Most of the earlier multifrequency spectra results were obtained by combining measurements carried out quasi-simultaneously (over a period of one or more months) at radio and shorter wavelengths, using several telescopes on some samples of tens of objects, selected by various criteria. For example, we refer to the measurements of 19 active extragalactic sources from 20 cm to 1400 Å by Landau et al. 1986). Valtaoja et al. (1988) investigated quiescent spectra for a sample of 27 radio sources observed at centimeter and millimeter wavelengths. Gear et al. (1994) compared quasi-simultaneous 5-375 GHz spectra of 22 BL Lacertae objects with 24 radio-loud, violently variable quasars. Kühr et al. (1981) compiled radio measurements at more than two frequencies for 494 sources from the combined NRAO-MPI 5 GHz Strong Source Surveys and the Parkes 2.7 GHz Surveys. Herbig & Readhead (1992) composed non-simultaneous radio data from 10 MHz to 100 GHz on a complete sample of 256 objects. We also refer to papers, cited in the O'Dea (1998) survey of compact steep-spectrum and gigahertz peaked-spectrum sources, as well as a number of other works.
| IAU | Other | OI | Z | IAU | Other | OI | Z | IAU | Other | OI | Z |
| 0003+38 | G | 0.229 | 0159-11 | 3C 57 | Q | 0.669 | 0420-01 | OA 129 | Q | 0.915 | |
| 0003-06 | NRAO 5 | BL | 0.347 | 0201+11 | OD 101 | Q | 3.56 | 0421+01 | OF 36 | Q | 2.055 |
| 0005-23 | Q | 1.410 | 0202+14 | NRAO 91 | G | 0.405 | 0422+00 | OF 38 | BL | ||
| 0005-26 | OB -210 | G | 0202+31 | Q | 1.466 | 0423+23 | RS | ||||
| 0007+10 | III Zw 2 | G | 0.090 | 0202-17 | Q | 1.740 | 0423+05 | Q | 1.333 | ||
| 0007+17 | 4C 17.04 | Q | 1.601 | 0211+17 | Q | 0.472 | 0425+04 | OF 42 | Q | ||
| 0008-26 | OB -214 | Q | 1.093 | 0216+01 | Q | 1.623 | 0428+20 | OF 247 | G | 0.219 | |
| 0010+40 | 4C 40.01 | Q | 0.256 | 0217-18 | Q | 0429+41 | 3C 119 | Q | 1.023 | ||
| 0011-04 | Q | 0219+42 | 3C 66A | BL | 0.444 | 0430+05 | 3C 120 | G | 0.033 | ||
| 0012+31 | 3C 6 | G | 0219-16 | Q | 0.698 | 0434-18 | Q | 2.702 | |||
| 0013-00 | Q | 1.574 | 0221+06 | 4C 06.11 | Q | 0.511 | 0440-00 | NRAO 190 | Q | 0.844 | |
| 0019+05 | OB 34 | BL | 0223+34 | 4C 34.07 | Q | 0446+11 | G | 1.207 | |||
| 0022+39 | OA 26 | Q | 1.946 | 0226-03 | 4C -03.07 | Q | 2.066 | 0451-28 | OF -285 | Q | 2.560 |
| 0024+34 | OB 338 | G | 0.333 | 0229+13 | 4C 13.14 | Q | 2.065 | 0454+03 | OF 92 | Q | 1.349 |
| 0026+34 | OB 343 | G | 0.6 | 0234+28 | CTD 20 | Q | 1.207 | 0454+06 | 4C 06.21 | G | 0.405 |
| 0027+05 | Q | 0235+16 | OD 160 | BL | 0.940 | 0454-23 | OF -292 | Q | 1.003 | ||
| 0035+23 | CTD 5 | Q | 2.27 | 0237-02 | Q | 1.116 | 0456+06 | OF 94 | Q | 1.08 | |
| 0035+12 | 4C 12.05 | Q | 1.395 | 0237+04 | OD 62 | Q | 0.978 | 0457+02 | OF 97 | Q | 2.384 |
| 0035-02 | 3C 17 | G | 0.220 | 0237-23 | OD -263 | Q | 2.225 | 0458-02 | DA 157 | Q | 2.286 |
| 0038-02 | Q | 1.176 | 0238-08 | NGC 1052 | G | 0.005 | 0458+13 | RS | |||
| 0047+02 | OB 78 | BL | 0239+10 | OD 166 | Q | 0459+06 | OF 99.3 | Q | 1.106 | ||
| 0048-09 | OB -80 | BL | 0240-21 | OD -267 | Q | 0.314 | 0459+13 | BL | |||
| 0048-07 | OB -82 | Q | 1.975 | 0248+43 | Q | 1.310 | 0459+25 | 3C 133 | G | 0.277 | |
| 0054-00 | Q | 2.795 | 0250+17 | Q | 0500+01 | OG 3 | Q | 0.585 | |||
| 0055+30 | NGC 315 | G | 0.016 | 0256+07 | OD 94.7 | Q | 0.893 | 0502+04 | OG 5 | Q | 0.954 |
| 0055-05 | Q | 0301+33 | 4C 33.06 | G | 0507+17 | G | 0.416 | ||||
| 0056-00 | DA 32 | Q | 0.717 | 0306+10 | OE 110 | Q | 0.863 | 0509+15 | RS | ||
| 0106+01 | 4C 01.02 | Q | 2.107 | 0309+41 | NRAO 128 | G | 0.136 | 0511-22 | OG -220 | Q | 1.296 |
| 0108-07 | OC -14 | Q | 1.776 | 0312+10 | 4C 10.10 | G | 0514-16 | OG -123 | Q | 1.270 | |
| 0108+38 | OC 314 | G | 0.668 | 0316+16 | CTA 21 | Q | 0518+16 | 3C 138 | Q | 0.759 | |
| 0109+22 | BL | 0316+41 | 3C 84 | G | 0.017 | 0521-26 | OG -236 | RS | |||
| 0110+31 | NRAO 62 | Q | 0.603 | 0317+18 | OE 129 | G | 0528-25 | OG -247 | Q | 2.765 | |
| 0111+02 | UGC 773 | G | 0.047 | 0319+12 | OE 131 | Q | 2.67 | 0528+13 | OG 147 | Q | 2.07 |
| 0112-01 | Q | 1.365 | 0322+22 | RS | 0537-15 | Q | 0.947 | ||||
| 0113-11 | Q | 0.672 | 0326+27 | Q | 1.533 | 0537-28 | OG -263 | Q | 3.104 | ||
| 0116+08 | 4C 08.06 | G | 0.594 | 0327-24 | OE -246.3 | Q | 0.888 | 0552+39 | DA 193 | Q | 2.365 |
| 0118-27 | OC -230.4 | BL | >0.557 | 0329-25 | OE -248 | Q | 2.685 | 0555-13 | Q | ||
| 0119+11 | Q | 0.570 | 0333+32 | NRAO 140 | Q | 1.259 | 0601+24 | 4C 24.11 | RS | ||
| 0119+04 | OC 33 | Q | 0.637 | 0336-01 | CTA 26 | Q | 0.852 | 0602+40 | OH 404.1 | RS | |
| 0119+24 | Q | 2.025 | 0338-21 | OE -263.9 | BL | 0605-08 | OH -10 | Q | 0.872 | ||
| 0122-00 | Q | 1.070 | 0340+36 | OE 367 | Q | 1.484 | 0606-22 | OH -212 | Q | 1.926 | |
| 0123+25 | 4C 25.05 | Q | 2.364 | 0344+19 | RS | 0607-15 | OH -112 | Q | 0.324 | ||
| 0127+14 | 4C 14.06 | Q | 0346-16 | Q | 0610+26 | 3C 154 | Q | 0.580 | |||
| 0130-17 | Q | 1.020 | 0348-12 | OE -182 | Q | 1.520 | 0611+13c | ||||
| 0133-20 | OC -255.3 | Q | 1.141 | 0400+25 | CTD 26 | Q | 2.109 | 0618-25 | OH -230 | Q | 1.90 |
| 0134+32 | 3C 48 | Q | 0.367 | 0402+37 | 4C 37.11 | G | 0.054 | 0620+38 | OH 335 | Q | 3.469 |
| 0135-24 | OC -259 | Q | 0.831 | 0403-13 | OF -105 | Q | 0.571 | 0641+39 | OH 368.8 | Q | 1.266 |
| 0136+17 | Q | 2.716 | 0405-12 | OF -109 | Q | 0.574 | 0642+21 | 3C 166 | G | 0.245 | |
| 0138-09 | OC -65 | BL | >0.501 | 0406+12 | BL | 1.02 | 0650+37 | Q | 1.982 | ||
| 0142-27 | OC -270 | Q | 1.157 | 0406-12 | OF -111 | Q | 1.563 | 0653-03 | OH -90 | Q | |
| 0144+20 | RS | 0409+22 | 3C 108 | Q | 1.213 | 0711+35 | OI 318 | Q | 1.620 | ||
| 0146+05 | OC 79 | Q | 2.345 | 0410+11 | 3C 109 | G | 0.306 | 0722+14 | 4C 14.23 | Q | |
| 0147+18 | OC 178 | Q | 0413-21 | Q | 0.807 | 0723-00 | OI -39 | BL | 0.127 | ||
| 0148+27 | Q | 1.26 | 0414-18 | Q | 1.536 | 0727+40 | OI 446 | Q | 2.501 | ||
| 0149+21 | Q | 1.32 | 0415+37b | 3C 111 | G | 0.048 | 0727-11 | RS | |||
| 0149+33 | OC 383 | Q | 2.431 | 0420+02 | BL | 0729+25 | Q | ||||
| 0156-14a | RS | 0420+41 | 4C 41.11 | RS | 0733+30 | RS |
| IAU | Other | OI | Z | IAU | Other | OI | Z | IAU | Other | OI | Z |
| 0733-17 | RS | 0953+25 | OK 290 | Q | 0.712 | 1148-17 | OM -181 | Q | 1.751 | ||
| 0733+26 | RS | 0955+32 | 3C 232 | Q | 0.530 | 1156-22 | G | 0.565 | |||
| 0735+17 | OI 158 | BL | >0.424 | 1004-01 | Q | 1.214 | 1156-09 | OM -94 | RS | ||
| 0736-06 | OI -61 | Q | 1.901 | 1004+14 | OL 108.1 | Q | 2.707 | 1156+29 | 4C 29.45 | Q | 0.729 |
| 0736+01 | OI 61 | Q | 0.191 | 1008-01 | 4C -01.21 | Q | 0.887 | 1157-21 | Q | 0.927 | |
| 0738+31 | OI 363 | Q | 0.630 | 1010+35 | OL 318 | Q | 1.414 | 1200-05 | ON -1 | Q | 0.381 |
| 0738+27 | RS | 1012+23 | 4C 23.24 | Q | 0.565 | 1200+04 | RS | ||||
| 0742+31 | 4C 31.30 | Q | 0.462 | 1013+20 | OL 224 | Q | 3.11 | 1202-26 | Q | 0.790 | |
| 0742+10 | OI 471 | RS | 1015+35 | OL 326 | Q | 1.226 | 1204+28 | ON 208 | Q | 2.177 | |
| 0743-00 | 4C -00.28 | Q | 0.994 | 1018+34 | OL 331 | Q | 1.400 | 1210+13 | 4C 13.46 | Q | 1.137 |
| 0743+25 | RS | 1019+42 | RS | 1211+33 | ON 319 | Q | 1.598 | ||||
| 0743+27 | RS | 1019+30 | OL 333 | Q | 1.319 | 1213-17 | ON -122 | G | |||
| 0745+24 | OI 275 | Q | 0.409 | 1020-10 | OL -133 | Q | 0.197 | 1213+35 | 4C 35.28 | Q | 0.857 |
| 0748+12 | OI 280 | Q | 0.889 | 1020+19 | OL 133 | Q | 2.136 | 1215+30 | ON 325 | BL | 0.237 |
| 0748+33 | OI 380 | Q | 1.932 | 1020+40 | 4C 40.25 | Q | 1.254 | 1216-01 | Q | 0.415 | |
| 0752-11 | OI -187 | RS | 1021-00 | Q | 2.552 | 1217+02 | ON 29 | Q | 0.240 | ||
| 0754+10 | OI 90.4 | BL | 0.66 | 1022+19 | 4C 19.34 | Q | 0.828 | 1218+33 | 3C 270.1 | Q | 1.519 |
| 0759+18 | Q | 1030+41 | Q | 1.120 | 1218-02 | 4C -02.53 | G | 0.665 | |||
| 0802+21 | RS | 1030+39 | Q | 1.095 | 1219+28 | ON 231 | BL | 0.102 | |||
| 0805+41 | Q | 1.420 | 1032-19 | Q | 2.198 | 1219+04 | 4C 04.42 | Q | 0.965 | ||
| 0805+26 | RS | 1034-05 | OL -257 | G | 1222+03 | 4C 03.23 | Q | 0.960 | |||
| 0805-07 | Q | 1.837 | 1034-29 | OL -259 | Q | 0.312 | 1222+21 | 4C 21.35 | Q | 0.435 | |
| 0808+01 | OJ 14 | BL | 1036-15 | OL -161 | G | 0.525 | 1225+36 | ON 343 | Q | 1.975 | |
| 0812+36 | OJ 320 | Q | 1.025 | 1038+06 | 4C 06.41 | Q | 1.265 | 1226+02 | 3C 273 | Q | 0.158 |
| 0812+02 | 4C 02.23 | Q | 0.402 | 1040+12 | 3C 245 | Q | 1.028 | 1228+12b | 3C 274 | G | 0.004 |
| 0814+42 | OJ 425 | BL | 1042+07 | G | 0.698 | 1228-11 | ON -147 | Q | 3.528 | ||
| 0818-12 | OJ -131 | BL | 1045-18 | OL -176 | Q | 0.595 | 1236+07 | G | 0.400 | ||
| 0820+22 | 4C 22.21 | BL | 0.951 | 1046-02 | 4C -02.43 | RS | 1237-10 | ON -162 | Q | 0.750 | |
| 0820+29 | OJ 234 | Q | 2.368 | 1054+00 | OL 91 | RS | 1240+38 | Q | 1.316 | ||
| 0821+39 | 4C 39.23 | Q | 1.216 | 1055+20 | 4C 20.24 | Q | 1.11 | 1240-29 | Q | 1.133 | |
| 0823+03 | OJ 38 | BL | 0.506 | 1055+01 | OL 93 | Q | 0.888 | 1243-07 | ON -73 | Q | 1.286 |
| 0827+24 | OJ 248 | Q | 0.941 | 1058+39 | RS | 1244-25 | Q | 0.638 | |||
| 0829+04 | OJ 49 | BL | 0.180 | 1100+22 | OM 201 | RS | 1252+11 | ON 187 | Q | 0.870 | |
| 0830+42 | OJ 451 | Q | 0.253 | 1101+38 | Mark 421 | BL | 0.031 | 1253-05 | 3C 279 | Q | 0.538 |
| 0834+25 | OJ 259 | Q | 1.122 | 1102-24 | OM -204 | Q | 1.666 | 1255+32 | ON 393 | RS | |
| 0837+03 | Q | 1.57 | 1104+16 | 4C 16.30 | Q | 0.632 | 1256-220 | ON -293.9 | Q | 1.306 | |
| 0838+13 | 3C 207 | Q | 0.684 | 1106+38 | G | 2.290 | 1256-229 | Q | 1.365 | ||
| 0839+18 | Q | 1.272 | 1109+35 | RS | 1257+14 | OW 197 | Q | ||||
| 0851+07 | RS | 1110-21 | OM -218 | RS | 1302-03 | Q | 1.250 | ||||
| 0851+20 | OJ 287 | BL | 0.306 | 1111+14 | OM 118 | Q | 0.869 | 1302-10 | OP -106 | Q | 0.286 |
| 0854+21 | RS | 1116+12 | 4C 12.39 | Q | 2.118 | 1308+32 | OP 313 | BL | 0.997 | ||
| 0855+14 | 3C 212 | Q | 1.043 | 1119+18 | OM 133 | Q | 1.040 | 1308+14 | OP 114 | Q | |
| 0859-14 | OJ -199 | Q | 1.339 | 1120-27 | OM -234 | RS | 1315+34 | OP 326 | Q | 1.050 | |
| 0900+42 | 4C 42.28 | G | 1123+26 | CTD 74 | Q | 2.341 | 1317-00 | 4C -00.50 | Q | 0.892 | |
| 0906+43 | 3C 216 | Q | 0.670 | 1124-18 | Q | 1.048 | 1318-26 | Q | 2.027 | ||
| 0906+01 | DA 263 | Q | 1.018 | 1127-14 | OM -146 | Q | 1.187 | 1330+02 | 3C 287.1 | G | 0.215 |
| 0912+02 | G | 0.427 | 1128+38 | Q | 1.733 | 1331+17 | OP 151 | Q | 2.084 | ||
| 0912+29 | OK 222 | BL | 1128-04 | OM -48 | G | 0.266 | 1334-12 | OP -158.3 | Q | 0.539 | |
| 0913+39 | 4C 38.28 | Q | 1.269 | 1130+00 | Q | 1336-23 | OP -260.5 | Q | |||
| 0915-21 | Q | 0.847 | 1136-13 | CTS 667 | Q | 0.554 | 1336-26 | Q | 1.51 | ||
| 0922+00 | OK 37 | Q | 1.719 | 1142+05 | 4C 05.52 | Q | 1.342 | 1337-03 | Q | ||
| 0923+39 | 4C 39.25 | Q | 0.698 | 1142-22 | OM -271 | Q | 1.141 | 1345+12 | 4C 12.50 | G | 0.121 |
| 0925-20 | Q | 0.348 | 1143-24 | OM -272 | Q | 1.940 | 1347-21 | OP -279 | RS | ||
| 0931-11 | OK -152 | RS | 1143-28 | OM -273 | Q | 0.45 | 1348-28 | Q | |||
| 0938+11 | Q | 3.191 | 1144+40 | Q | 1.089 | 1349-14 | OP -182 | RS | |||
| 0945+40 | 4C 40.24 | Q | 1.252 | 1145-07 | OM -76 | Q | 1.342 | 1351-01 | Q | 3.707 | |
| 0952+17 | OK 186 | Q | 1.478 | 1148-00 | 4C -00.47 | Q | 1.980 | 1352-10 | OP -187 | Q | 0.332 |
| IAU | Other | OI | Z | IAU | Other | OI | Z | IAU | Other | OI | Z |
| 1354-17 | Q | 3.147 | 1611+34 | DA 406 | Q | 1.401 | 2044-16 | OW -174 | Q | 1.932 | |
| 1354-15 | OP -192 | Q | 1.89 | 1614+05 | OS 23 | Q | 3.217 | 2047+09 | RS | ||
| 1354+19 | 4C 19.44 | Q | 0.719 | 1615+36 | 4C 36.27 | RS | 2047+03 | BL | |||
| 1356+02 | Q | 1.319 | 1615+02 | Q | 1.341 | 2053-04 | 4C -04.80 | Q | 1.176 | ||
| 1402-01 | Q | 2.522 | 1616+06 | OS 28 | Q | 2.088 | 2058-29 | Q | 1.492 | ||
| 1402+04 | Q | 3.211 | 1622-25 | OS -237.8 | Q | 0.786 | 2059+03 | OW 98 | Q | 1.015 | |
| 1403-08 | Q | 1.763 | 1622-29 | Q | 0.815 | 2113+29 | Q | 1.514 | |||
| 1404+28 | OQ 208 | G | 0.077 | 1624+41 | 4C 41.32 | Q | 2.55 | 2121+05 | OX 36 | Q | 1.941 |
| 1406-07 | OQ -10 | Q | 1.493 | 1625-14 | Q | 1.10 | 2126-15 | OX -146 | Q | 3.266 | |
| 1406-26 | Q | 2.43 | 1633+38 | 4C 38.41 | Q | 1.807 | 2126-18 | OX -145 | Q | 0.680 | |
| 1413+34 | OQ 323 | RS | 1635-03a | Q | 2.856 | 2127-09 | Q | >0.780 | |||
| 1416+06 | 3C 298 | Q | 1.439 | 1638+39 | NRAO 512 | Q | 1.666 | 2128+04 | OX 46 | G | 0.990 |
| 1427+10 | OQ 147 | Q | 1.71 | 1641+39 | 3C 345 | Q | 0.594 | 2128-12 | OX -148 | Q | 0.501 |
| 1430-17 | OQ -151 | Q | 2.331 | 1647-29 | RS | 2131-02 | 4C -02.81 | BL | 1.285 | ||
| 1430-15 | OQ -150.2 | Q | 1.573 | 1648+01 | RS | 2134+00 | OX 57 | Q | 1.932 | ||
| 1434+23 | OQ 257 | Q | 1652+39 | Mark 501 | BL | 0.033 | 2135-24 | Q | 0.819 | ||
| 1435-21 | OQ -259 | Q | 1.187 | 1655+07 | OS 92 | Q | 0.621 | 2136+14 | OX 161 | Q | 2.427 |
| 1437-15 | OQ -162 | BL | 1656+05 | OS 94 | Q | 0.879 | 2140-04 | Q | 0.344 | ||
| 1438+38 | OQ 363 | Q | 1.775 | 1656+34 | OS 392 | Q | 1.936 | 2143-15 | OX -173 | Q | 0.698 |
| 1439+32 | OQ 366 | Q | 2.12 | 1657-26 | RS | 2144+09 | OX 74 | Q | 1.113 | ||
| 1441+25 | Q | 0.062 | 1705+01 | Q | 2.576 | 2145+06 | DA 562 | Q | 0.999 | ||
| 1442+10 | OQ 172 | Q | 3.535 | 1706+00 | G | 0.449 | 2147+14 | RS | |||
| 1443-16 | OQ -171 | Q | 1706-17 | OT -111 | RS | 2149+06 | OX 81 | Q | 1.364 | ||
| 1445-16 | OQ -176 | Q | 2.417 | 1717+17 | OT 129 | BL | 2149+05 | OX 82 | Q | 0.740 | |
| 1449-01 | OQ -81 | Q | 1.314 | 1721+34 | 4C 34.47 | Q | 0.206 | 2150+17 | OX 183 | BL | |
| 1452+30 | OQ 287 | Q | 0.580 | 1722+40 | Q | 1.049 | 2155-15 | OX -192 | Q | 0.672 | |
| 1456+04 | 4C 04.49 | G | 0.394 | 1725+12 | OT 143.3 | Q | 2200-23 | Q | 2.118 | ||
| 1502+10 | 4C 10.39 | Q | 1.833 | 1725+04 | Q | 0.293 | 2200+42 | BL Lacertae | BL | 0.069 | |
| 1502+03 | G | 0.413 | 1730-13 | NRAO 530 | Q | 0.902 | 2201+31 | 4C 31.63 | Q | 0.298 | |
| 1504+37 | OR 306 | G | 0.674 | 1732+09 | OT 54 | G | 2201+17 | OY 101 | Q | 1.076 | |
| 1504-16 | OR -102 | Q | 0.876 | 1741-03 | OT -68 | Q | 1.057 | 2201+04 | 4C 04.77 | G | 0.028 |
| 1508-05 | 4C -05.64 | Q | 1.191 | 1743+17 | OT 172 | Q | 1.702 | 2207+35 | OY 313 | RS | |
| 1510-08 | OR -17 | Q | 0.360 | 1749+09 | OT 81 | BL | 0.320 | 2208-13 | Q | 0.391 | |
| 1511-10 | OR -118 | Q | 1.513 | 1751+28 | RS | 2209+08 | DA 574 | Q | 0.484 | ||
| 1511-21 | OR -218 | G | 1.179 | 1756+23 | OT 295 | Q | 1.721 | 2209+23 | Q | ||
| 1514+00 | GNZ 25 | G | 0.052 | 1758+38 | OT 398 | Q | 2.092 | 2214+35 | OY 324 | Q | 0.510 |
| 1514+19 | BL | 1807+27 | 4C 27.41 | Q | 1.760 | 2215+02 | Q | 3.581 | |||
| 1514-24 | AP Librae | BL | 0.048 | 1821+10 | Q | 1.364 | 2216-03 | 4C -03.79 | Q | 0.901 | |
| 1518+04 | 4C 04.51 | G | 1.294 | 1830+28 | CTD 108 | Q | 0.594 | 2223-05 | 3C 446 | Q | 1.404 |
| 1519-27 | BL | 1848+28 | Q | 2.56 | 2223+21 | DA 580 | Q | 1.953 | |||
| 1525+31 | OR 342 | Q | 1.380 | 1901+31 | 3C 395 | Q | 0.635 | 2227-08 | Q | 1.562 | |
| 1532+01 | Q | 1.420 | 1908-20 | OV -213 | Q | 2229-17 | OY -150 | Q | 1.780 | ||
| 1535+00 | Q | 3.497 | 1908-21 | OV -214 | RS | 2230+11 | CTA 102 | Q | 1.037 | ||
| 1538+14 | 4C 14.60 | BL | 0.605 | 1920-21 | OV -235 | RS | 2233-14 | OY -156 | BL | >0.609 | |
| 1543+00 | G | 0.550 | 1921-29 | OV -236 | BL | 0.352 | 2234+28 | CTD 135 | Q | 0.795 | |
| 1546+02 | OR 78 | Q | 0.412 | 1923+21 | OV 239.7 | RS | 2236+12 | OY 160 | Q | ||
| 1548+05 | 4C 05.64 | Q | 1.422 | 1936-15 | OV -161 | Q | 1.657 | 2239+09 | Q | 1.707 | |
| 1548+11 | OR 181 | Q | 0.436 | 1937-10 | Q | 3.787 | 2240-26 | OY -268 | BL | 0.774 | |
| 1550-26 | Q | 2.145 | 1947+07 | OV 80 | Q | 2243-12 | OY -172.6 | Q | 0.630 | ||
| 1551+13 | OR 186 | Q | 1.29 | 1958-17 | OV -198 | Q | 0.652 | 2245-12 | Q | 1.892 | |
| 1555+00 | Q | 1.772 | 2002-18 | OW -185 | Q | 0.868 | 2245+02 | Q | |||
| 1555-14 | G | 0.097 | 2008-15 | OW -115 | Q | 1.180 | 2246+20 | RS | |||
| 1556-24 | Q | 2.818 | 2008-06 | OW -15 | G | 1.047 | 2247+13 | 4C 13.84 | Q | 0.767 | |
| 1600+33 | OS 300 | G | 2012-01 | BL | 2251+15 | 3C 454.3 | Q | 0.859 | |||
| 1604+31 | G | 2029+12 | OW 149 | BL | 1.215 | 2251+24 | DA 587 | Q | 2.327 | ||
| 1606+10 | DA 401 | Q | 1.226 | 2032+10 | OW 154.9 | BL | 0.601 | 2251+13 | 4C 13.85 | Q | 0.677 |
| 1607+26 | OS 111 | G | 0.473 | 2037-25 | Q | 1.574 | 2252-09 | Q | 0.606 |
| IAU | Other | OI | Z |
| 2253+41 | OY 489 | Q | 1.476 |
| 2254+02 | OY 91.3 | Q | 2.089 |
| 2254+07 | OY 091 | BL | 0.190 |
| 2255+41 | 4C 41.45 | Q | 2.15 |
| 2255-28 | Q | 0.926 | |
| 2256+01 | Q | 2.663 | |
| 2300-18 | OZ -102 | G | 0.129 |
| 2303-05 | 4C -05.95 | Q | 1.139 |
| 2307+10 | 4C 10.70 | RS | |
| 2318+04 | OZ 031 | Q | 0.623 |
| 2318-19 | OZ -130 | G | |
| 2319+31 | G | ||
| 2319+27 | CTD 139 | Q | 1.253 |
| 2320+07 | DA 599 | Q | 2.090 |
| 2320-02 | Q | ||
| 2320-03 | Q | 1.411 | |
| 2325-15 | Q | 2.465 | |
| 2327+33 | Q | 1.809 | |
| 2328+10 | 4C 10.73 | Q | 1.489 |
| 2328+31 | OZ 347 | RS | |
| 2329-16 | OZ -149 | Q | 1.153 |
| 2330+08 | OZ 50.8 | RS | |
| 2331-24 | OZ -252 | G | 0.048 |
| 2332-01 | Q | 1.184 | |
| 2335-18 | OZ -160 | Q | 1.450 |
| 2335-02 | Q | 1.072 | |
| 2337+26 | Q | ||
| 2338+33 | RS | ||
| 2344+09 | 4C 09.74 | Q | 0.673 |
| 2344+092 | RS | ||
| 2345-16 | OZ -176 | Q | 0.576 |
| 2349-01 | 4C -01.61 | Q | 0.174 |
| 2351-00 | Q | 0.463 | |
| 2351-15 | OZ -187 | Q | 2.675 |
| 2354-11 | Q | 0.960 | |
| 2355-10 | Q | 1.622 | |
| 2356+19 | OZ 193 | Q | 1.066 |
| 2356+38 | OZ 395 | Q | 2.704 |
Some earlier RATAN-600 results on broad band spectra observations were presented for samples from 8.7 GHz Zelenchuk sky survey by Amirkhanyan et al. (1992) and 87GB survey by Mingaliev & Khabrakhmanov (1995), for strong compact extragalactic objects by Kovalev et al. (1996) and weak radio sources from the RATAN-600 "Cold" deep sky survey by Bursov (1997).
A broad band spectrum of a compact extragalactic radio source is usually considered to be the sum of spectra of several compact and extended components in a source structure. The components are located at various distances from the central nucleus of the object, and are likely to have resulted from activity within the nucleus. The nucleus may be a black hole, which converts an accreted ambient gas to ejected relativistic particles along magnetic fields. Some of the components can be variable in time. The variability can misrepresent the true shape of a spectrum if measurements at all or especially high frequencies are not simultaneous.
In this work we present observational results of more than five hundred sources at six frequencies from 1 to 22 GHz using a single radio telescope. Flux densities at all frequencies are measured practically instantaneously - over a period of a few minutes. This is the shortest time scale of broad band six frequency measurements for the largest sample of sources so far, which has been used for a spectra survey of compact extragalactic radio sources.
These observations are part of a long-term program of instantaneous spectra monitoring of compact extragalactic objects (Kovalev 1998), which have milliarcsecond components and are studied by VLBI networks. They also give a ground spectra support for the VSOP survey and a pre-launch spectra study of the objects for the RadioAstron project. The goal of the long-term program is a mass study of the spectra and their variability for many hundreds of compact extragalactic radio sources. It is also among our intentions to find a relationship between instantaneous multifrequency spectra and the VLBI radio structure.
Copyright The European Southern Observatory (ESO)