VLBI OBSERVATIONS OF 3C 345 AND NRAO 512 IN RIGHT AND LEFT CIRCULAR POLARIZATION

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dc.contributor.authorMenyuk, Curtis
dc.contributor.authorShapiro, I. I.
dc.contributor.authorWittels, J. J.
dc.contributor.authorHinteregger, H. F.
dc.contributor.authorKnight, C. A.
dc.contributor.authorRogers, A. E. E.
dc.contributor.authorWhitney, A. R.
dc.date.accessioned2025-06-17T14:45:30Z
dc.date.available2025-06-17T14:45:30Z
dc.date.issued1977-11-25
dc.description.abstractIn 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.
dc.description.sponsorshipWe are indebted to the staffs of the participating observatories for their important aid. Some of the observations reported here were made as part of the Quasar Patrol sponsored by the National Aeronautics and Space Administration and the Jet Propulsion Laboratory. The experimenters at the Massachusetts Institute of Technology were supported in part by the National Science Foundation, grant DES74-22712. Radio astronomy programs at the Haystack Observatory are conducted with support from the National Science Foundation, grant MPS 71-02109 A07. This work also represents one phase of research carried out at the Jet Propulsion Laboratory, California Institute of Technology, under contract NAS 7-100, sponsored by the National Aeronautics and Space Administration. The National Radio Astronomy Observatory is operated by Associated Universities, Inc., under contract with the National Science Foundation.
dc.description.urihttps://articles.adsabs.harvard.edu/pdf/1978ApJ...220L..27M
dc.format.extent3 pages
dc.genrejournal articles
dc.identifierdoi:10.13016/m2sdcu-ovkp
dc.identifier.citationMenyuk, 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.
dc.identifier.urihttps://doi.org/10.1086/182630
dc.identifier.urihttp://hdl.handle.net/11603/38902
dc.language.isoen_US
dc.publisherAAS
dc.relation.isAvailableAtThe University of Maryland, Baltimore County (UMBC)
dc.relation.ispartofUMBC Faculty Collection
dc.relation.ispartofUMBC Computer Science and Electrical Engineering Department
dc.rightsThis 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.
dc.rightsPublic Domain
dc.rights.urihttps://creativecommons.org/publicdomain/mark/1.0/
dc.subjectUMBC Optical Fiber Communications Laboratory
dc.titleVLBI OBSERVATIONS OF 3C 345 AND NRAO 512 IN RIGHT AND LEFT CIRCULAR POLARIZATION
dc.typeText
dcterms.creatorhttps://orcid.org/0000-0003-0269-8433

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