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


C.D.S. - SIMBAD4 rel 1.7 - 2021.05.18CEST03:55:17

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 - 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 QSO B0002+0507 BLL 00 05 20.2154926286 +05 24 10.802553926   16.56 16.21 16.26   ~ 175 1
3 ICRF J003732.1+080813 Bz? 00 37 32.1971799 +08 08 13.057057       22.31   ~ 23 1
4 QSO B0108+388 Bla 01 11 37.31680 +39 06 28.1039     22 22.000   ~ 243 1
5 NAME IVS B0113+24A Rad 01 16 33.4540004505 +24 22 15.641101005           ~ 6 0
6 QSO J0217+0144 QSO 02 17 48.9547510 +01 44 49.698899   16.74 16.09 18.51 13.29 ~ 383 1
7 ICRF J032915.3+351005 BLL 03 29 15.3548963 +35 10 05.991282       17.60   ~ 38 1
8 QSO J0357+2319 QSO 03 57 21.60988566 +23 19 53.8255336       18.78   ~ 36 1
9 ICRF J042805.8+325952 QSO 04 28 05.8087390 +32 59 52.043968       21.39   ~ 40 0
10 PMN J0519+0848 Rad 05 19 10.8111308 +08 48 56.734522           ~ 20 1
11 ICRF J062518.2+444001 BLL 06 25 18.2651888885 +44 40 01.625648996     16.80 18.71   ~ 79 1
12 6C 063338+593631 Bz? 06 38 02.8719115 +59 33 22.213886           ~ 33 1
13 QSO B0636+68 BLL 06 42 04.2571549109 +67 58 35.621670644     16.46 16.01   ~ 211 1
14 7C 064253.00+445430.00 QSO 06 46 32.02599463 +44 51 16.5901237   19.57 18.49 18.64   ~ 327 1
15 QSO B0646+600 QSO 06 50 31.2543062 +60 01 44.554767   18.9 18.6 19.65   ~ 108 1
16 3C 286 Sy1 13 31 08.2885060664 +30 30 32.960825107   17.51 17.25     ~ 3866 2
17 QSO B1333+459 QSO 13 35 21.9625685328 +45 42 38.233185530   18.30 18.22 17.67   ~ 92 0
18 4C 58.26 Bz? 13 35 25.9285191 +58 44 00.291595       21.91   ~ 48 1
19 QSO B1404+286 BLL 14 07 00.3933203928 +28 27 14.695133019   16.13 15.35 10.29   ~ 699 2
20 ICRF J141236.3+133438 Bz? 14 12 36.3726447 +13 34 38.152733           ~ 25 0
21 QSO B1422+2309 BLL 14 24 38.09400 +22 56 00.5900   16.77 15.84 14.79   ~ 424 1
22 [PBW92] 1422+231 gLS 14 24 38.09400 +22 56 00.5900   16.77 15.84 14.79   ~ 355 0
23 QSO J1430+1043 QSO 14 30 09.7387961 +10 43 26.862336     18.5 18.67   ~ 80 1
24 ICRF J145738.1+074954 QSO 14 57 38.1287106 +07 49 54.715196   21.26 20.74 19.37   ~ 34 1
25 ICRF J150506.4+032630 Sy1 15 05 06.47715917 +03 26 30.8126616   19.02 18.62 17.72   ~ 208 1
26 ICRF J151141.2+051809 Sy1 15 11 41.2664270 +05 18 09.259581   18.49 17.80 13.95   ~ 94 0
27 QSO J1526+6650 QSO 15 26 42.8755263333 +66 50 54.641671782   18.26 17.87 17.24   ~ 50 0
28 ICRF J160341.9+110548 BLL 16 03 41.9312784330 +11 05 48.681252147   18.41 17.82 16.66   ~ 41 1
29 QSO B1614+051 QSO 16 16 37.55681502 +04 59 32.7367495   19.60 19.17 19.49   ~ 177 2
30 [VV96] J162304.5+662401 QSO 16 23 04.5217665 +66 24 01.078732   19.477   17.430   ~ 58 1
31 7C 1645+6335 QSO 16 45 58.5526978 +63 30 10.922982   19.87 19.77 19.5   ~ 53 1
32 MITG J1735+5049 Rad 17 35 45.8 +50 49 00           ~ 2 0
33 7C 175844.60+384828.00 QSO 18 00 24.76536125 +38 48 30.6975330   17.8 17.8 17.04   ~ 136 1
34 ICRF J181143.1+170457 BLL 18 11 43.1834676 +17 04 57.257465       18.98   ~ 28 0
35 QSO J1840+3900 QSO 18 40 57.15423614 +39 00 45.7241751     19.20 19.14   ~ 47 1
36 QSO B1848+283 QSO 18 50 27.5896910962 +28 25 13.154274911   17.1 17 17.16   ~ 76 1
37 ICRF J185527.7+374256 QSO 18 55 27.7068244 +37 42 56.965928       20.20   ~ 33 1
38 ICRF J202135.2+051504 QSO 20 21 35.2812075 +05 15 04.778183       21.70   ~ 36 0
39 [VV96] J202456.5+171814 QSO 20 24 56.5633680729 +17 18 13.191922409   17.5 19.5 17.51   ~ 45 1
40 QSO B2059+034 QSO 21 01 38.83416420 +03 41 31.3209577   18.13 17.78 17.68   ~ 153 1
41 QSO J2123+0535 QSO 21 23 44.51738 +05 35 22.0933   18.3 17.5 19.86   ~ 267 1
42 ICRF J220330.9+100742 Bz? 22 03 30.9525909 +10 07 42.586730       21.38   ~ 35 0
43 ICRF J220752.8+165217 QSO 22 07 52.86568240 +16 52 17.8155788   19.5 19.5 19.98   ~ 39 1
44 QSO B2209+236 QSO 22 12 05.96631138 +23 55 40.5438272   19   19.69   ~ 197 1
45 QSO J2257+0243 QSO 22 57 17.56309815 +02 43 17.5117291   18.04 17.96 18.45   ~ 147 1
46 QSO J2320+0513 QSO 23 20 44.8565850 +05 13 49.952461   18.6 19.0     ~ 141 1
47 QSO B2327+335 QSO 23 30 13.7376483 +33 48 36.471790     18.5 18.71   ~ 42 1

    Equat.    Gal    SGal    Ecl

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2021.05.18-03:55:17

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