Abstract
IDENTIFICATION of the optical objects associated with radio sources is usually made by using the blue and red photographs of the National Geographic Society–Palomar Observatory Sky Survey (PSS). Objects lying near the radio positions are generally counted as possible identifications if they appear diffuse and are therefore galaxies, or appear stellar and blue, and are therefore quasi-stellar object (QSO) candidates. Only if radio positions of ≲ 1″ accuracy are available can identifications be made with red or neutral stellar objects without gross contamination of the true identifications by foreground galactic stars, most of which appear neutral or red on the PSS prints.
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WILLS, B. Photoelectric photometry of OH471 and OQ172, and other optical objects near radio sources. Nature 251, 691–693 (1974). https://doi.org/10.1038/251691a0
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DOI: https://doi.org/10.1038/251691a0
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