2010A&A...518A..23C


Query : 2010A&A...518A..23C

2010A&A...518A..23C - Astronomy and Astrophysics, volume 518, A23-23 (2010/7-2)

The follow-up european VLBI network observations of twelve GPS radio sources at 5 GHz.

CUI L., LIU X., LIU J., SONG H.-G. and DING Z.

Abstract (from CDS):

Gigahertz peaked spectrum (GPS) radio sources are compact extragalactic radio sources, assumed to be young radio-loud active galactic nuclei and ideal objects for studying the early evolution of extragalactic radio sources. The Very Long Baseline Interferometry (VLBI) observation with high resolution is vital for studying the structure of these compact sources. We defined a sub-sample of twelve GPS sources which have not been observed with the VLBI before, from the Parkes half-Jansky sample, and carried out VLBI observations at 1.6GHz and 5GHz with the European VLBI Network (EVN) in 2006 and 2008, respectively, to classify the source structure and to find compact symmetric objects (CSOs). Additionally, we carried out the 4.85GHz flux density observations for these sources with the Urumqi 25-m telescope between the years 2007 and 2009 to study whether there is any variability in the total flux density of the GPS sources. The results of the 5GHz VLBI observations and total flux densities of these sources are presented in this paper. From the VLBI morphologies, the spectral indices of components and the total flux variability of the twelve targets, we firmly classify three sources J0210+0419, J1135-0021, and J2058+0540 as CSOs, and classify J1057+0012, J1203+0414, and J1600-0037 as core-jet sources. The others J0323+0534, J0433-0229, J0913+1454, J1109+1043, and J1352+0232 are labelled CSO candidates, and J1352+1107 is a complex feature. Apart from core-jet sources, the total flux densities of the CSOs and candidates are quite stable at 5GHz both during a long-term of ∼20 years relative to the PKS90 data and in a period between 2007 and 2009. The total flux densities are resolved-out by more than 20% in the 5GHz VLBI images for 6 sources, probably because of diffuse emission. In addition, we estimated the jet viewing angles (Θ) for the confirmed CSOs by using the double-lobe flux ratio of the sources, the result being indicative of relatively large Θ for the CSOs.

Abstract Copyright:

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

Simbad objects: 15

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Number of rows : 15
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 87GB 020808.1+040519 AG? 02 10 44.5096 +04 19 35.000           ~ 15 1
2 4C 05.14 rG 03 23 20.2607119272 +05 34 11.891999568     19     ~ 75 1
3 4C -02.17 QSO 04 33 54.9 -02 29 56     19.5     ~ 27 1
4 7C 055201.39+394824.00 QSO 05 55 30.80561419 +39 48 49.1649683     18.0 17.5   ~ 492 2
5 87GB 091049.4+150652 G 09 13 34.980 +14 54 20.05           ~ 12 1
6 ICRF J105715.7+001203 G 10 57 15.76744216 +00 12 03.5755040           ~ 25 1
7 87GB 110710.4+110001 G 11 09 46.071 +10 43 43.56           ~ 22 1
8 4C -00.45 AGN 11 35 13.029 -00 21 18.75           ~ 24 1
9 [VV2006] J120321.9+041419 QSO 12 03 21.9376393920 +04 14 19.081466664   19.22 18.89     ~ 64 1
10 3C 286 Sy1 13 31 08.2883506368 +30 30 32.960091564   17.51 17.25     ~ 4170 2
11 DW 1349+02 AGN 13 52 30.697 +02 32 47.28     19     ~ 25 1
12 4C 11.46 AGN 13 52 56.370 +11 07 07.67   20.0       ~ 19 1
13 QSO B1404+286 BLL 14 07 00.39441712 +28 27 14.6901341   16.13 15.35 10.29   ~ 742 2
14 PKS 1557-00 Rad 16 00 01.0136 -00 37 22.590           ~ 17 0
15 4C 05.78 G 20 58 26 +05 40.7           ~ 13 0

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2023.01.30-23:00:56

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