The polarization in the JVAS/CLASS flat-spectrum radio sources: II. A search for aligned radio polarizations

Abstract

We have used the very large JVAS/CLASS 8.4-GHz surveys of flat-spectrum radio sources to test the hypothesis that there is a systematic alignment of polarization position angle vectors on cosmological scales of the type claimed by Hutsemekers et al (2005). The polarization position angles of 4290 sources with polarized flux density >=1 mJy have been examined. They do not reveal large-scale alignments either as a whole or when split in half into high-redshift (z >= 1.24) and low-redshift sub-samples. Nor do the radio sources which lie in the specific areas covered by Hutsemekers et al (2005). show any significant effect. We have also looked at the position angles of parsec-scale jets derived from VLBI observations and again find no evidence for systematic alignments. Finally, we have investigated the correlation between the polarization position angle and those of the parsec-scale jets. As expected, we find that there is a tendency for the polarization angles to be perpendicular to the jet angles. However, the difference in jet and polarization position angles does not show any systematic trend in different parts of the sky.

arXiv comment13 pages, 11 figures, 1 table, accepted for publication by MNRAS

References in corpus (26)

• HEALPix -- a Framework for High Resolution Discretization, and Fast Analysis of Data Distributed on the Sphere
• The axis of evil
• Is the low-l microwave background cosmic?
• The Cosmic Lens All-Sky Survey: I. Source selection and observations
• Sub-milliarcsecond Imaging of Quasars and Active Galactic Nuclei. IV. Fine Scale Structure
• The Cosmic Lens All-Sky Survey:II. Gravitational lens candidate selection and follow-up
• The VLBA Calibrator Survey - VCS1
• The VLBA Imaging and Polarimetry Survey at 5 GHz
• Indication of Anisotropy in Electromagnetic Propagation over Cosmological Distances
• Mapping extreme-scale alignments of quasar polarization vectors
• Is there evidence for cosmic anisotropy in the polarization of distant radio sources?
• The Third VLBA Calibrator Survey
• The Fifth VLBA Calibrator Survey: VCS5
• The Fourth VLBA Calibrator Survey - VCS4
• A View through Faraday's Fog 2: Parsec Scale Rotation Measures in 40 AGN
• Confirmation of the existence of coherent orientations of quasar polarization vectors on cosmological scales
• Sub-Milliarcsecond Imaging of Quasars and Active Galactic Nuclei. II. Additional Sources
• Intrinsic Differences in the Inner Jets of High- and Low-Optically Polarized Radio Quasars
• Observational Evidence Against Birefringence Over Cosmological Distances
• A survey of polarization in the JVAS/CLASS flat-spectrum radio source surveys: I. The data and catalogue production
• Probing Light Pseudoscalars with Light: Propagation, Resonance and Spontaneous Polarization
• Quasar-Galaxy and Galaxy-Galaxy Cross-Correlations: Model Predictions with Realistic Galaxies
• Comment on the Appropriate Null Hypothesis for Cosmological Birefringence
• Optical Polarization of 52 Radio-Loud QSOs and BL Lac Objects
• Bayesian Analysis of the Polarization of Distant Radio Sources: Limits on Cosmological Birefringence
• Evolution of polarization orientations in a flat universe with vector perturbations: CMB and quasistellar objects

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