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

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

2007-05-17

arxiv.org/abs/0705.2548v1

Mon.Not.Roy.Astron.Soc.380:162-174,2007

Astronomy and Astrophysics

Astrophysics

13 pages, 11 figures, 1 table, accepted for publication by MNRAS

Scientific paper

10.1111/j.1365-2966.2007.12028.x

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.

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