Fourth Cambridge Survey

4C
Organization	Radio Astronomy Group, University of Cambridge
Wavelength	178 MHz radio
Data sources	4C Array, Mullard Radio Astronomy Observatory
Goals	Deep survey of radio sources
Data products	4C Catalogue
Website Fourth Cambridge Survey

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 of less than 2 Jy, to within about 0.35 arcmin in Right ascension and 2.5 arcmin in declination.

External links

• The Fourth Cambridge Survey on the internet.