2002ApJ...571..665S

Query : 2002ApJ...571..665S

2002ApJ...571..665S - Astrophys. J., 571, 665-692 (2002/June-1)

A uniform analysis of the Lyα forest at z=0-5. V. The extragalactic ionizing background at low redshift.

SCOTT J., BECHTOLD J., MORITA M., DOBRZYCKI A. and KULKARNI V.P.

Abstract (from CDS):

In Paper III of our series, ``A Uniform Analysis of the Lyα Forest at z=0-5'', we presented a set of 270 quasar spectra from the archives of the Faint Object Spectrograph (FOS) on the Hubble Space Telescope (HST). A total of 151 of these spectra, yielding 906 lines, are suitable for using the proximity effect signature to measure J(ν0), the mean intensity of the hydrogen-ionizing background radiation field, at low redshift. Using a maximum-likelihood technique and the best estimates possible for each QSO's Lyman limit flux and systemic redshift, we find J(ν0)=7.6+9.4–3.0x 10–23 erg.s–1.cm–2.Hz–1.sr–1 at 0.03<z<1.67. This is in good agreement with the mean intensity expected from models of the background which incorporate only the known quasar population. When the sample is divided into two subsamples, consisting of lines with z<1 and z>1, the values of J(ν0) found are 6.5+38.–1.6x10–23 erg.s–1.cm–2.Hz–1.sr–1, and 1.0+3.8–0.2x10–22 erg.s–1.cm–2.Hz–1.sr–1, respectively, indicating that the mean intensity of the background is evolving over the redshift range of this data set. Relaxing the assumption that the spectral shapes of the sample spectra and the background are identical, the best-fit H I photoionization rates are found to be 6.7x10–13 s–1 for all redshifts, and 1.9x10–13 and 1.3x10–12 s–1 for z<1 and z>1, respectively. The inclusion of blazars, associated absorbers, or damped Lyα absorbers, or the consideration of a ΛCDM cosmology rather than one in which ΩΛ=0 has no significant effect on the results. The result obtained using radio-loud objects is not significantly different from that found using radio-quiet objects. Allowing for a variable equivalent width threshold gives a consistently larger value of J(ν0) than the constant threshold treatment, though this is found to be sensitive to the inclusion of a small number of weak lines near the QSO emission redshifts. This work confirms that the evolution of the number density of Lyα lines is driven by a decrease in the ionizing background from z∼2 to z∼0 as well as by the formation of structure in the intergalactic medium.

Abstract Copyright: ∼

Journal keyword(s): Cosmology: Diffuse Radiation - Galaxies: Intergalactic Medium - Galaxies: Quasars: Absorption Lines

VizieR on-line data: <Available at CDS (J/ApJ/571/665): table1.dat table3.dat refs.dat spectra/*>

Simbad objects: 179

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Number of rows : 179
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 ICRF J000559.2+160949 Sy1 00 05 59.2378545384 +16 09 49.021968096   16.51 16.40     ~ 290 1
2 Mrk 335 Sy1 00 06 19.5372339024 +20 12 10.617404076   14.19 13.85     ~ 1253 0
3 Mrk 1501 Sy1 00 10 31.00590413 +10 58 29.5042981   15.96 15.40 12.22   ~ 717 0
4 QSO B0015+162 QSO 00 18 31.9990789848 +16 29 25.835460180   19 18.26 18.40   ~ 39 0
5 LBQS 0017+0209 QSO 00 20 25.0712387928 +02 26 25.591183296   17 17.5     ~ 25 0
6 QSO J0027+2241 QSO 00 27 15.3715301928 +22 41 58.067953764   16.90 16.57 15.60   ~ 89 1
7 LEDA 1790 Sy1 00 29 13.7012449608 +13 16 03.947778264   15.70 15.41     ~ 444 0
8 QSO B0042+101 BLL 00 44 58.7274656640 +10 26 53.126315376   17.4 18.00 18.1   ~ 38 1
9 QSO B0043+0354 Sy1 00 45 47.2231233240 +04 10 23.386759392   15.88 16.00     ~ 156 0
10 87GB 004432.0+030343 Sy1 00 47 05.9186531064 +03 19 54.784830324   16.2 16.37     ~ 146 2
11 Mrk 1502 Sy1 00 53 34.9331107632 +12 41 35.929269132   14.41 14.03     ~ 1167 1
12 LBQS 0100+0205 QSO 01 03 12.9904808808 +02 21 09.980099388   16.81 16.39     ~ 61 0
13 LBQS 0102-2713 QSO 01 04 41.0003434008 -26 57 07.385601492   17.8       ~ 29 0
14 QSO B0107-156 QSO 01 09 31.5495971784 -15 21 51.650585064     17.5     ~ 21 0
15 QSO J0115-0127 QSO 01 15 17.09995153 -01 27 04.5772562   17 17.235 17.81   ~ 225 1
16 ICRF J011818.4+025805 Sy1 01 18 18.4816422984 +02 58 05.790609192     17.5     ~ 139 1
17 QSO B0117+2118 QSO 01 20 17.2642359528 +21 33 46.197696168     16.1     ~ 127 0
18 ESO 113-45 Sy1 01 23 45.7631533440 -58 48 20.808928944   14.08 13.83 13.34   ~ 880 0
19 QSO J0125-0006 Bla 01 25 28.8438355224 -00 05 55.930595964   16.92 16.64 16.30   ~ 294 1
20 ICRF J013957.3+013146 Sy1 01 39 57.30577668 +01 31 46.1387932   17.12 17.07     ~ 176 1
21 ICRF J020157.1-113233 Sy1 02 01 57.1794759192 -11 32 33.435766068   16.54 16.40 16.073   ~ 215 1
22 4C 10.06 Sy1 02 17 07.6653021240 +11 04 09.877412784     16.46     ~ 104 1
23 4C -04.06 QSO 02 35 07.3418452008 -04 02 05.317096956   16.61 16.46 16.2   ~ 213 1
24 PB 6937 QSO 02 56 16.5307343496 -01 26 38.218679988   17.4 17.00     ~ 38 1
25 QSO B0254-334A QSO 02 56 42.60273236 -33 15 21.2773081     17 19.55   ~ 55 1
26 QSO J0304-2211 QSO 03 04 49.8652311288 -22 11 51.882127548   16.43 16.40     ~ 110 0
27 QSO B0334-3617 QSO 03 36 09.3057606408 -36 07 32.643266592   17.7 16.60 17.4   ~ 17 0
28 6C 033321+320838 Bla 03 36 30.10760267 +32 18 29.3422162     17.50 16.6   ~ 654 1
29 3C 95 Sy1 03 51 28.5673217616 -14 29 08.257870248 15.62 16.55 16.22     ~ 189 1
30 QSO B0355-483 QSO 03 57 21.9179670240 -48 12 15.159541932   16.71 16.38 16.08   ~ 76 1
31 QSO B0403-132A BLL 04 05 34.00339116 -13 08 13.6909309   17.37 17.09 16.6   ~ 358 1
32 PKS 0405-123 Sy1 04 07 48.4309841856 -12 11 36.659928408   15.09 14.86 14.7   ~ 510 1
33 2E 962 Sy1 04 17 16.7842972416 -05 53 45.608035560   16.24 15.94 15.7   ~ 172 1
34 QSO B0420-0127 QSO 04 23 15.80072217 -01 20 33.0656073   17.50 17.00 16.28   ~ 1207 3
35 QSO J0441-4313 QSO 04 41 17.3385563928 -43 13 45.488722116   16.64 16.36 16.54 16.26 ~ 109 1
36 ICRF J045608.9-215909 Sy1 04 56 08.9237717400 -21 59 09.399816312 15.76 16.16 16.10 15.9   ~ 187 1
37 QSO B0454+0356 QSO 04 56 47.1747907776 +04 00 52.946102484   16.76 16.53 16.26   ~ 241 1
38 NAME Pic A Sy1 05 19 49.7229323856 -45 46 43.852662732   15.73 15.77 14.85   ~ 663 1
39 QSO B0537-441 BLL 05 38 50.36155950 -44 05 08.9390233   15.77 16.48 16   ~ 883 2
40 QSO B0624+6907 QSO 06 30 02.5051022520 +69 05 03.913837440   14.64 14.16     ~ 95 0
41 QSO J0635-7516 Bla 06 35 46.5079301472 -75 16 16.816418256   15.96 15.75 15.82   ~ 587 1
42 3C 175 Sy1 07 13 02.4220971768 +11 46 16.269484656   17.06 16.60     ~ 266 2
43 QSO J0743-6726 QSO 07 43 31.6117092000 -67 26 25.547011008   16.71 16.37     ~ 146 1
44 ICRF J074541.6+314256 Sy1 07 45 41.6715742128 +31 42 56.614217508   16.10 15.97     ~ 260 1
45 ICRF J083052.0+241059 Sy1 08 30 52.08619250 +24 10 59.8202919   17.62 17.26 16.30   ~ 529 1
46 Ton 951 Sy1 08 47 42.4485615096 +34 45 04.482515304   14.83 14.50     ~ 466 0
47 LB 8775 QSO 08 51 41.7703796136 +16 12 21.956419620   16.70       ~ 92 0
48 US 1867 Sy1 08 53 34.2440799000 +43 49 02.336647692   17.15 16.91     ~ 102 0
49 QSO J0902-1415 QSO 09 02 16.8308887080 -14 15 30.874458132   16.79 16.59 16.4   ~ 241 1
50 LB 9308 Sy1 09 06 31.8732919056 +16 46 11.785679112   18.48 18.27     ~ 298 3
51 QSO J0909-095 QSO 09 09 30.6 -09 32 22     19.00     ~ 11 0
52 QSO B0916+512 QSO 09 19 57.6059812632 +51 06 09.542294028   16.47 16.41     ~ 65 0
53 ICRF J092703.0+390220 Sy1 09 27 03.01394144 +39 02 20.8518067   17.17 17.00 16.486   ~ 1001 1
54 US 796 QSO 09 38 57.0175740480 +41 28 21.216772452   16.94 16.75     ~ 138 1
55 4C 40.24 QSO 09 48 55.33815103 +40 39 44.5869471   18.31 18.02 17.85   ~ 351 1
56 LEDA 2149945 Sy1 09 50 48.3803143440 +39 26 50.467298496   16.83 16.73     ~ 198 0
57 PG 0953+414 Sy1 09 56 52.3931554992 +41 15 22.211247636 14.710 15.611 15.546 15.294 14.720 ~ 452 0
58 ICRF J095738.1+552257 Sy1 09 57 38.1839604096 +55 22 57.754950636   18.24 17.89     ~ 434 1
59 Ton 469 Sy1 09 58 20.9496221568 +32 24 02.208417372   15.88 15.78 15.51   ~ 425 1
60 Mrk 132 QSO 10 01 29.6441188968 +54 54 38.044314036   16.21 16.02     ~ 132 0
61 ICRF J100306.7+681316 Sy1 10 03 06.7660298016 +68 13 16.811854896   16.28 15.92 15.3   ~ 66 1
62 Ton 28 Sy1 10 04 02.6102134920 +28 55 35.329310688   16.17 15.7     ~ 174 0
63 LEDA 29208 Sy1 10 04 20.1379926888 +05 13 00.400882728   16.73 16.55     ~ 247 1
64 4C 22.26 QSO 10 04 45.7421901264 +22 25 19.268460984   18.94 18.63     ~ 73 1
65 7C 100725.89+414711.00 Sy1 10 10 27.5274498072 +41 32 39.053861232   16.72 16.67     ~ 184 1
66 QSO B1008+1319 QSO 10 11 10.8547987008 +13 04 12.189722736   17.00 16.76     ~ 91 0
67 Ton 1187 Sy1 10 13 03.1814662440 +35 51 23.742391536   15.60 15.42     ~ 89 0
68 LBQS 1026-0045A QSO 10 28 35.0037427272 -01 00 43.827188112   18.23 18.01     ~ 30 0
69 LBQS 1026-0045B QSO 10 28 37.0180551648 -01 00 27.526300632   18.41 18.22     ~ 72 0
70 4C 06.41 BLL 10 41 17.16249940 +06 10 16.9237327   16.86 16.70 16.14   ~ 289 1
71 PG 1049-005 Sy1 10 51 51.4474066944 -00 51 17.707987476   15.98 15.78     ~ 179 0
72 4C 20.24 Bla 10 58 17.9007317832 +19 51 50.872721328   17.51 17.07 17.28   ~ 221 1
73 [OKM2018] SWIFT J1104.8+7689 Sy1 11 04 13.8611496720 +76 58 58.194549084   15.70 15.72 15.40   ~ 543 1
74 ICRF J110715.0+162802 Sy1 11 07 15.0475336176 +16 28 02.244766584   15.91 15.70     ~ 166 1
75 LEDA 34449 Sy1 11 17 06.3989076960 +44 13 33.324039480   16.32 16.12     ~ 247 0
76 LEDA 34570 Sy1 11 18 30.2894794680 +40 25 54.068810952   16.34 16.21     ~ 227 0
77 Ton 1388 Sy1 11 19 08.6786220240 +21 19 17.987085948   14.91 14.80     ~ 466 0
78 4C 12.40 QSO 11 21 29.7579529752 +12 36 17.442426780   18.3 18.09 18.4   ~ 74 1
79 QSO J1130-1449 Bla 11 30 07.0523452128 -14 49 27.388021944   17.17 16.90 16 16.97 ~ 707 1
80 QSO B1130+111 QSO 11 33 30.2985591648 +10 52 23.353505292   16.52 16.45     ~ 59 0
81 NAME Crt A Sy1 11 39 10.7025556152 -13 50 43.639196064   16.38 16.17 16.4   ~ 271 1
82 ICRF J113957.0+654749 Sy1 11 39 57.0254367168 +65 47 49.483232880   16.50 16.32     ~ 518 1
83 LBQS 1138+0204 QSO 11 41 21.7558808064 +01 48 03.557762496   17.87 17.70     ~ 41 0
84 LB 2126 QSO 11 51 20.4599373144 +54 37 33.049962300   16.03 15.78     ~ 155 0
85 LB 2136 Sy1 11 53 24.46663994 +49 31 08.8301372   17.94 17.66     ~ 498 1
86 2MASSI J1159262+210655 Sy1 11 59 26.2069437096 +21 06 55.875844620     17.5     ~ 45 0
87 Ton 599 Sy1 11 59 31.83391383 +29 14 43.8268224   14.80 14.41 17.652 13.39 ~ 925 1
88 QSO J1208+4540 QSO 12 08 58.0107013896 +45 40 35.421692952   16.00 15.70     ~ 189 0
89 PB 3894 Sy1 12 14 17.6738687784 +14 03 13.182723144   14.46 14.19     ~ 821 0
90 LBQS 1214+1804 QSO 12 16 49.0239097632 +17 48 04.675848732     16.7     ~ 32 0
91 4C 64.15 QSO 12 17 40.8259258176 +64 07 07.429930464   18.88 18.42     ~ 60 1
92 PG 1216+069 Sy1 12 19 20.9318278680 +06 38 38.467059252   15.68 15.65     ~ 285 0
93 2MASX J12213795+0430264 Sy1 12 21 37.9340182128 +04 30 26.133853464   18.34 18.00     ~ 52 0
94 Mrk 205 Sy1 12 21 44.0724099888 +75 18 38.241006228   15.64 15.24 14.7   ~ 477 0
95 3C 273 BLL 12 29 06.6998257176 +02 03 08.597629980   13.05 14.830 14.11   ~ 5798 1
96 4C -02.55 QSO 12 32 00.0159535440 -02 24 04.793069304   17.41 17.06 16.4   ~ 432 1
97 LBQS 1230+0947 QSO 12 33 25.7867320896 +09 31 23.363965884   16.79 16.70     ~ 66 0
98 QSO J1244+1721B QSO 12 44 10.8247089768 +17 21 04.508869464   16.40 16.09     ~ 152 1
99 LB 19 QSO 12 50 05.7146863848 +26 31 07.598352000   16.12 15.92     ~ 202 0
100 4C 30.25 QSO 12 50 25.5477425640 +30 16 39.813315240   19.69 19.32     ~ 84 1
101 QSO B1248+401 QSO 12 50 48.3268288080 +39 51 39.458894760   16.62 16.19     ~ 137 0
102 LB 11377 QSO 12 50 50.3196084312 +31 25 53.692128012   18.30 18.05     ~ 35 0
103 LB 11394 QSO 12 52 24.9840140424 +29 13 21.257997780   17.3 17.12     ~ 46 0
104 LB 11408 QSO 12 53 17.5764589992 +31 05 50.628627492   17.20 17.00     ~ 63 0
105 QSO B1252+119 Bla 12 54 38.25561478 +11 41 05.8950431   16.99 16.64 16.76   ~ 272 1
106 3C 279 Bla 12 56 11.16657958 -05 47 21.5251510   18.01 17.75 15.87   ~ 3042 2
107 [B68b] 201 QSO 12 59 48.7852053336 +34 23 22.627553928   17.05 16.79     ~ 100 0
108 A2 330 QSO 13 01 00.8675938440 +28 19 44.741795700   17.60 17.40     ~ 61 0
109 LB 2522 Sy1 13 01 12.9250750776 +59 02 06.693816732   16.04 15.89     ~ 281 0
110 ICRF J130533.0-103319 Sy1 13 05 33.0150535680 -10 33 19.430383680   15.18 15.23 14.46   ~ 577 1
111 3C 281 Sy1 13 07 53.9295304872 +06 42 13.877755920   17.15 17.02     ~ 144 2
112 Ton 1565 Sy1 13 12 17.7526981968 +35 15 21.086467128   15.45 15.64 14.2   ~ 277 1
113 4C 52.27 QSO 13 19 46.1981104392 +51 48 05.778192240   17.35 16.89     ~ 141 1
114 Ton 153 QSO 13 19 56.2320886176 +27 28 08.186323080   16.12 15.98     ~ 153 0
115 Ton 156 QSO 13 21 15.8594008584 +28 47 19.492704528   16.88 16.69     ~ 102 0
116 Ton 157 QSO 13 23 20.5544185368 +29 10 07.108804344   16.91 16.83     ~ 59 0
117 2MASS J13234951+6541480 Sy1 13 23 49.5182430360 +65 41 48.164463600   16.01 15.84     ~ 173 0
118 4C 65.15 QSO 13 25 29.7054429984 +65 15 13.363097472   17.67 17.48     ~ 96 1
119 QSO B1327-2040 QSO 13 30 07.7005132944 -20 56 16.574817732   17.67 17.04     ~ 97 1
120 3C 286 Sy1 13 31 08.2883506368 +30 30 32.960091564   17.51 17.25     ~ 4341 2
121 QSO J1331+4101 QSO 13 31 41.1396131064 +41 01 58.778510304   17.52 17.41     ~ 110 0
122 PB 4007 Sy1 13 36 02.0092074528 +17 25 13.092799188   16.50 16.33     ~ 92 0
123 2XMM J135315.8+634546 Sy1 13 53 15.8311116864 +63 45 45.683126676   14.54 14.28     ~ 385 0
124 7C 1351+3153 QSO 13 54 05.3922907896 +31 39 02.432250180   19.03 18.71     ~ 67 1
125 PB 4142 Sy1 13 54 35.6874184872 +18 05 17.504491992   16.84 16.68     ~ 224 0
126 QSO B1352+0106 QSO 13 54 58.6806746304 +00 52 10.898450652     16.0     ~ 76 0
127 [OKM2018] SWIFT J1357.0+1929 Sy1 13 57 04.4366598768 +19 19 07.371837768   16.33 16.03 15.3   ~ 455 2
128 4C 58.29 QSO 13 58 17.5890449736 +57 52 04.584051048   16.8 17.21 16.5   ~ 105 1
129 2MASS J14041058+0937451 Sy1 14 04 10.5878274072 +09 37 45.312527784   17.93 17.86     ~ 47 0
130 PG 1404+226 Sy1 14 06 21.8900886888 +22 23 46.515550056   16.62 16.42     ~ 234 0
131 QSO J1409+2618 QSO 14 09 23.9085820008 +26 18 21.056458176   16.07 15.74     ~ 191 0
132 LEDA 51016 Sy1 14 17 00.8224797456 +44 56 06.336360024   16.93 16.63     ~ 258 0
133 3C 298.0 QSO 14 19 08.1802187928 +06 28 34.802854680   17.12 16.79     ~ 407 1
134 Ton 202 Sy1 14 27 35.6076948744 +26 32 14.541190476   15.96 16.00     ~ 306 1
135 QSO J1427-1203 QSO 14 27 38.1268790904 -12 03 49.949292420   16.91 16.49 17.19   ~ 74 1
136 2MASS J14294306+4747262 Sy1 14 29 43.0739786592 +47 47 26.217623904   17.29 16.97     ~ 183 0
137 LBQS 1435-0134 QSO 14 37 48.2855255136 -01 47 10.816509804   16.11 15.78 16.39   ~ 80 0
138 Mrk 478 Sy1 14 42 07.4714418744 +35 26 22.938625500   14.91 14.58     ~ 533 0
139 2MASS J14464593+4035057 Sy1 14 46 45.9392259288 +40 35 05.797233636   16.28 16.11     ~ 293 0
140 ICRF J151443.0+365050 Sy1 15 14 43.0683049560 +36 50 50.355436776   17.11 17.01 15.83   ~ 411 1
141 LB 9605 QSO 15 19 13.3574417064 +23 46 57.662641056     18.41     ~ 37 0
142 LB 9612 QSO 15 19 19.4413069176 +23 46 03.346544604   17.65 17.28     ~ 83 0
143 QSO B1521+1009 QSO 15 24 24.5234088744 +09 58 29.087917572   15.74 16.2     ~ 136 0
144 PG 1538+47 Sy1 15 39 34.8103136784 +47 35 31.263874908   16.01 15.81     ~ 98 1
145 QSO B1544+4855 Sy1 15 45 30.2358624864 +48 46 08.976390420   16.92 16.73     ~ 231 0
146 7C 1555+3313 BLL 15 57 29.9416859328 +33 04 46.925419656   18.89 18.64 18.6   ~ 77 1
147 6C 161147+342017 QSO 16 13 41.06424322 +34 12 47.9088535   17.98 17.46 17.07   ~ 642 1
148 2E 3648 Sy1 16 20 21.8185395384 +17 36 23.952361176   16.53 16.41 20.5   ~ 417 2
149 4C 23.43 Sy1 16 24 39.0838297968 +23 45 12.223370412   17.91 17.47     ~ 339 1
150 QSO B1626+5529 Sy1 16 27 56.1123628752 +55 22 31.559061504   15.79 15.68     ~ 213 0
151 QSO B1630+3744 QSO 16 32 01.1117931960 +37 37 49.980505332   16.50 16.30     ~ 175 0
152 QSO B1634+7037 QSO 16 34 28.9917184368 +70 31 32.393436960   14.90 14.66     ~ 268 0
153 ICRF J163813.4+572023 Sy1 16 38 13.45629995 +57 20 23.9789828     16.90 16.94   ~ 359 1
154 NAME Her B Sy1 16 42 58.80997043 +39 48 36.9939552   16.81 16.59 16.84   ~ 1724 2
155 3C 351.0 Sy1 17 04 41.3742408840 +60 44 30.520617000   15.65 15.40 15.30   ~ 757 1
156 QSO J1716+5328 QSO 17 16 35.5677616080 +53 28 15.827676888   16.30 16.48     ~ 69 0
157 QSO J1719+4804 Bla 17 19 38.2496454120 +48 04 12.247659408   15.33 14.60 14.25   ~ 181 1
158 8C 1803+784 BLL 18 00 45.6838528560 +78 28 04.018028016   16.4 15.90 15.46   ~ 740 1
159 ClG 1821+64 ClG 18 21 56.7276 +64 20 55.841           ~ 504 1
160 7C 1821+6419 Sy1 18 21 57.2130271440 +64 20 36.221312076   14.23 14.24     ~ 601 1
161 ICRF J184208.9+794617 Sy1 18 42 08.9904975672 +79 46 17.127835104   16.06 15.38     ~ 1316 0
162 2MASS J21145258+0607423 Sy1 21 14 52.5774985320 +06 07 42.433198104   16.06 15.77     ~ 212 0
163 QSO B2128-123 BLL 21 31 35.2617909696 -12 07 04.795364172   16.33 16.11 15.87   ~ 455 1
164 ICRF J213745.1-143255 Sy1 21 37 45.1959922824 -14 32 55.695508728 15.41 15.63 15.53 15.0   ~ 372 0
165 ICRF J214335.5+174348 Sy1 21 43 35.54456275 +17 43 48.7875890   15.91 15.73 15.17   ~ 389 1
166 4C 06.69 Bla 21 48 05.45866779 +06 57 38.6041877   16.85 16.47 15.06   ~ 676 1
167 QSO B2155-304 BLL 21 58 52.0652249880 -30 13 32.118447792   13.36 13.09 12.62   ~ 1732 1
168 4C 31.63 BLL 22 03 14.9756830008 +31 45 38.269473228   15.85 15.58 14.33   ~ 495 1
169 4C -03.79 QSO 22 18 52.03772044 -03 35 36.8795441   16.93 16.38 16.15   ~ 341 1
170 3C 446 BLL 22 25 47.25929101 -04 57 01.3907626   18.83 18.39 16.3   ~ 830 1
171 4C 11.69 Bla 22 32 36.40890093 +11 43 50.9040592   17.75 17.33     ~ 1119 2
172 QSO J2246-1206 QSO 22 46 18.23197022 -12 06 51.2775983   16.63 16.45 15.99   ~ 283 1
173 3C 454.3 Bla 22 53 57.7480438728 +16 08 53.561508864   16.57 16.10 15.22   ~ 2847 2
174 NAME MR 2251-178 Sy1 22 54 05.8858611984 -17 34 55.402233708   14.99 14.36 15.12   ~ 436 3
175 4C 11.72 BLL 22 54 10.4214226080 +11 36 38.748083760   16.02 15.82     ~ 341 1
176 ICRF J230343.5-680737 Sy1 23 03 43.56459610 -68 07 37.4431119   16.26 16.38 17.68   ~ 83 1
177 QSO B2340-0339 QSO 23 42 56.6002743864 -03 22 26.269675248   16.53 16.02 16.28   ~ 89 1
178 ICRF J234636.8+093045 Sy1 23 46 36.8384562240 +09 30 45.514903032   16.23 15.97 15.99   ~ 320 2
179 QSO J2355-3357 QSO 23 55 25.7961480408 -33 57 55.218632328   18.32 16.4 17.10   ~ 61 1

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