Computer Science
Scientific paper
Dec 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976phdt........12h&link_type=abstract
Ph.D. Thesis - Maryland Univ., 24 Aug. 1976 National Aeronautics and Space Administration. Goddard Space Flight Center, Greenbel
Computer Science
3
Brightness Temperature, Luminous Intensity, Radio Interferometers, Seyfert Galaxies, Algorithms, Flux Density, Relativistic Effects, Relativistic Velocity, Stellar Spectra
Scientific paper
Seven epochs of very long baseline radio interferometric observations of the Seyfert galaxies 3C 120 and 3C 84, at 3.8-cm wave length using stations at Westford, Massachusetts, Goldstone, California, Green Bank, West Virginia, and Onsala, Sweden, have been analyzed for source structure. An algorithm for reconstructing the brightness distribution of a spatially confined source from fringe amplitude and so called closure phase data has been developed and successfully applied to artificially generated test data and to data on the above mentioned sources. Over the two year time period of observation, 3C 120 was observed to consist of a double source showing apparent super relativistic expansion and separation velocities. The total flux changes comprising one outburst can be attributed to one of these components. 3C 84 showed much slower changes, evidently involving flux density changes in individual stationary components rather than relative motion.
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