Issue |
A&A
Volume 454, Number 3, August II 2006
|
|
---|---|---|
Page(s) | 729 - 740 | |
Section | Extragalactic astronomy | |
DOI | https://doi.org/10.1051/0004-6361:20053885 | |
Published online | 17 July 2006 |
European VLBI network observations of fourteen GHz-peaked-spectrum radio sources at 5 GHz
1
National Astronomical Observatories/Urumqi Observatory, CAS, 40-5 South Beijing Road, Urumqi 830011, PR China e-mail: liux@ms.xjb.ac.cn
2
Joint Institute for VLBI in Europe, Postbus 2, 7990 AA Dwingeloo, The Netherlands e-mail: reynolds@jive.nl
3
ASTRON, Postbus 2, 7990 AA Dwingeloo; and Astronomical Institute, University of Amsterdam, The Netherlands e-mail: strom@astron.nl
4
Dipartimento di Astronomia, Università di Bologna, via Ranzani 1, 40127 Bologna, Italy e-mail: daniele.dallacasa@unibo.it
5
Istituto di Radioastronomia – INAF, via P. Gobetti 101, 40129 Bologna, Italy
Received:
22
July
2005
Accepted:
15
March
2006
We present the results of EVN polarization observations of
fourteen GHz-Peaked-Spectrum (GPS) radio sources at 5 GHz. These
sources were selected from bright GPS source samples and we
aimed at finding Compact Symmetric Objects (CSOs). We have
obtained full polarization 5 GHz VLBI observations of 14 sources
providing information on their source structure and spectral
indices. The results show that two core-jet sources 1433-040 and
DA193, out of 14 GPS sources, exhibit integrated fractional
polarizations of 3.6% and 1.0% respectively. The other 12
sources have no clear detection of pc-scale polarization. The
results confirm that the GPS sources generally have very low
polarization at 5 GHz. The sources 1133+432, 1824+271 and
2121-014 are confirmed as CSOs. Three new CSOs 0914+114,
1518+046 and 2322-040 (tentative) have been classified on the
basis of 5 GHz images and spectral indices. The sources 1333+589,
1751+278 and 2323+790 can be classified either as compact doubles, and
then they are likely CSO candidates or core-jet sources; further
observations are needed for an appropriate classification; 0554-026,
1433-040 and 1509+054 are core-jet sources. In addition, we estimate
that a component in the jet of quasar DA193 has superluminal motion of
in 5.5 years.
Key words: galaxies: active / quasars: general / radio continuum: galaxies
© ESO, 2006
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.