High accuracy measurements of linear and circular polarization at lambda 49 cm.
Abstract
Measurements at 49 cm (610 MHz) of the linear and circular polarizations of 37 unresolved radio sources are presented. Techniques for analysis of the data in the Fourier plane are developed, eliminating the need for Fourier transformation to the sky plane. With accuracies of polarization measurement generally better than 0.1%, the small amounts of linear polarization at 49 cm are often detectable. Circular polarization is probably detected in seven sources and suspected in one other. Each of these eight sources exhibits one or more of the following properties: very compact components, an unusual radio spectrum (such as centimeter excess, positive curvature, or complex structure), and total flux variability. For two of the sources (1127-145 and 2134+004) the variation of percentage circular polarization with wavelength is discussed.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- June 1977
- Bibcode:
- 1977A&A....58...17W
- Keywords:
-
- Circular Polarization;
- Polarimetry;
- Polarized Electromagnetic Radiation;
- Radio Astronomy;
- Radio Sources (Astronomy);
- Centimeter Waves;
- Data Reduction;
- Depolarization;
- Error Analysis;
- Faraday Effect;
- Radio Telescopes;
- Tables (Data);
- Astronomy