2006A&A...450..959O

Query : 2006A&A...450..959O

2006A&A...450..959O - Astronomy and Astrophysics, volume 450959-970 (2006/5-2)

VLBA images of high frequency peakers.

ORIENTI M., DALLACASA D., TINTI S. and STANGHELLINI C.

Abstract (from CDS):

We propose a morphological classification based on the parsec scale structure of fifty-one High Frequency Peakers (HFPs) from the ``bright'' HFP sample. VLBA images at two adjacent frequencies (chosen among 8.4, 15.3, 22.2 and 43.2GHz) have been used to investigate the morphological properties of the HFPs in the optically thin part of their spectrum. We confirm that there is quite a clear distinction between the pc-scale radio structure of galaxies and quasars: the 78% of the galaxies show a ``Double/Triple'' morphology, typical of Compact Symmetric Objects (CSOs), while the 87% of the quasars are characterised by Core-Jet or unresolved structure. This suggests that most HFP candidates identified with quasars are likely blazar objects in which a flaring self-absorbed component at the jet base was outshining the remainder of the source at the time of the selection based on the spectral shape. Among the sources classified as CSOs or candidates it is possible to find extremely young radio sources with ages of about 100 years or even less.

Abstract Copyright: ∼

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

VizieR on-line data: <Available at CDS (J/A+A/450/959): table2.dat table3.dat table4.dat>

Simbad objects: 58

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Number of rows : 58
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 QSO J0003+2129 Bla 00 03 19.35000596 +21 29 44.5083164   21.005 20.580 19.650   ~ 49 1
2 QSO B0002+0507 BLL 00 05 20.2155845040 +05 24 10.802758572   16.56 16.21 16.26   ~ 188 1
3 ICRF J003732.1+080813 Bz? 00 37 32.19718344 +08 08 13.0569095       22.31   ~ 26 1
4 QSO B0108+388 Bla 01 11 37.31680 +39 06 28.1039     22 22.000   ~ 266 1
5 ICRF J011638.0+242253 Bz? 01 16 38.06766282 +24 22 53.7245654       21.90   ~ 20 0
6 QSO J0217+0144 Bla 02 17 48.95475095 +01 44 49.6990271   16.74 16.09 18.51 13.29 ~ 455 1
7 ICRF J032915.3+351005 BLL 03 29 15.3548503584 +35 10 05.989666620       17.60   ~ 51 1
8 QSO J0357+2319 QSO 03 57 21.60989042 +23 19 53.8251826       18.78   ~ 50 1
9 ICRF J042805.8+325952 Bla 04 28 05.80875891 +32 59 52.0442031       21.39   ~ 50 1
10 PMN J0519+0848 Rad 05 19 10.81113186 +08 48 56.7346356           ~ 27 1
11 ICRF J062518.2+444001 BLL 06 25 18.26537500 +44 40 01.6261460     16.80 18.71   ~ 112 1
12 6C 063338+593631 Bz? 06 38 02.87192548 +59 33 22.2138567           ~ 41 1
13 QSO B0636+68 BLL 06 42 04.2572705040 +67 58 35.620484340     16.46 16.01   ~ 234 1
14 7C 064253.00+445430.00 Bla 06 46 32.02599653 +44 51 16.5901185   19.57 18.49 18.64   ~ 370 1
15 QSO B0646+600 Bla 06 50 31.25435548 +60 01 44.5549353   18.9 18.6 19.65   ~ 125 1
16 Z 204-27 QSO 06 55 10.02472583 +41 00 10.1602339   14.6   9.37   ~ 71 1
17 [VV98] J072201.2+372229 Bla 07 22 01.2594530208 +37 22 28.634815884     17.91 17.27   ~ 40 1
18 4C 39.25 Bla 09 27 03.01394144 +39 02 20.8518067   17.17 17.00 16.486   ~ 1036 1
19 QSO J1016+0513 Bla 10 16 03.13647602 +05 13 02.3413146   20.26 19.83 20   ~ 162 1
20 QSO B1043+066A Bla 10 45 52.7330168808 +06 24 36.451178352   18.24 17.92 17.53   ~ 69 1
21 6C 114618+531124 Bla 11 48 56.5690073664 +52 54 25.323857892   17.19 16.87 16.45   ~ 89 1
22 QSO B1333+459 Bla 13 35 21.9623576640 +45 42 38.232772128   18.30 18.22 17.67   ~ 107 1
23 4C 58.26 Bz? 13 35 25.92853561 +58 44 00.2912887       21.91   ~ 60 1
24 Mrk 668 BLL 14 07 00.39441712 +28 27 14.6901341   16.13 15.35 10.29   ~ 826 3
25 BWE 1410+1349 Bz? 14 12 36.37265047 +13 34 38.1527962           ~ 30 1
26 QSO B1422+2309 BLL 14 24 38.0938 +22 56 00.587   16.77 15.84 14.79   ~ 464 1
27 [PBW92] 1422+231 gLS 14 24 38.09400 +22 56 00.5900   16.77 15.84 14.79   ~ 359 0
28 QSO J1430+1043 Bla 14 30 09.73880343 +10 43 26.8623079     18.5 18.67   ~ 96 1
29 ICRF J145738.1+074954 Bla 14 57 38.12869548 +07 49 54.7150624   21.26 20.74 19.37   ~ 47 1
30 QSO J1505+0326 Bla 15 05 06.47716039 +03 26 30.8125704   19.02 18.62 17.72   ~ 278 1
31 QSO B1509+054 Bla 15 11 41.26637844 +05 18 09.2590927   18.49 17.80 13.95   ~ 122 0
32 QSO J1526+6650 Bla 15 26 42.8744737248 +66 50 54.644414316   18.26 17.87 17.24   ~ 59 1
33 ICRF J160341.9+110548 BLL 16 03 41.93125418 +11 05 48.6791330   18.41 17.82 16.66   ~ 77 2
34 QSO B1614+051 Bla 16 16 37.55681923 +04 59 32.7365717   19.60 19.17 19.49   ~ 195 2
35 [VV96] J162304.5+662401 Bla 16 23 04.52169655 +66 24 01.0787041   19.477   17.430   ~ 67 1
36 3C 345 Bla 16 42 58.80997043 +39 48 36.9939552   16.81 16.59 16.84   ~ 1808 3
37 7C 1645+6335 Bla 16 45 58.55268458 +63 30 10.9228284   19.87 19.77 19.5   ~ 80 1
38 ICRF J171701.1+191740 QSO 17 17 01.16594708 +19 17 40.6558800           ~ 22 1
39 NVSS J173549+504911 rG 17 35 49.00517 +50 49 11.5659       22.40   ~ 57 1
40 4C 09.57 BLL 17 51 32.81857326 +09 39 00.7284066   17.46 16.78 15.57   ~ 1007 1
41 7C 175844.60+384828.00 Bla 18 00 24.76536016 +38 48 30.6974570   17.8 17.98 17.04   ~ 161 1
42 ICRF J181143.1+170457 BLL 18 11 43.18346508 +17 04 57.2575194       18.98   ~ 36 1
43 QSO J1840+3900 Bla 18 40 57.15422373 +39 00 45.7240946     19.20 19.14   ~ 58 1
44 QSO B1848+283 Bla 18 50 27.5898721080 +28 25 13.155071160   17.1 17 17.16   ~ 87 1
45 ICRF J185527.7+374256 Bla 18 55 27.70681096 +37 42 56.9655757       20.20   ~ 41 1
46 ICRF J202135.2+051504 QSO 20 21 35.28120633 +05 15 04.7781809       21.70   ~ 40 1
47 [VV96] J202456.5+171814 Bla 20 24 56.5636552128 +17 18 13.196337192   17.5 19.5 17.51   ~ 68 1
48 QSO B2059+034 Bla 21 01 38.83415344 +03 41 31.3207714   18.13 17.78 17.68   ~ 176 1
49 ICRF J211458.3+283257 Bla 21 14 58.33362526 +28 32 57.1966465   18.6   18.91   ~ 48 1
50 QSO J2123+0535 Bla 21 23 44.51739933 +05 35 22.0930238   18.3 20.40 19.86   ~ 320 1
51 QSO B2134+0028 Bla 21 36 38.58632232 +00 41 54.2128562   17.30 17.08 17.02   ~ 580 2
52 NVSS J220330+100742 rG 22 03 30.95260247 +10 07 42.5863773       21.38   ~ 44 0
53 ICRF J220752.8+165217 Bla 22 07 52.86567746 +16 52 17.8154293   19.5 19.5 19.98   ~ 49 1
54 QSO B2209+236 Bla 22 12 05.96631459 +23 55 40.5438259   19 20.66 19.69   ~ 257 1
55 3C 454.3 Bla 22 53 57.7480438728 +16 08 53.561508864   16.57 16.10 15.22   ~ 3004 2
56 QSO J2257+0243 Bla 22 57 17.56309534 +02 43 17.5116538   18.04 17.96 18.45   ~ 165 1
57 QSO J2320+0513 QSO 23 20 44.85659166 +05 13 49.9526016   18.6 19.0     ~ 166 1
58 QSO B2327+335 Bla 23 30 13.73765966 +33 48 36.4714906     18.5 18.71   ~ 53 1

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