Optical identifications of radio sources in the 5C 6 survey

Details Optical identifications of radio sources in the 5C 6 survey Optical identifications of radio sources in the 5C 6 survey

Apr 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979mnras.187..223p&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 187, Apr. 1979, p. 223-235.

Astronomy and Astrophysics

Astronomy

22

Astronomical Photography, Identifying, Microwave Spectra, Optical Measurement, Radio Sources (Astronomy), Background Radiation, Photographic Plates, Star Distribution, Tables (Data)

Scientific paper

The general problem of optically identifying radio sources by using the data available in 5C surveys is analyzed in detail. Positions and finding charts are presented for candidate identifications of radio sources in the 5C 6 survey from deep plates taken with the Palomar 48-inch Schmidt telescope. At 1407 MHz, 26 out of 49 sources for which radio positions of accuracy about 1 arcsec are available are found to have candidate optical identifications; only three of these are expected to be due to chance. A much higher probability of making an identification for extended or flat-spectrum sources is found at this frequency than at 408 MHz. At 408 MHz the positional uncertainties are generally too large to obtain identifications of high reliability. For a sample of 20 bright sources (408-MHz flux density at least 500 mJy), about 30 percent are identified. Overall, the identification percentage at 408 MHz for the remaining 243 sources in the survey is about 17 percent for first nearest neighbors, once allowance is made for background contamination.

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