Abstract
THE non-thermal radio source, VRO 42.22.01 (BL Lac), shows linear polarization in both the radio1 and the optical2 regions of its spectrum. The first report of variations in the total flux density of this source included the possible detection of circularly polarized radiation in its emission at 2695 MHz (ref. 3). A recent publication4 describing extensive observations of this object at 2.8 cm and 4.5 cm has shown that the variations in its total flux density are the most rapid detected to date. BL Lac has been monitored since April 1968 at a frequency of 8 GHz (3.75 cm) as part of a programme at the University of Michigan to study the polarization of variable extra -galactic radio sources, and large variations in its linearly polarized emission have been detected.
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
MacLeod, J. M., and Andrew, B. H., Astrophys. Lett., 1, 243 (1968).
Visvanathan, N., Astrophys. J. Lett., 155, L133 (1969).
Biraud, F., and Veron, P., Nature, 219, 254 (1968).
Andrew, B. H., MacLeod, J. M., Locke, J. L., and Medd, W. J., Nature, 223, 598 (1969).
Seielstad, G. A., and Yip, K. B., Nature, 222, 967 (1969).
Aller, H. D., Astrophys. J. (in the press).
Scheuer, P. A. G., and Williams, P. J. S., Ann. Rev. Astron. Astrophys., 6, 321 (1968).
Dent, W. A., and Haddock, F. T., Astrophys. J., 144, 254 (1966).
Dent, W. A., Science, 148, 1458 (1965).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
OLSEN, E. Rapid Variations in the Radio Polarization of BL Lac. Nature 224, 1008–1009 (1969). https://doi.org/10.1038/2241008a0
Received:
Issue Date:
DOI: https://doi.org/10.1038/2241008a0
This article is cited by
-
Radio properties of BL Lac type objects
Nature (1975)
-
Possible Upper Limit to the Distance of BL Lacertae
Nature (1971)
-
Extragalactic Variable Radio Sources
Nature (1970)
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.