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Issue A&A
Volume 426, Number 2, November I 2004
Page(s) 463 - 470
Section Extragalactic astronomy
DOI http://dx.doi.org/10.1051/0004-6361:20041204



A&A 426, 463-470 (2004)
DOI: 10.1051/0004-6361:20041204

The B3-VLA CSS sample

V. VLBA images at 6 and 3.6 cm
M. Orienti1, 2, D. Dallacasa1, 2, C. Fanti2, 3, R. Fanti2, 3, S. Tinti4 and C. Stanghellini5

1  Dipartimento di Astronomia, Università di Bologna, via Ranzani 1, 40127 Bologna, Italy
    e-mail: orienti@ira.cnr.it
2  Ist. di Radioastronomia - CNR, via Gobetti 101, 40129 Bologna, Italy
3  Dipartimento di Fisica, Università di Bologna, via Irnerio 46, 40126 Bologna, Italy
4  SISSA/ISAS, Via Beirut 4, 34014 Trieste, Italy
5  Ist. di Radioastronomia - CNR, CP 141, 96017 Noto (SR), Italy

(Received 30 April 2004 / Accepted 6 July 2004 )

Abstract
We present the results of VLBA observations at 6 and 3.6 cm for eighteen Compact Steep Spectrum radio sources (CSS) from the B3-VLA CSS sample. In most cases these VLBA images display a "Double/Triple" morphology, and the core is unambiguously detected in seven sources. Multifrequency images allow us to study the spectral properties of the individual source components and to constrain the spectral age. In lobe-dominated sources the radiative ages deduced from the synchrotron theory are in the range of up $5\times 10 ^{3}$ years, if equipartition magnetic field is assumed. Polarized emission is detected at a few percent level for two sources only. They were the only two sources displaying polarized emission in VLA A configuration data, and this implies that beam depolarization is not effective in reducing the integrated fractional polarization for these sources.


Key words: galaxies: active -- galaxies: nuclei -- radio continuum: galaxies -- galaxies: quasars: general -- polarization

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© ESO 2004


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