Abstract
There are several radio sources with Faraday rotation measures larger than 500 rad m−2 (ref. 1). Because most of these sources are located near the galactic plane, the large rotation measures can be attributed to the galactic medium2. However, a few sources at high galactic latitude also show large rotation, implying intrinsic Faraday rotation within the source. Until now, no sources have been discovered to have a rotation measure > 1,000 rad m−2. Using a multichannel polarimeter at 10 GHz attached to the 45-m radio telescope at Nobeyama, we have observed about 100 extragalactic radio sources which were suspected to have large rotation from our polarization catalogue1. Four of these 100 sources were found to have an intrinsic rotation measure > 1,000 rad m−2. Here we report rotation measures which are two orders of magnitude larger than those observed so far for most extragalactic radio sources. Two of these four sources are classified as compact steep-spectrum sources.
This is a preview of subscription content, access via your institution
Access options
Subscribe to this journal
Receive 51 print issues and online access
$199.00 per year
only $3.90 per issue
Buy this article
- Purchase on Springer Link
- Instant access to full article PDF
Prices may be subject to local taxes which are calculated during checkout
Similar content being viewed by others
References
Tabara, H. & Inoue, M. Astr. Astrophys. Suppl. 39, 379–393 (1980).
Inoue, M. & Tabara, H. Publs astr. soc. Japan 33, 603–615 (1981).
Burn, B. J. Mon. Not. R. astr. Soc. 133, 67–83 (1966).
Inoue, M. et al. Publs astr. soc. Japan 36, 633–638 (1984).
Simard-Normandin, M. et al. Astrophys. J. Suppl. Ser. 45, 97–111 (1981).
Dreher, J. W. et al. Astrophys. J. 316, 611–625 (1987).
Wilkinson, P. N. IAU Symp. 97, 149–156 (1982).
Pearson, T. J. et al. Astr. J. 90, 738–755 (1985).
Fanti, C. et al. Astr. Astrophys. 170, 10–19 (1986).
Preuss, E. et al. IAU Symp. 97, 289–290 (1982).
van Breugel, W. J. M. Astr. J. 89, 5–22 (1984).
Wilkinson, P. N. et al. Nature 308, 619–621 (1984).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Kato, T., Tabara, H., Inoue, M. et al. Extragalactic radio sources with very large Faraday rotation. Nature 329, 223–224 (1987). https://doi.org/10.1038/329223a0
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1038/329223a0
This article is cited by
-
Compact steep-spectrum and peaked-spectrum radio sources
The Astronomy and Astrophysics Review (2021)
-
Upper limits to the magnetism of the shell around the Bootes Void
Astrophysics and Space Science (1991)
Comments
By submitting a comment you agree to abide by our Terms and Community Guidelines. If you find something abusive or that does not comply with our terms or guidelines please flag it as inappropriate.