1999MNRAS.308.1096L

Query : 1999MNRAS.308.1096L

1999MNRAS.308.1096L - Mon. Not. R. Astron. Soc., 308, 1096-1116 (1999/October-1)

Optical spectroscopy of two overlapping, flux-density-limited samples of radio sources in the North Ecliptic Cap, selected at 38 and 151 MHz.

LACY M., RAWLINGS S., HILL G.J., BUNKER A.J., RIDGWAY S.E. and STERN D.

Abstract (from CDS):

We present the results of optical spectroscopy of two flux-density-limited samples of radio sources selected at frequencies of 38 and 151MHz in the same region around the North Ecliptic Cap, the 8C-NEC and 7C-iii samples respectively. Both samples are selected at flux density levels ~20 times fainter than samples based on the 3C catalogue. They are amongst the first low-frequency selected samples with no spectral or angular size selection for which almost complete redshift information has been obtained, and contain many of the lowest-luminosity z>2 radio galaxies so far discovered. They will therefore provide a valuable resource for understanding the cosmic evolution of radio sources and their hosts and environments. The 151-MHz 7C-iii sample is selected to have S151≥0.5Jy and is the more spectroscopically complete; out of 54 radio sources fairly reliable redshifts have been obtained for 44 objects. The 8C sample has a flux limit of S38≥1.3Jy and contains 58 sources of which 46 have fairly reliable redshifts. We discuss possible biases in the observed redshift distribution, and some interesting individual objects, including a number of cases of probable gravitational lensing. Using the 8C-NEC and 7C-iii samples in conjunction, we form the first sample selected on low-frequency flux in the rest-frame of the source, rather than the usual selection on flux density in the observed frame. This allows us to remove the bias associated with an increasing rest-frame selection frequency with redshift. We investigate the difference this selection makes to correlations of radio source properties with redshift and luminosity by comparing the results from traditional flux-density selection with our new method. We show in particular that flux-density-based selection leads to an overestimate of the steepness of the correlation of radio source size with redshift.

Abstract Copyright: 1999, Royal Astronomical Society

Journal keyword(s): galaxies: active - galaxies: evolution - gravitational lensing - radio continuum: galaxies

Simbad objects: 158

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Number of rows : 158
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 3C 6.1 BLL 00 16 31.12832880 +79 16 50.1722040   22       ~ 129 1
2 3C 9 BLL 00 20 25.2231670656 +15 40 54.774271884   17.92 17.62     ~ 347 1
3 3C 20 Sy2 00 43 09.18053760 +52 03 36.1486440   19.0       ~ 221 1
4 3C 28 rG 00 55 50.583 +26 24 36.68   18.63 19.57 16.26   ~ 213 1
5 2C 94 Sy2 01 08 52.8701830824 +13 20 14.262799812   15.19       ~ 494 2
6 8C 0106+729 Sy1 01 09 44.2610635193 +73 11 57.121454897   19.5       ~ 155 1
7 3C 34.0 rG 01 10 18.665 +31 47 20.48   21       ~ 177 2
8 3C 35 QSO 01 12 02.2561727808 +49 28 34.990660524     15.6     ~ 146 0
9 2E 437 Sy1 01 36 24.4208152464 +20 57 27.522990972   18.15 18.10     ~ 367 2
10 3C 55.0 rG 01 57 10.730 +28 51 39.85   20.8       ~ 156 1
11 3C 61.1 Sy2 02 23 13.4857575951 +86 19 13.422392083     19.0     ~ 210 1
12 3C 68.2 rG 02 34 23.855 +31 34 17.48   24       ~ 139 1
13 3C 79.0 Sy2 03 10 00.0936589848 +17 05 58.599361932   19.54 18.75     ~ 268 3
14 2C 349 Sy2 03 58 54.4370049840 +10 26 02.791855968   16.68 15.41     ~ 356 2
15 ICRF J041340.3+111214 Sy2 04 13 40.34100355 +11 12 14.7860055   18.96 18.01     ~ 334 1
16 NAME Per B SyG 04 37 04.37535450 +29 40 13.8179631   21.7       ~ 533 2
17 3C 132 rG 04 56 42.922 +22 49 23.06   18.5       ~ 157 1
18 ICRF J054236.1+495107 Sy1 05 42 36.13789710 +49 51 07.2337139   18.45 17.80 17.210   ~ 1573 1
19 2C 524 Sy2 06 09 32.701768 +48 04 17.04207   21.198 18.00 18.767   ~ 182 1
20 3C 172 rG 07 02 08.30458800 +25 13 53.5192680   20.5       ~ 121 1
21 3C 173.1 rG 07 09 18.2015614632 +74 49 31.815420780   19.982 18.9 17.540   ~ 138 1
22 3C 175 Sy1 07 13 02.4220971768 +11 46 16.269484656   17.06 16.60     ~ 269 3
23 3C 184 rG 07 39 24.465 +70 23 10.91   21.5       ~ 140 1
24 3C 184.1 Sy2 07 43 01.3778005643 +80 26 26.042651834     17.0     ~ 190 1
25 3C 186 QSO 07 44 17.4720658920 +37 53 17.250697320   17.5 18.14 17.2   ~ 339 1
26 4C 56.16 rG 07 49 48.077 +55 54 19.45           ~ 176 1
27 2XMM J080535.0+240951 Sy2 08 05 35.0054956728 +24 09 50.330022516   15.46       ~ 336 1
28 3C 196 Sy1 08 13 36.0561170112 +48 13 02.644966020   18.36 17.79     ~ 578 2
29 3C 200 rG 08 27 25.38019 +29 18 44.9601   20       ~ 178 1
30 3C 204 QSO 08 37 45.0013678200 +65 13 35.305376376   18.76 18.21     ~ 184 1
31 3C 207.0 Bla 08 40 47.58842599 +13 12 23.5637506   18.58 18.15 17.622   ~ 455 1
32 3C 208 QSO 08 53 08.6093021736 +13 52 54.845406984   17.76 17.42     ~ 257 1
33 3C 216.0 Bla 09 09 33.49714902 +42 53 46.4821036   19.98 19.42 18.220   ~ 520 1
34 3C 219 Sy1 09 21 08.6258123424 +45 38 57.358202856   19.56 18.69     ~ 424 2
35 3C 220.1 BLL 09 32 39.98061600 +79 06 29.9226600   20.5       ~ 138 1
36 3C 220.3 rG 09 39 23.43 +83 15 26.2   20.5   20.140   ~ 98 1
37 3C 223.0 Sy2 09 39 52.7594046216 +35 53 58.922078496   19.51 18.60     ~ 279 0
38 4C 36.16 Rad 09 39 55.08 +35 52 13.4           ~ 271 1
39 3C 225 rG 09 42 15.38702 +13 45 50.4653   19 20.0     ~ 147 2
40 3C 226.0 Sy1 09 44 16.51944 +09 46 16.9068   19.5       ~ 131 2
41 4C 73.08 Sy2 09 49 45.967 +73 14 23.25   16.00   11.7   ~ 127 0
42 3C 228 QSO 09 50 10.793 +14 20 00.70   21       ~ 180 2
43 7C 095855.9+290131 Sy2 10 01 49.5227371368 +28 47 08.943487440   18.21 17.27     ~ 447 1
44 3C 239 rG 10 11 45.639 +46 28 20.45   22.5       ~ 158 1
45 3C 244.1 QSO 10 33 33.9860997312 +58 14 35.611906344   19.0 19.0     ~ 191 1
46 [OKM2018] SWIFT J1104.8+7689 Sy1 11 04 13.8611496720 +76 58 58.194549084   15.70 15.72 15.40   ~ 564 1
47 3C 252.0 rG 11 11 31.960 +35 40 44.64   22       ~ 127 1
48 3C 254 QSO 11 14 38.7251836992 +40 37 20.329281156   17.62 17.42     ~ 331 2
49 ICRF J113957.0+654749 Sy1 11 39 57.0254367168 +65 47 49.483232880   16.50 16.32     ~ 528 1
50 3C 263.1 QSO 11 43 25.083 +22 06 56.08   20       ~ 148 1
51 3C 265.0 Sy1 11 45 28.95577 +31 33 47.2434   20.0       ~ 250 1
52 3C 267 rG 11 49 56.526 +12 47 18.95   22.5       ~ 158 2
53 3C 268.1 rG 12 00 20.53 +73 00 45.7   22       ~ 149 1
54 3C 274.1 rG 12 35 22.97 +21 20 18.3   20       ~ 144 0
55 ICRF J124357.6+162253 Sy1 12 43 57.6491122968 +16 22 53.395049244   19.23 19.00     ~ 321 1
56 3C 277.2 Sy1 12 53 32.425 +15 42 25.29   21.5       ~ 152 1
57 7C 125441.29+473632.00 SyG 12 56 57.485 +47 20 20.23   22.0       ~ 285 1
58 [HB91] 1349+647 rG 13 50 41.84067 +64 29 35.7682     20.70 21.1   ~ 87 1
59 Z 162-21 BLL 13 52 17.8719816576 +31 26 46.487381604   16.10 15.10     ~ 502 3
60 3C 294 rG 14 06 44.317 +34 11 30.19           ~ 234 1
61 3C 295 Sy1 14 11 20.6 +52 12 09   22.34 20.80 18.54   ~ 1021 4
62 3C 300 Sy2 14 22 59.85648 +19 35 36.7152   19.66 18.73     ~ 206 2
63 3C 309.1 Bla 14 59 07.58390804 +71 40 19.8668093   17.24 16.78 17.2   ~ 509 1
64 VV 204 SyG 15 04 57.1195361592 +26 00 58.455780156   15.24       ~ 299 1
65 3C 319.0 rG 15 24 05.499 +54 28 14.64   18.5       ~ 154 1
66 3C 321 Sy1 15 31 43.46520 +24 04 18.9948   16.0   15.40   ~ 341 1
67 3C 324.0 Sy1 15 49 49.170 +21 25 39.50   21.5       ~ 312 1
68 7C 154914.09+625020.00 QSO 15 49 59.206 +62 41 18.31   21.92 20.70     ~ 147 2
69 2MASX J15520913+2005477 G 15 52 09.1120432368 +20 05 48.211598760   17.87 17.08     ~ 145 1
70 2MASX J15520920+2005237 SyG 15 52 09.1938375312 +20 05 23.180614152   17.87 17.08     ~ 129 2
71 3C 326 Rad 15 52 24.9 +20 05 57   17.87 17.08     ~ 226 3
72 NAME 3C 330G2 Sy2 16 09 34.92456720 +65 56 37.8351240   20.33       ~ 280 1
73 2E 3648 Sy1 16 20 21.8185395384 +17 36 23.952361176   16.53 16.41 20.5   ~ 425 2
74 3C 349 rG 16 59 32.079 +47 02 16.56   19 19.0     ~ 163 1
75 8C 1704+608 Bla 17 04 41.3742408840 +60 44 30.520617000   15.65 15.40 15.30   ~ 782 1
76 7C 1731+6641 rG 17 31 44.4 +66 38 57           ~ 6 0
77 7C 1732+6715 Rad 17 32 47.6 +67 13 59           ~ 3 0
78 4C 65.21 QSO 17 32 53.9951151408 +65 33 25.213571388   17.71 17.38     ~ 36 1
79 7C 1733+6719 rG 17 32 54.7 +67 17 36           ~ 6 0
80 NVSS J173637+650232 rG 17 36 37.60 +65 02 35.2           ~ 12 1
81 7C 173643.90+671017.00 Rad 17 36 39.9 +67 08 35           ~ 4 0
82 NVSS J174042+663844 rG 17 40 42.3637 +66 38 43.856           ~ 13 1
83 NVSS J174107+670314 rG 17 41 07.244 +67 03 13.16           ~ 9 1
84 7C 1742+6346 Rad 17 43 04.7 +63 45 09           ~ 4 0
85 7C 1743+6344 rG 17 43 23.096 +63 42 58.62           ~ 5 0
86 NVSS J174339+643019 rG 17 43 42.58 +64 30 18.9           ~ 10 1
87 NVSS J174356+663815 rG 17 43 57.0221182584 +66 38 13.912749996           ~ 11 1
88 87GB 174504.4+641541 Sy2 17 45 22.50 +64 14 24.5           ~ 14 1
89 7C 174556.60+662415.00 Rad 17 45 57.8 +66 23 14           ~ 5 0
90 ICRF J174606.6+642149 SyG 17 46 06.67804118 +64 21 49.6602105           ~ 25 1
91 4C 65.22 QSO 17 47 13.90970 +65 32 35.5909     21.2     ~ 23 1
92 4C 67.27 rG 17 48 09.32 +67 03 03.5           ~ 12 1
93 7C 174817.40+665716.00 Rad 17 48 14.4 +66 56 25           ~ 4 0
94 7C 1748+6731 rG 17 48 43.242 +67 30 45.20           ~ 7 0
95 8C 1751+681C Rad 17 50 22.522 +68 04 52.64           ~ 3 0
96 7C 1751+6809 rG 17 50 49.859 +68 08 25.97           ~ 15 0
97 NVSS J175054+674115 rG 17 50 53.66 +67 41 15.3           ~ 6 1
98 NVSS J175152+645431 Rad 17 51 53.223 +64 54 33.07           ~ 9 1
99 NVSS J175331+662724 Rad 17 53 31.46 +66 27 24.7           ~ 7 1
100 NVSS J175335+631048 rG 17 53 35.206 +63 10 48.84           ~ 15 1
101 7C 1753+6543 BLL 17 53 42.0952032408 +65 42 39.792077460     17.4     ~ 23 1
102 NVSS J175426+642010 rG 17 54 26.77208 +64 20 11.8548           ~ 10 1
103 8C 1754+631 QSO 17 54 58.693 +63 10 54.64     21.10     ~ 7 0
104 7C 1755+6830 Rad 17 55 38.00 +68 32 12.9           ~ 10 0
105 NVSS J175557+631411 Rad 17 55 57.897 +63 14 10.53           ~ 8 1
106 NVSS J175705+651953 rG 17 57 05.26 +65 19 53.2           ~ 30 2
107 NVSS J175744+674111 rG 17 57 43.93 +67 41 12.4           ~ 10 1
108 BWE 1758+6535 Rad 17 58 18.20 +65 35 09.5           ~ 10 0
109 NVSS J175827+655457 rG 17 58 31.38 +65 53 58.2           ~ 7 1
110 NVSS J175847+671948 rG 17 58 47.337 +67 19 46.22           ~ 12 1
111 7C 175835.10+630755.00 QSO 17 58 57.065 +63 07 48.62     21.10     ~ 12 1
112 7C 1801+6902 QSO 18 01 14.6349395592 +69 02 43.771807248     19.4     ~ 22 1
113 4C 13.66 rG 18 01 38.956 +13 51 23.87           ~ 51 1
114 NVSS J180221+645646 rG 18 02 21.218 +64 56 46.92           ~ 13 1
115 8C 1803+661 rG 18 03 50.851 +66 05 19.02           ~ 12 0
116 7C 1804+6625 QSO 18 04 37.0891964976 +66 25 30.552734676     20.20     ~ 12 1
117 3C 368.0 rG 18 05 06.358 +11 01 32.55   21.5       ~ 253 1
118 NVSS J180512+631335 Rad 18 05 12.596 +63 13 34.46           ~ 9 1
119 NVSS J180556+633313 rG 18 05 57.100 +63 33 13.93           ~ 21 1
120 NVSS J180650+683139 rG 18 06 50.283 +68 31 40.10           ~ 14 1
121 NVSS J180713+671943 rG 18 07 13.38 +67 19 42.0           ~ 11 1
122 NVSS J180729+684155 rG 18 07 29.98 +68 41 55.1           ~ 11 1
123 8C 1808+677 rG 18 07 48.553 +67 44 05.78           ~ 3 0
124 GB6 B1811+6322 rG 18 11 54.73 +63 22 50.3           ~ 8 1
125 NVSS J181203+681457 Rad 18 12 02.66 +68 14 56.2           ~ 8 1
126 7C 181302.70+684641.00 QSO 18 12 44.2211877336 +68 47 35.500328844     19.70     ~ 19 1
127 7C 1813+6439 QSO 18 13 56.029 +64 40 47.83     22.00     ~ 13 1
128 NVSS J181412+670344 rG 18 14 12.662 +67 03 43.25       24.1   ~ 14 1
129 8C 1814+657 QSO 18 14 34.6955387568 +65 51 29.525844996     20.0     ~ 7 0
130 7C 1814+6529 Rad 18 15 06.1 +65 30 51           ~ 3 0
131 4C 68.20 BLL 18 15 24.9541911552 +68 06 31.984676424     14.43     ~ 25 1
132 7C 1815+6815 Rad 18 15 28.932 +68 18 33.00           ~ 8 0
133 4C 67.28 rG 18 16 26.109 +67 12 10.61           ~ 12 1
134 NVSS J181658+660617 rG 18 16 58.406 +66 06 17.58           ~ 11 1
135 NVSS J181934+655155 rG 18 19 34.671 +65 51 54.21           ~ 10 1
136 NVSS J182037+665842 Rad 18 20 37.36 +66 58 41.8           ~ 7 1
137 7C 182105.40+644201.00 Rad 18 21 18.4 +64 43 34           ~ 3 0
138 8C 1821+643B rG 18 21 54.95945 +64 21 17.2976   19.0       ~ 10 0
139 ClG 1821+64 ClG 18 21 56.7276 +64 20 55.841           ~ 511 1
140 7C 1821+6419 Sy1 18 21 57.2130271440 +64 20 36.221312076   14.23 14.24     ~ 632 1
141 NVSS J182303+660328 rG 18 23 03.441 +66 03 27.42           ~ 9 1
142 7C 1825+6602 Rad 18 25 51.633 +66 04 16.10           ~ 6 0
143 ICRF J182637.5+670644 Sy1 18 26 37.5371597040 +67 06 44.713380096     17.70     ~ 28 1
144 NVSS J182641+651244 rG 18 26 41.263 +65 12 43.44           ~ 11 1
145 NVSS J182725+671151 rG 18 27 23.597 +67 12 07.95           ~ 9 1
146 7C 182759.40+651744.00 Rad 18 28 08.9 +65 19 46           ~ 3 0
147 2C 1569 Bla 18 29 31.7809732968 +48 44 46.160168892   17.05 16.81 16.860   ~ 713 1
148 3C 381.0 Sy2 18 33 46.2946146576 +47 27 02.566037088   18.64 17.24     ~ 209 1
149 Z 173-14 Sy1 18 35 03.3896172576 +32 41 46.855964616   16.50 15.39 10.50   ~ 688 1
150 3C 390.3 Bla 18 42 08.9904975672 +79 46 17.127835104   16.06 15.38     ~ 1381 1
151 3C 388.0 SyG 18 44 02.3840387736 +45 33 29.628672300   16.91 15.56     ~ 338 1
152 3C 401 SyG 19 40 25.116 +60 41 34.97   19.1       ~ 206 1
153 3C 427.1 rG 21 04 06.87480 +76 33 10.2231   23.3 21.1     ~ 157 1
154 3C 436 Sy2 21 44 11.7308886192 +28 10 18.750481356   18.5       ~ 196 1
155 2C 1820 SyG 21 55 52.324 +38 00 28.51   19.20       ~ 234 1
156 NGC 7237 SyG 22 14 46.885 +13 50 27.13   15       ~ 100 1
157 3C 452 Sy2 22 45 48.7616172744 +39 41 15.906782184   17.60 16.56     ~ 391 1
158 3C 457 QSO 23 12 07.590 +18 45 41.51   19.5       ~ 95 1

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