740   19.0 19.34 18.8   ~ 11 0
47 QSO B0246-0019 QSO 02 49 07.3047558648 -00 06 49.527049320   20.01 19.87     ~ 26 0
48 US 3200 QSO 02 49 22.4070530856 +02 09 02.681394048   19.15 18.99     ~ 12 0
49 QSO B0246-0155 QSO 02 49 22.9604843664 -01 43 14.825899632     19.47     ~ 10 0
50 QSO B0246-0032 QSO 02 49 26.0272171440 -00 19 48.860193144   19.68 19.44     ~ 27 0
51 PB 6894 QSO 02 49 28.8630182040 +01 09 24.675228324   18.96 18.65     ~ 44 0
52 US 3205 QSO 02 49 29.1937283784 -00 21 04.319562960   19.82 19.35     ~ 34 0
53 QSO B0246-0147 QSO 02 49 31.9251585696 -01 34 37.930067760     19.90     ~ 14 0
54 QSO B0247+0020 QSO 02 49 44.1004467024 +00 33 17.393532336   19.90 19.64     ~ 26 0
55 QSO B0247+0141 QSO 02 49 44.8094103096 +01 53 39.974545572   18.42 18.67     ~ 18 0
56 QSO B0247+0110 QSO 02 49 45.2699731632 +01 22 50.443811040   19.48 18.83     ~ 9 0
57 US 3213 QSO 02 49 54.4963228392 +01 01 48.192936600   19.74 19.57     ~ 38 0
58 QSO B0247+0129 QSO 02 50 14.7385894656 +01 42 02.890998252   19.76 19.30     ~ 11 0
59 QSO B0247+0018 QSO 02 50 19.2780066528 +00 31 00.677362296   20.15 19.93     ~ 29 0
60 PB 6900 QSO 02 50 30.7772471256 -00 08 01.903678692   18.45 18.17     ~ 48 0
61 QSO B0248+0105 QSO 02 50 37.9689804336 +01 18 10.497509820   19.79 19.85     ~ 11 0
62 PB 6902 QSO 02 50 38.6860435344 -00 47 39.172062084   18.93 18.64     ~ 50 0
63 [VV96] J025039.8-004749 QSO 02 50 39.8265660456 -00 47 49.572247884   20.15 19.96     ~ 28 0
64 US 3224 QSO 02 50 48.6641901216 +00 02 07.464270120   19.22 18.85     ~ 49 0
65 QSO B0248+0054 QSO 02 50 57.7313388288 +01 06 54.822404700   19.13 19.22     ~ 25 0
66 QSO B0248+0035 QSO 02 51 01.0051898616 +00 48 02.923119432   19.64 19.38     ~ 35 0
67 QSO B0248-0006 QSO 02 51 02.6934341088 +00 06 00.614830392   19.35 19.01     ~ 34 0
68 QSO B0248+0130 QSO 02 51 09.8958092688 +01 42 58.583116728   19.76 19.49     ~ 10 0
69 QSO B0248-0039 QSO 02 51 28.7291650464 -00 26 50.892841284   19.56 19.41     ~ 33 0
70 QSO B0249-0058 QSO 02 51 45.0924214224 -00 46 39.840815316   19.59 19.71     ~ 28 0
71 QSO B0249-0052 QSO 02 51 46.7802027192 -00 40 35.667826104   19.90 19.94     ~ 28 0
72 QSO B0249-0058A QSO 02 51 48.5341274664 -00 46 37.804126332   19.80 19.58     ~ 36 0
73 QSO B0249+007 QSO 02 51 51.2675049024 +00 57 39.243984300   20.30 20.08     ~ 33 0
74 QSO B0249+0118 QSO 02 51 51.8816596056 +01 30 57.201635700   19.47 19.54     ~ 11 0
75 LBQS 0249+0044 QSO 02 51 56.2977503184 +00 57 06.559367184   19.17 19.01     ~ 46 0
76 QSO B0249-0006B QSO 02 52 09.7979710608 +00 05 49.034633568   20.79 20.60     ~ 29 0
77 QSO B0249+0222 QSO 02 52 18.1179912048 +02 35 12.682668624   18.73 18.25     ~ 21 0
78 QSO B0249+0015 QSO 02 52 20.5415139240 +00 27 35.090045964   19.74 19.63     ~ 25 0
79 PB 6910 QSO 02 52 21.0234196488 +00 05 59.212342248   17.62 17.36     ~ 49 0
80 QSO B0249+0018 QSO 02 52 28.5549859176 +00 31 09.030777420   19.18 18.86     ~ 35 0
81 QSO B0249+0048 QSO 02 52 29.7560319840 +01 00 49.102663104   20.13 19.87     ~ 30 0
82 QSO B0250-0058 QSO 02 52 37.7984141880 -00 46 28.016718060   20.17 19.79     ~ 33 0
83 QSO B0250-0106 QSO 02 52 37.9212832992 -00 54 06.555276072   19.49 18.93     ~ 24 0
84 QSO B0250+0140 QSO 02 52 48.1536845952 +01 53 03.677380800   18.85 18.62     ~ 26 0
85 US 3268 QSO 02 52 57.1686777768 -01 02 20.833565712   19.97 19.53     ~ 46 0
86 QSO B0250+0108 QSO 02 53 09.2112652344 +01 20 32.711218080   19.89 19.68     ~ 10 0
87 QSO B0250-0051 QSO 02 53 13.9963769016 -00 39 02.513231028   20.20 19.82     ~ 32 0
88 US 3277 QSO 02 53 16.1401556544 +02 15 33.689446596   19.4 18.81     ~ 14 0
89 QSO B0250+0055 QSO 02 53 16.4594402184 +01 07 59.823931872   19.44 19.05     ~ 47 0
90 US 3279 QSO 02 53 19.5933551544 -01 34 13.849463856   19.4 19.15     ~ 10 0
91 QSO B0250-0009 QSO 02 53 23.6159447520 +00 02 30.487869888   20.13 19.74     ~ 32 0
92 QSO B0250-0039 QSO 02 53 24.6974377536 -00 26 55.846214880   20.02 19.56     ~ 35 0
93 US 3284 QSO 02 53 26.4020663376 -01 34 38.766788724   19.1 19.27     ~ 16 0
94 US 3285 QSO 02 53 29.8886697072 +02 06 44.285593860   20.4 19.05     ~ 13 0
95 QSO B0250+000 QSO 02 53 31.9335123144 +00 16 24.761323164   19.39 19.17     ~ 52 0
96 US 3293 QSO 02 53 40.9450108608 +00 11 10.026852000   19.19 18.83     ~ 57 0
97 QSO B0251-0059 QSO 02 53 45.2067789768 -00 47 06.237931812   19.24 18.94     ~ 40 0
98 QSO B0251-0001B QSO 02 53 56.0802764640 +00 10 57.350032680   19.76 19.55     ~ 39 0
99 QSO B0251-0023 QSO 02 53 56.8181975328 -00 11 23.910791676   19.35 19.05     ~ 33 0
100 QSO B0251+0017 QSO 02 54 01.4527556256 +00 29 16.138947372   19.65 19.45     ~ 33 0
101 QSO B0251-0004 QSO 02 54 22.8600795312 +00 07 58.838567628   20.49 20.08     ~ 35 0
102 QSO B0251-0153 QSO 02 54 25.4410816704 -01 41 25.421363448     19.85     ~ 10 0
103 QSO B0251-0101 QSO 02 54 32.3277310272 -00 49 32.996859384   19.81 19.51     ~ 23 0
104 PB 6925 QSO 02 54 32.5250543496 -00 42 20.075671260   18.74 18.52     ~ 51 0
105 PB 6926 QSO 02 54 43.3157936880 +01 53 18.281009616   17.91 18.00     ~ 18 0
106 US 3333 QSO 02 55 05.6785183392 +00 25 23.030624640   18.09 17.90     ~ 49 0
107 QSO B0252-0005 QSO 02 55 13.0345513296 +00 06 39.427249716   19.59 19.49     ~ 55 0
108 PB 6929 QSO 02 55 15.2058379392 +01 48 28.684266840   18.23 18.07     ~ 37 0
109 QSO B0252-0014 QSO 02 55 28.9334212680 -00 02 19.200152688   19.76 19.43     ~ 39 0
110 US 3354 QSO 02 55 47.0592584280 +00 38 14.946500508   18.98 19.4     ~ 34 0
111 SA 94- reg 02 55 58.10 +00 30 03.6           ~ 47 0
112 PB 6933 QSO 02 55 59.9085826440 +00 53 11.444284428   18.94 18.78     ~ 40 0
113 US 3366 QSO 02 56 00.5864159712 -01 15 43.458273072   19.0 19.20     ~ 10 0
114 SDSS J025602.56+005255.4 QSO 02 56 02.5666086600 +00 52 55.362441108   19.87 19.28     ~ 27 0
115 QSO B0253+0058 QSO 02 56 07.2504632664 +01 10 38.606304864   19.58 19.11     ~ 67 0
116 QSO B0253+0144 QSO 02 56 09.8059914600 +01 56 34.231637868   19.24 19.38     ~ 13 0
117 QSO B0253+0003 QSO 02 56 13.1568996288 +00 15 08.282196072   19.78 19.83     ~ 24 0
118 PB 6936 QSO 02 56 14.0543524728 +00 39 41.077561320   19.65 19.29     ~ 39 0
119 PB 6937 QSO 02 56 16.5307343496 -01 26 38.218679988   17.4 17.00     ~ 38 1
120 QSO B0253-0057 QSO 02 56 19.0134804984 -00 45 01.338049620   18.37 18.20     ~ 38 0
121 QSO B0254-0137 QSO 02 56 40.4159397048 -01 25 45.433782156   19.32 19.06     ~ 19 0
122 PB 6940 QSO 02 56 44.6911855488 +00 12 46.046020716   18.31 18.10     ~ 65 0
123 QSO B0254+0042 QSO 02 56 58.6243108920 +00 54 47.577814308   19.68 19.39     ~ 34 0
124 QSO B0254-0114 QSO 02 57 02.0823150456 -01 02 17.271095244   19.54 19.32     ~ 33 0
125 QSO B0254-0022 QSO 02 57 05.8741576320 -00 10 53.491318716   19.70 19.40     ~ 31 0
126 QSO B0254-0113 QSO 02 57 13.0702592568 -01 01 57.747440928   19.67 19.47     ~ 41 0
127 QSO B0254+0113 QSO 02 57 15.8115993456 +01 25 40.210752468   19.51 19.24     ~ 7 0
128 QSO B0254-0057 QSO 02 57 16.8626966448 -00 45 36.054623268   19.76 19.78     ~ 26 0
129 QSO B0254-0010 QSO 02 57 25.0829771016 +00 01 14.349587196   19.94 19.79     ~ 28 0
130 QSO B0254+0003 QSO 02 57 27.2534314728 +00 15 45.846656712   20.22 19.95     ~ 28 0
131 PB 6948 QSO 02 57 46.2328214064 -01 19 47.359860600   18.4 17.97     ~ 19 0
132 QSO B0255+001 QSO 02 57 51.5461129008 +00 20 45.532342212   20.05 19.64     ~ 38 0
133 QSO B0255+0152 QSO 02 58 03.8181014280 +02 04 03.836279820   19.59 19.79     ~ 11 0
134 QSO B0255-0022 QSO 02 58 04.2728684616 -00 10 59.989440000   19.94 19.66     ~ 31 0
135 US 3437 QSO 02 58 15.5480381136 -00 03 34.244035308   19.66 19.23     ~ 38 0
136 QSO B0255-0020 QSO 02 58 19.3271936040 -00 08 06.303601716   20.38 20.01     ~ 31 0
137 QSO B0256-0107 QSO 02 58 44.2493493288 -00 55 12.711711360   19.84 19.08     ~ 27 0
138 QSO B0256+0150 Sy1 02 58 47.9443276200 +02 02 04.982143632   19.74 19.30     ~ 15 0
139 QSO B0256+0140 QSO 02 58 49.9207472256 +01 52 25.063487508   19.04 19.01     ~ 12 0
140 QSO B0256+0030 QSO 02 58 54.8798955360 +00 42 21.769455888   20.72 20.38     ~ 27 0
141 LBQS 0256-0000 QSO 02 59 05.6356015320 +00 11 21.964472340   18.50 18.11     ~ 133 0
142 QSO B0256-0003 QSO 02 59 06.8918696544 +00 07 57.676020672   19.65 18.99     ~ 34 0
143 US 3456 Sy1 02 59 10.3878446712 -00 22 39.803249100   18.44 18.22     ~ 52 0
144 US 3461 QSO 02 59 22.6322639928 +00 58 29.494346016   19.04 18.91     ~ 40 0
145 QSO B0256+0146 QSO 02 59 22.6920507864 +01 58 51.073301892   19.69 19.43     ~ 13 0
146 PB 6960 BLL 02 59 28.51615658 -00 19 59.9753897   17.74 17.58 17   ~ 135 0
147 US 3468 QSO 02 59 33.7281585168 -00 25 17.714284356   19.09 18.83     ~ 42 0
148 QSO B0257-0020 QSO 02 59 35.8154686776 -00 09 02.804995980   19.53 19.32     ~ 26 0
149 LB 2845 QSO 02 59 37.4641575192 +00 37 36.367307832   16.79 16.72     ~ 77 0
150 QSO B0257-0109 QSO 02 59 39.3857482392 -00 57 53.176055580   19.75 19.73     ~ 24 0
151 QSO B0257-0010 QSO 02 59 49.0942832448 +00 01 39.242867160   19.71 19.52     ~ 24 0
152 QSO B0257+0023B QSO 02 59 57.8559608232 +00 34 54.222920256   19.52 19.32     ~ 30 0
153 PB 6967 QSO 03 00 18.0355956432 +01 28 38.029908684   18.65 19.79     ~ 12 0
154 US 3496 QSO 03 00 25.3645535904 +02 06 15.302440620   18.97 18.94     ~ 11 0
155 US 3499 QSO 03 00 27.1178674944 -00 48 48.887894952   19.50 19.28     ~ 37 0
156 PB 6972 QSO 03 00 29.7768363648 +02 40 50.861837028   16.1 16.1     ~ 33 0
157 QSO B0257-0007 QSO 03 00 29.8104256464 +00 04 20.976146256   19.61 19.47     ~ 27 0
158 QSO B0257+0031 QSO 03 00 33.9218505528 +00 43 24.750176988   20.01 19.77     ~ 31 0
159 QSO B0258-0027 QSO 03 00 35.9682167616 -00 15 33.022430928   19.28 19.03     ~ 38 0
160 US 3505 QSO 03 00 39.3438832392 +02 21 17.293700988   19.4 19.45     ~ 7 0
161 QSO B0258+0020 QSO 03 00 41.7737455920 +00 32 37.576942080   19.47 19.21     ~ 36 0
162 QSO B0258+0005 QSO 03 00 45.2581654344 +00 16 56.729860212   19.26 19.00     ~ 37 0
163 QSO B0258+0009 QSO 03 00 45.4756237056 +00 21 33.095963808   19.90 19.63     ~ 33 0
164 US 3509 QSO 03 00 46.0256922912 +02 22 45.160207716   18.0 17.70     ~ 28 0
165 US 3513 QSO 03 00 48.9405790272 +00 54 40.714823052   18.90 18.77     ~ 43 0
166 US 3514 QSO 03 00 49.8626716008 +01 48 56.347261416   19.90 19.95     ~ 15 0
167 US 3523 QSO 03 01 00.8741678712 +01 49 28.814278440   19.20 19.00     ~ 11 0
168 US 3529 QSO 03 01 29.7351456168 +01 57 38.671885872   19.85 19.25     ~ 10 0
169 QSO B0259+0112 QSO 03 01 37.5786863832 +01 24 41.432578272   19.13 19.22     ~ 9 0
170 PB 6976 QSO 03 01 38.1305974056 +01 38 14.973501192   19.10 19.02     ~ 13 0
171 QSO B0259+0104 QSO 03 01 40.9720647240 +01 15 51.142282200   19.2 19.53     ~ 25 0
172 PB 6978 QSO 03 02 02.7514526760 +01 46 18.165919800   18.62 18.74     ~ 16 0
173 PB 6981 QSO 03 02 06.7724283048 -00 01 21.250864596   18.44 18.33     ~ 41 0
174 QSO B0259-0010 QSO 03 02 14.8219677408 +00 01 25.340686536   20.238 19.736   19.033 ~ 27 0
175 LBQS 0259-0034 QSO 03 02 20.3191140744 -00 22 22.814379120   19.24 19.00     ~ 37 0
176 US 3556 QSO 03 02 30.6108570888 -01 27 47.703327480   18.4 18.17     ~ 13 0
177 PB 6989 QSO 03 03 13.0236290664 -00 14 57.467305824   19.21 18.91     ~ 96 1
178 LBQS 0300-0018 QSO 03 03 15.6743916168 -00 07 02.091697464   18.85 18.64     ~ 43 0
179 LBQS 0301-0035 QSO 03 03 41.0487601176 -00 23 21.907819248   18.26 17.93 17.6   ~ 117 0
180 PB 6992 QSO 03 03 42.7882353336 +00 27 00.527157144   18.35 18.11     ~ 44 0
181 SA 57- reg 13 08 38 +29 23.1           ~ 179 0

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