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Studies of radio sources at 159 Mc/s

Published online by Cambridge University Press:  14 August 2015

S. Archer ,
J. E. Baldwin ,
D. O. Edge ,
B. Elsmore ,
P. A. G. Scheuer  and
J. R. Shakeshaft
S. Archer
Affiliation:
Mullard Radio Astronomy Observatory, Cavendish Laboratory Cambridge, England
J. E. Baldwin
Affiliation:
Mullard Radio Astronomy Observatory, Cavendish Laboratory Cambridge, England
D. O. Edge
Affiliation:
Mullard Radio Astronomy Observatory, Cavendish Laboratory Cambridge, England
B. Elsmore
Affiliation:
Mullard Radio Astronomy Observatory, Cavendish Laboratory Cambridge, England
P. A. G. Scheuer
Affiliation:
Mullard Radio Astronomy Observatory, Cavendish Laboratory Cambridge, England
J. R. Shakeshaft
Affiliation:
Mullard Radio Astronomy Observatory, Cavendish Laboratory Cambridge, England

Extract

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Two years ago the Cambridge 4-aerial interferometer [1] was adapted to work at a frequency of 159 Mc/s, the resolving power thereby being increased by a factor of four over that at the previous frequency, 81.5 Mc/s. The overall beamwidth at 159 Mc/s is 1.2 degrees by 7 degrees but the beam contains interference fringes in two planes at right angles, so that, by phase-switching between the east pair and the west pair of aerials, sources with angular diameters greater than about 7 minutes of arc are eliminated. A survey using this technique has been carried out by Edge and Shakeshaft and may be called a “small diameter” survey. If the phase-switching receiver is connected between the north pair and the south pair of aerials it is possible to record sources with diameters up to about 1 degree and to measure diameters between 2 and 8 minutes of arc. Archer and Baldwin have used the aerial in this way to make a “large diameter” survey. These two surveys will be referred to collectively as the 3C survey.

Type
Part V Discrete Sources and the Universe
Information
Symposium - International Astronomical Union , Volume 9: Paris Symposium on Radio Astronomy , 1959 , pp. 487 - 491
Copyright
Copyright © Stanford University Press 1959 

References

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