Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980aj.....85..780l&link_type=abstract
Astronomical Journal, vol. 85, July 1980, p. 780-788.
Astronomy and Astrophysics
Astronomy
45
Extragalactic Radio Sources, Radio Astronomy, Radio Spectra, Spatial Distribution, Cosmic Rays, Isotropy, Microwave Emission, Position Errors, Statistical Distributions
Scientific paper
A confusion-limited 4.755-GHz survey covering 0.00956 sr between right ascensions 07h05m and 18h near declination +35 deg has been made with the NRAO 91-m telescope. The survey found 237 sources and is complete above 15 mJy. Source counts between 15 and 100 mJy were obtained directly. The P(D) distribution was used to determine the number counts between 0.5 and 13.2 mJy, to search for anisotropy in the density of faint extragalactic sources, and to set a 99%-confidence upper limit of 1.83 mK to the rms temperature fluctuation of the 2.7-K cosmic microwave background on angular scales smaller than 7.3 arcmin. The discrete-source density, normalized to the static Euclidean slope, falls off sufficiently rapidly below 100 mJy that no new population of faint flat-spectrum sources is required to explain the 4.755-GHz source counts.
Broderick John J.
Brown Raymon L.
Condon James J.
Ledden J. E.
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