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Fourth Cambridge Survey

Alternative names	4C
Website	vizier.cfa.harvard.edu/viz-bin/VizieR-3?-source=VIII%2F4&-out.max=50&-out.form=HTML
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The Fourth Cambridge Survey (4C) is an astronomical catalogue of celestial radio sources as measured at 178 MHz using the 4C Array. It was published in two parts, in 1965 (for declinations +20 to +40) and 1967 (declinations -7 to + 20 and +40 to +80), by the Radio Astronomy Group of the University of Cambridge. References to entries in this catalogue use the prefix 4C followed by the declination in degrees, followed by a period, and then followed by the source number on that declination strip, e.g. 4C-06.23.

The 4C Array, which used the technique of aperture synthesis, could reliably position sources with flux densities of around 2 Jy, to within about 0.35 arcmin in Right ascension and 2.5 arcmin in declination.

References

Pilkington, JDH; Scott, PF (1965). "A survey of radio sources between declinations 20° and 40°". Memoirs of the Royal Astronomical Society. 69: 183. Bibcode:1965MmRAS..69..183P.
Gower, JFR; Scott, PF; Wills, D (1967). "A survey of radio sources in the declination ranges −07° to 20° and 40° to 80°". Memoirs of the Royal Astronomical Society. 71: 49. Bibcode:1967MmRAS..71...49G.

v t e Radio surveys
Cambridge Radio Surveys	1C 2C 3C 4C 5C 6C 7C 8C 9C 10C
Very Large Array	NRAO VLA Sky Survey Faint Images of the Radio Sky at Twenty-Centimeters
Extragalactic sources	GALEX Arecibo SDSS Survey HIPASS Ohio Sky Survey
Pulsars	PALFA Survey
Galactic surveys	C-Band All Sky Survey

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