2005A&A...432...31T

Query : 2005A&A...432...31T

2005A&A...432...31T - Astronomy and Astrophysics, volume 432, 31-43 (2005/3-2)

High Frequency Peakers: Young radio sources or flaring blazars?

TINTI S., DALLACASA D., DE ZOTTI G., CELOTTI A. and STANGHELLINI C.

Abstract (from CDS):

We present new, simultaneous, multifrequency observations of 45 out of the 55 candidate High Frequency Peakers (HFP) selected by Dallacasa et al. (2000A&A...363..887D), carried out 3 to 4 years after a first set of observations. Our sub-sample consists of 10 galaxies, 28 stellar objects (``quasars'') and 7 unidentified sources. Both sets of observations are sensitive enough to allow the detection of variability at the 10% level or lower. While galaxies do not show significant variability, most quasars do. Seven of them no longer show the convex spectrum which is the defining property of Gigahertz Peaked Spectrum (GPS)/HFP sources and are interpreted as blazars caught by Dallacasa et al. (2000A&A...363..887D) during a flare, when a highly self-absorbed component dominated the emission. In general, the variability properties (amplitude, timescales, correlation between peak luminosity and peak frequency of the flaring component) of the quasar sub-sample resemble those of blazars. We thus conclude that most HFP candidates identified with quasars may well be flaring blazars.

Abstract Copyright: ∼

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

Simbad objects: 47

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Number of rows : 47
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 J000319.3+212944 Sy2 00 03 19.35000596 +21 29 44.5083164   21.005 20.580 19.650   ~ 44 1
2 QSO B0002+0507 BLL 00 05 20.2155845040 +05 24 10.802758572   16.56 16.21 16.26   ~ 183 1
3 ICRF J003732.1+080813 Bz? 00 37 32.19718344 +08 08 13.0569095       22.31   ~ 24 1
4 QSO B0108+388 Bla 01 11 37.31680 +39 06 28.1039     22 22.000   ~ 254 1
5 IVS B0113+24A Rad 01 16 33.4575385536 +24 22 15.609264780           ~ 6 0
6 QSO J0217+0144 QSO 02 17 48.95475095 +01 44 49.6990271   16.74 16.09 18.51 13.29 ~ 425 1
7 ICRF J032915.3+351005 BLL 03 29 15.3548503584 +35 10 05.989666620       17.60   ~ 45 1
8 QSO J0357+2319 QSO 03 57 21.60989042 +23 19 53.8251826       18.78   ~ 44 1
9 ICRF J042805.8+325952 QSO 04 28 05.80875891 +32 59 52.0442031       21.39   ~ 45 0
10 PMN J0519+0848 Rad 05 19 10.81113186 +08 48 56.7346356           ~ 23 1
11 ICRF J062518.2+444001 BLL 06 25 18.26537500 +44 40 01.6261460     16.80 18.71   ~ 99 1
12 6C 063338+593631 Bz? 06 38 02.87192548 +59 33 22.2138567           ~ 37 1
13 QSO B0636+68 BLL 06 42 04.2572705040 +67 58 35.620484340     16.46 16.01   ~ 226 1
14 7C 064253.00+445430.00 QSO 06 46 32.02599653 +44 51 16.5901185   19.57 18.49 18.64   ~ 348 1
15 QSO B0646+600 QSO 06 50 31.25435548 +60 01 44.5549353   18.9 18.6 19.65   ~ 117 1
16 3C 286 Sy1 13 31 08.2883506368 +30 30 32.960091564   17.51 17.25     ~ 4341 2
17 QSO B1333+459 QSO 13 35 21.9623576640 +45 42 38.232772128   18.30 18.22 17.67   ~ 101 0
18 4C 58.26 Bz? 13 35 25.92853561 +58 44 00.2912887       21.91   ~ 54 1
19 Mrk 668 Sy1 14 07 00.39441712 +28 27 14.6901341   16.13 15.35 10.29   ~ 773 2
20 BWE 1410+1349 Bz? 14 12 36.37265047 +13 34 38.1527962           ~ 27 0
21 QSO B1422+2309 BLL 14 24 38.0938 +22 56 00.587   16.77 15.84 14.79   ~ 450 1
22 [PBW92] 1422+231 gLS 14 24 38.09400 +22 56 00.5900   16.77 15.84 14.79   ~ 356 0
23 QSO J1430+1043 QSO 14 30 09.73880343 +10 43 26.8623079     18.5 18.67   ~ 91 1
24 ICRF J145738.1+074954 Sy1 14 57 38.12869548 +07 49 54.7150624   21.26 20.74 19.37   ~ 42 1
25 ICRF J150506.4+032630 Sy1 15 05 06.47716039 +03 26 30.8125704   19.02 18.62 17.72   ~ 253 1
26 ICRF J151141.2+051809 Sy2 15 11 41.26637844 +05 18 09.2590927   18.49 17.80 13.95   ~ 108 0
27 QSO J1526+6650 QSO 15 26 42.8744737248 +66 50 54.644414316   18.26 17.87 17.24   ~ 55 0
28 ICRF J160341.9+110548 BLL 16 03 41.93125418 +11 05 48.6791330   18.41 17.82 16.66   ~ 65 1
29 QSO B1614+051 QSO 16 16 37.55681923 +04 59 32.7365717   19.60 19.17 19.49   ~ 186 2
30 [VV96] J162304.5+662401 QSO 16 23 04.52169655 +66 24 01.0787041   19.477   17.430   ~ 63 1
31 7C 1645+6335 QSO 16 45 58.55268458 +63 30 10.9228284   19.87 19.77 19.5   ~ 69 1
32 MITG J1735+5049 Rad 17 35 45.8 +50 49 00           ~ 2 0
33 7C 175844.60+384828.00 QSO 18 00 24.76536016 +38 48 30.6974570   17.8 17.98 17.04   ~ 151 1
34 ICRF J181143.1+170457 BLL 18 11 43.18346508 +17 04 57.2575194       18.98   ~ 31 0
35 QSO J1840+3900 QSO 18 40 57.15422373 +39 00 45.7240946     19.20 19.14   ~ 53 1
36 QSO B1848+283 QSO 18 50 27.5898721080 +28 25 13.155071160   17.1 17 17.16   ~ 82 1
37 ICRF J185527.7+374256 QSO 18 55 27.70681096 +37 42 56.9655757       20.20   ~ 36 1
38 ICRF J202135.2+051504 QSO 20 21 35.28120633 +05 15 04.7781809       21.70   ~ 38 0
39 [VV96] J202456.5+171814 QSO 20 24 56.5636552128 +17 18 13.196337192   17.5 19.5 17.51   ~ 50 1
40 QSO B2059+034 QSO 21 01 38.83415344 +03 41 31.3207714   18.13 17.78 17.68   ~ 165 1
41 QSO J2123+0535 QSO 21 23 44.51739933 +05 35 22.0930238   18.3 20.40 19.86   ~ 294 1
42 ICRF J220330.9+100742 Bz? 22 03 30.95260247 +10 07 42.5863773       21.38   ~ 40 0
43 ICRF J220752.8+165217 QSO 22 07 52.86567746 +16 52 17.8154293   19.5 19.5 19.98   ~ 43 1
44 QSO B2209+236 QSO 22 12 05.96631459 +23 55 40.5438259   19 20.66 19.69   ~ 230 1
45 QSO J2257+0243 Bla 22 57 17.56309534 +02 43 17.5116538   18.04 17.96 18.45   ~ 156 1
46 QSO J2320+0513 QSO 23 20 44.85659166 +05 13 49.9526016   18.6 19.0     ~ 155 1
47 QSO B2327+335 QSO 23 30 13.73765966 +33 48 36.4714906     18.5 18.71   ~ 49 1

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