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A&A 385, 768-777 (2002)
DOI: 10.1051/0004-6361:20020162
EVN observations of candidate Compact Symmetric Objects
L. Xiang1, C. Stanghellini2, D. Dallacasa3, 4 and Z. Haiyan51 National Astronomical Observatories, Chinese Academy of Sciences, Urumqi 830011, PR China
e-mail: liux@ms.xjb.ac.cn
2 Istituto di Radioastronomia del CNR, C.P. 141, 96017 Noto SR, Italy
3 Istituto di Radioastronomia del CNR, via P. Gobetti 101, 40129 Bologna, Italy
4 Dipartimento di Astronomia, Alma Mater Studiorum, via Ranzani 1, 40127 Bologna, Italy
e-mail: ddallaca@ira.cnr.it
5 National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, PR China
e-mail: hyzhang@class1.bao.ac.cn
(Received 14 September 2001 / Accepted 28 January 2002 )
Abstract
We present pc-scale images of ten Compact Symmetric Objects (CSO) candidates
observed with the European VLBI network (EVN).
Five radio sources have been observed at 1.6 GHz, and five more at 2.3/8.4 GHz, the latter
subsample with the inclusion in the VLBI array of 3 antennae normally used for geodesy.
These objects were selected from existing samples of GHz Peaked Spectrum
(GPS) radio sources with the purpose to find and/or confirm the CSO
classification. These new VLBI observations allow us to
confirm the classification of two CSO candidates, and
to find a few new ones. The association of GPS radio galaxies with
a CSO morphology is strengthened by our findings, and this
result suggests an efficient way to increase the
number of known CSOs by means of VLBI observations of
compact radio galaxies showing a convex radio spectrum.
Key words: galaxies: active -- quasars: general -- radio continuum: galaxies
Offprint request: C. Stanghellini, cstan@ira.cnr.it
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