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- W2015233973 abstract "view Abstract Citations (42) References (26) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Image-tube photography of a complete sample of 4C radio sources. Uomoto, A. K. ; Wills, B. J. ; Wills, D. Abstract Image-tube photographs have been obtained in the fields of over 200 4C radio sources. The incidence of highly variable QSOs is much lower than that found among objects in higher-frequency radio surveys; none of the 130 fields which were blank to about 20 mag at the epoch of the Palomar Sky Survey (1950-1956) now contains an object not exceeding 19.5-20 mag, and of the 35 known QSOs in the sample, only about one-third show a change greater than 0.2 mag since the Sky Survey. There is a negative correlation between the amount of variability and the absolute optical luminosity of the QSOs. Optical identifications for a uniform sample of 232 4C sources are summarized; they include some new ones made as a result of this study. Publication: The Astronomical Journal Pub Date: November 1976 DOI: 10.1086/111969 Bibcode: 1976AJ.....81..905U Keywords: Astronomical Catalogs; Astronomical Photography; Luminous Intensity; Quasars; Radio Sources (Astronomy); Histograms; Red Shift; Sky Surveys (Astronomy); Variability; Astronomy full text sources ADS | data products SIMBAD (232) Related Materials (1) Erratum: 1977AJ.....82..239U" @default.
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- W2015233973 title "Image-tube photography of a complete sample of 4C radio sources" @default.
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