Abstract
IN a recent publication we reported the detection of linearly polarized OH emission from a localized region near the radio source W3 (ref. 1). Although the mechanism of production of the polarized emission was not understood, we pointed out that, among several possible mechanisms, the Zeeman effect was unique because it alone would give rise to circularly polarized radiation. This communication reports observations made with a circularly polarized feed horn on the 140 ft. radio telescope of the National Radio Astronomy Observatory, Green Bank, West Virginia, between November 11 and 12, 1965. The-receiver used was an autocorrelation-type radiometer with 100 channels2. Bandwidths of 2.5 Mc/s, 625, 250, 62.5 and 15.6 kc/s could be studied with a frequency resolution of 0.012 of the bandwidth. Therefore, on some occasions, our maximum frequency resolution was 190 c/s. The system temperature, including losses in the antenna feed line, was 250° K; the antenna beamwidth was 19 min of are; coupling between the two senses of circular polarization in the antenna feed horn was approximately − 15 db.
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
Weinreb, S., Meeks, M. L., Carter, J. C., Barrett, A. H., and Rogers, A. E. E., Nature, 208, 440 (1965).
Shalloway, A. M., Northeast Electronics Research and Engineering Meeting Record, November 4–6, 1964.
McGee, R. X., Robinson, B. J., Gardner, F. F., and Bolton, J. G., Nature, 208, 1193 (1965).
Münch, G., Astrophys. J., 140, 107 (1964).
Born, M., and Wolf, E., Principles of Optics, 555 (Pergamon Press, Macmillan Company, New York, 1964).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
BARRETT, A., ROGERS, A. Observations of Circularly Polarized OH Emission and Narrow Spectral Features. Nature 210, 188–190 (1966). https://doi.org/10.1038/210188b0
Issue Date:
DOI: https://doi.org/10.1038/210188b0
This article is cited by
-
Mirrorless lasers
Pramana (2002)
-
A classification of the available astrophysical data of particular Hii regions
Astrophysics and Space Science (1979)
-
Amplified Spontaneous Emission and OH Molecules in the Interstellar Medium
Nature Physical Science (1972)
-
A Search for the ⋀Doublet Transition in the 2Π1/2, J=1/2 State of OH
Nature (1967)
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.