The B3–VLA CSS sample
Open Access
- 28 October 2004
- journal article
- Published by EDP Sciences in Astronomy & Astrophysics
- Vol. 427 (2), 465-483
- https://doi.org/10.1051/0004-6361:20040460
Abstract
We discuss VLA polarization measurements at 8.5, 4.9 and 1.4 GHz for the B3-VLA sample of Compact Steep-spectrum Sources (CSS). The measurements at the two higher frequencies were presented in a previous paper (Fanti et al. [CITE]), while those at 1.4 GHz are from the NVSS. The study of the fractional polarization as a function of wavelength shows a variety of behaviours not always accounted for by the current simple models. In a large fraction of sources the integrated rotation angle appears to follow the law down to 1.4 GHz, although this conclusion has to be treated with some care due to the small number of polarization measurements. For sources resolved at the two higher frequencies we find that a number exhibit asymmetries in the 8.5 GHz fractional polarization, in depolarization and rotation angle. We discuss depolarization effects and rotation of the polarization angle. We find that Faraday depth effects are very strong within 2-3 kpc of the nucleus, as found earlier by Cotton et al. ([CITE]). A simple model for an external Faraday screen is able to account for the gross observed features. We also find that the Rotation Measure and the Faraday Dispersion appear to increase with the source red-shift.Keywords
This publication has 29 references indexed in Scilit:
- Correlation of the magnetic field and the intra-cluster gas density in galaxy clustersAstronomy & Astrophysics, 2001
- Multi-frequency VLA observations of a new sample of CSS/GPS radio sourcesAstronomy & Astrophysics, 2001
- The Morphology of the Emission-Line Region Of Compact Steep-Spectrum Radio SourcesThe Astronomical Journal, 2000
- Optical‐Radio Alignment in Compact Steep‐Spectrum Radio SourcesThe Astrophysical Journal, 1999
- Large differential Faraday rotation in the compact steep-spectrum quasar 3C 147 and jet-medium interactionsMonthly Notices of the Royal Astronomical Society, 1999
- The NRAO VLA Sky SurveyThe Astronomical Journal, 1998
- Unification of the Radio and Optical Properties of Gigahertz Peak Spectrum and Compact Steep‐Spectrum Radio SourcesThe Astrophysical Journal, 1997
- Asymmetric depolarization in double radio sources with one-sided jetsMonthly Notices of the Royal Astronomical Society, 1991
- A systematic asymmetry in the polarization properties of double radio sources with one jetNature, 1988
- On the Depolarization of Discrete Radio Sources by Faraday DispersionMonthly Notices of the Royal Astronomical Society, 1966