2007A&A...469..451T


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.03CET11:30:27

2007A&A...469..451T - Astronomy and Astrophysics, volume 469, 451-457 (2007/7-2)

Radio continuum spectra of gigahertz-peaked spectrum galaxies.

TORNIAINEN I., TORNIKOSKI M., LAEHTEENMAEKI A., ALLER M.F., ALLER H.D. and MINGALIEV M.G.

Abstract (from CDS):

Recent studies have shown that a remarkable share of quasars classified in the literature as gigahertz-peaked spectrum (GPS) sources and high frequency peakers (HFPs) are actually flaring flat-spectrum sources or blazars. Thus, at least among the quasar-type samples, genuine GPS sources and HFPs seem to be rare. We have studied variability and the shape of the radio continuum spectra of a sample of 96 galaxy-type GPS sources and HFPs in order to find out whether there is a similar contamination in the galaxy-type samples. We collected radio data for the sample from the literature, our long-term monitoring campaigns, and recent observations, and then plotted the radio continuum spectra. We also calculated the peak frequencies, the spectral indices, and the variability indices, and finally classified the sources according to these parameters. About 30% of the galaxies in our sample are clearly GPS sources, for another ∼30% there are not enough data for a solid classification, and the rest are flat- or steep-spectrum sources. The galaxy-type GPS samples seem to be cleaner than the quasar-type, but there is also a remarkable contamination of other source types among the galaxies. However, there may be a strong selection effect, originating from the different selection criteria of the original samples, which must be taken into consideration when comparing the results of this and our previous study. Both simultaneous spectra and long-term monitoring are essential when classifying convex-spectrum sources. However, even monitoring for several years may not reveal the variable nature of a source with a convex radio spectrum.

Abstract Copyright:

Journal keyword(s): quasars: general - radio continuum: galaxies

VizieR on-line data: <Available at CDS (J/A+A/469/451): table2.dat>

Simbad objects: 97

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Number of rows : 97

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 ICRF J000319.3+212944 Sy2 00 03 19.3500132 +21 29 44.508188   21.005 20.580 19.650   ~ 41 1
2 ICRF J002127.3+731241 G 00 21 27.37482251 +73 12 41.9312197           ~ 33 1
3 2XMMi J002209.9+001629 Sy1 00 22 09.9563601674 +00 16 29.317197869   17.6 18.23 18.2   ~ 42 0
4 ICRF J002442.9-420203 G 00 24 42.98993 -42 02 03.9507   22       ~ 61 0
5 ICRF J002914.2+345632 AGN 00 29 14.24246572 +34 56 32.2471186   20.2       ~ 122 1
6 PKS 0105-12 AGN 01 08 13.2 -12 00 50     19.0     ~ 10 0
7 QSO B0108+388 Bla 01 11 37.31680 +39 06 28.1039     22 22.000   ~ 242 1
8 4C 31.04 rG 01 19 35.0033970 +32 10 50.058043   16 14.5     ~ 219 1
9 PKS 0204-306 Rad 02 06 43.20 -30 24 58.2           ~ 7 1
10 NVSS J021010-221336 AGN 02 10 10.0 -22 13 36     15.5     ~ 15 0
11 87GB 020808.1+040519 G 02 10 44.52 +04 19 35.4           ~ 14 1
12 NGC 1052 GiP 02 41 04.79851 -08 15 20.7517 11.84 11.41 10.47 10.71   ~ 1171 2
13 QSO B0240-217 QSO 02 42 35.9098821 -21 32 25.935234   17       ~ 50 1
14 ICRF J031857.8+162832 AGN 03 18 57.8028254 +16 28 32.689683     22.0     ~ 191 1
15 4C 05.14 rG 03 23 20.2606504221 +05 34 11.893889982     19     ~ 73 1
16 ICRF J040121.4-292126 AGN 04 01 21.4837249 -29 21 26.830417           ~ 21 1
17 SUMSS J040734-392445 AGN 04 07 34.4 -39 24 47           ~ 11 1
18 [VV2010c] J040757.9-275705 AGN 04 07 57.9 -27 57 05           ~ 12 1
19 ICRF J041045.6+765645 AGN 04 10 45.6108324 +76 56 45.313088   21 22.0 21.200   ~ 149 1
20 ICRF J042805.8+325952 QSO 04 28 05.8087390 +32 59 52.043968       21.39   ~ 40 0
21 PKS 0428+205 rG 04 31 03.7614907 +20 37 34.264207   22.174   19.085   ~ 173 1
22 4C -02.17 QSO 04 33 54.9 -02 29 56     19.5     ~ 27 1
23 ICRF J044133.7-334003 G 04 41 33.7680854 -33 40 03.915024           ~ 17 1
24 ICRF J045720.2-084905 AGN 04 57 20.2128949 -08 49 05.483323           ~ 18 1
25 ICRF J050321.1+020304 Sy2 05 03 21.1971480 +02 03 04.676648   22.500 21.350 20.682   ~ 179 1
26 [VV2006] J055652.6-024105 Sy2 05 56 52.6231150 -02 41 05.515611   20.968   19.533   ~ 31 1
27 ICRF J061024.2+780136 G 06 10 24.2793191 +78 01 36.194876           ~ 21 1
28 ICRF J065510.0+410010 QSO 06 55 10.02473 +41 00 10.1598   14.6   9.37   ~ 61 1
29 UGC 3593 G 06 55 14.220 +40 57 38.74   14.7       ~ 25 0
30 B3 0700+470 Rad 07 04 09.5582895 +47 00 56.040060           ~ 22 0
31 7C 0703+4652 G 07 06 48.1 +46 47 56   23.1       ~ 34 1
32 QSO B0710+439 QSO 07 13 38.16412910 +43 49 17.2071530   20.7       ~ 233 0
33 QSO B0742+103 QSO 07 45 33.05952141 +10 11 12.6923363       23.72   ~ 180 1
34 87GB 090404.3+035425 AGN 09 06 41.0 +03 42 42           ~ 21 1
35 87GB 091049.4+150652 G 09 13 35.0 +14 54 20           ~ 12 1
36 87GB 091433.4+112607 G 09 17 16.4 +11 13 37           ~ 23 1
37 ICRF J094336.9-081930 LIN 09 43 36.9444590 -08 19 30.818298   19.401   18.100   ~ 112 2
38 ICRF J103507.0+562846 Sy2 10 35 07.0400250 +56 28 46.795465   20.2 21.244 20.200   ~ 179 1
39 OHIO L -270 G 10 44 37.7 -27 12 17           ~ 8 0
40 ICRF J105715.7+001203 G 10 57 15.7674222 +00 12 03.575400           ~ 24 1
41 87GB 110710.4+110001 G 11 09 46.1 +10 43 44           ~ 22 1
42 QSO B1107-187 QSO 11 10 00.4069026 -18 58 48.743327   22.44 21.10     ~ 35 0
43 ICRF J112027.8+142054 G 11 20 27.80726 +14 20 54.9914   20 20.935 20.100   ~ 148 1
44 ICRF J112256.4-274248 G 11 22 56.4100493 -27 42 48.465389           ~ 21 0
45 4C -00.45 AGN 11 35 13.0 -00 21 19           ~ 24 1
46 [VV2006] J120321.9+041419 QSO 12 03 21.9376688919 +04 14 19.083066016   19.22 18.89     ~ 56 1
47 4C 32.44 QSO 13 26 16.51232948 +31 54 09.5144454   21.367 19.822 18.882   ~ 159 1
48 NVSS J132650+571207 Rad 13 26 50.5723155 +57 12 06.745904           ~ 17 1
49 ICRF J134551.5-301504 AGN 13 45 51.5200015 -30 15 04.593148           ~ 16 1
50 ICRF J134733.3+121724 Sy2 13 47 33.36161542 +12 17 24.2402572   19.28 18.44 15.718   ~ 538 3
51 ICRF J135014.0-220441 AGN 13 50 14.0901597 -22 04 41.077600           ~ 30 1
52 DW 1349+02 AGN 13 52 30.7 +02 32 47     19     ~ 25 1
53 4C 11.46 AGN 13 52 56.4 +11 07 08   20.0       ~ 19 1
54 QSO B1354-174 QSO 13 57 06.07420483 -17 44 01.9049126   19 19 18   ~ 82 1
55 NVSS J135740+435400 rG 13 57 40.5921897 +43 53 59.769211     22.708 20.951   ~ 41 1
56 ICRF J140028.6+621038 Sy2 14 00 28.6484960 +62 10 38.588791   22.137 20.373 19.530   ~ 164 1
57 QSO B1404+286 BLL 14 07 00.3933203928 +28 27 14.695133019   16.13 15.35 10.29   ~ 693 2
58 ICRF J143539.9-041455 QSO 14 35 39.9095684344 -04 14 55.270627708   18.14   17.38   ~ 27 1
59 [VV2010c] J144719.7-340916 AGN 14 47 19.7 -34 09 16           ~ 10 1
60 ICRF J150603.0-091912 QSO 15 06 03.0341317 -09 19 12.056151           ~ 21 1
61 ICRF J151141.2+051809 Sy1 15 11 41.2664270 +05 18 09.259581   18.49 17.80 13.95   ~ 91 0
62 PKS 1540-077 rG 15 43 01.68756006 -07 57 06.6299321   18       ~ 33 1
63 ICRF J154609.5+002624 Bla 15 46 09.5314561 +00 26 24.614551   19.730 18.900 19.5   ~ 77 1
64 ICRF J154812.9-121331 G 15 48 12.9397200 -12 13 31.320435           ~ 17 1
65 4C -06.43 AGN 15 56 14.0 -06 22 38           ~ 15 1
66 PKS 1557-00 Rad 16 00 01.0136 -00 37 22.590           ~ 17 0
67 7C 160012.00+333509.00 Bla 16 02 07.26346106 +33 26 53.0724368     23.0 23   ~ 116 1
68 ICRF J160401.4-222340 G 16 04 01.4717369 -22 23 40.988449   21.0       ~ 36 1
69 QSO J1606+3124 QSO 16 06 08.5183910 +31 24 46.457906       22.56   ~ 35 0
70 ICRF J160913.3+264129 Sy2 16 09 13.32076181 +26 41 29.0362080   19       ~ 210 0
71 [VV96] J162304.5+662401 QSO 16 23 04.5217665 +66 24 01.078732   19.477   17.430   ~ 58 1
72 4C 12.60 rG 16 40 47.9388277 +12 20 02.078893   19.5       ~ 47 1
73 4C 02.43 AGN 16 48 31.8 +02 42 46   17       ~ 20 1
74 ICRF J173458.3+092658 Bla 17 34 58.3768027 +09 26 58.265118       20.8   ~ 56 1
75 ICRF J173549.0+504911 Bz? 17 35 49.00517 +50 49 11.5659       22.40   ~ 45 1
76 87GB 175104.0+275120 G 17 53 01.34610 +27 50 59.0160           ~ 20 1
77 QSO B1843+357 QSO 18 45 24.0867081620 +35 48 13.564084074     18.0     ~ 9 1
78 NVSS J184535+354116 rG 18 45 35.1088474 +35 41 16.726462   19.830   21.900   ~ 60 0
79 ICRF J185527.7+374256 QSO 18 55 27.7068244 +37 42 56.965928       20.20   ~ 33 1
80 ICRF J193925.0-634245 Sy2 19 39 25.02671 -63 42 45.6255   18.87 18.37 17.64   ~ 993 1
81 PKS 2008-068 rG 20 11 14.21582849 -06 44 03.5554174     17.2     ~ 80 1
82 ICRF J202135.2+051504 QSO 20 21 35.2812075 +05 15 04.778183       21.70   ~ 36 0
83 ICRF J202206.6+613658 Sy2 20 22 06.68174818 +61 36 58.8047862     19.5 17.58   ~ 304 1
84 ICRF J205252.0+363535 Sy2 20 52 52.0549923 +36 35 35.300002   22.083   21.200   ~ 93 1
85 PKS 2053-20 rG 20 56 04.314 -19 56 35.41   19.0       ~ 53 1
86 4C 05.78 G 20 58 26 +05 40.7           ~ 13 0
87 PMN J2123-0112 G 21 23 39.1 -01 12 35           ~ 33 1
88 ICRF J213032.8+050217 G 21 30 32.87739291 +05 02 17.4741657     23.4     ~ 148 1
89 ICRF J215137.8+055212 Sy1 21 51 37.87549312 +05 52 12.9545524   23.700 22.050 20.850   ~ 107 1
90 ICRF J220330.9+100742 Bz? 22 03 30.9525909 +10 07 42.586730       21.38   ~ 35 0
91 4C 01.69 AGN 22 12 37.9731734 +01 52 51.189651     21.7     ~ 78 1
92 Gopal 2323+790 G 23 25 03.0 +79 17 15           ~ 11 1
93 [VV2010c] J232510.2-034446 AGN 23 25 10.2 -03 44 46           ~ 27 0
94 QSO B2333-528 Bz? 23 36 12.14451 -52 36 21.9504   18.8       ~ 69 1
95 2MASX J23393142+2616088 GiC 23 39 31.428 +26 16 08.80           ~ 3 0
96 4C -06.76 AGN 23 39 46.40 -06 04 12.4           ~ 16 2
97 ICRF J235509.4+495008 BLL 23 55 09.45814510 +49 50 08.3395036   21.101   18.400   ~ 254 1

    Equat.    Gal    SGal    Ecl

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2021.03.03-11:30:28

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