VLBI OBSERVATIONS OF 3C 345 AND NRAO 512 IN RIGHT AND LEFT CIRCULAR POLARIZATION
Files
Links to Files
Permanent Link
Author/Creator ORCID
Date
Type of Work
Department
Program
Citation of Original Publication
Menyuk, C R, I I Shapiro, J J Wittels, H F Hinteregger, C A Knight, A E E Rogers, and A R Whitney. “VLBI OBSERVATIONS OF 3C 345 AND NRAO 512 IN RIGHT AND LEFT CIRCULAR POLARIZATION.” AAS, https://articles.adsabs.harvard.edu/pdf/1978ApJ...220L..27M.
Rights
This work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.
Public Domain
Public Domain
Abstract
In 1975 October, we used the radio telescopes of the Haystack, National Radio Astronomy, and Owens Valley Radio Observatories as an interferometer to monitor, at 8 GHz, the right and left circularly polarized radiation emitted by the quasars 3C 345 and NRAO 512. Using the data for each polarization separately, we estimated several parameters describing a model of the fine structure of the radio brightness of 3C 345, and, subsequently, the angular separation between 3C 345 and NRAO 512. The results for the two polarizations are in approximate agreement, indicating that, to the limit of our resolution (~0.5 milli-arcsec), the fourth Stokes parameter, V, is not significantly different from zero within the compact components of these radio sources. The corresponding quantitative limits on the degree of circular polarization are 0.08 ± 0.07 for 3C 345 and 0.01 ± 0.08 for NRAO 512.