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Self-noise in interferometers

Published online by Cambridge University Press:  12 April 2016

M. Vivekanand  and
S.R. Kulkarni
M. Vivekanand
Affiliation:
U.S.R.A., 600 Maryland Avenue, SW, suite 303, West Wing, Washington DC 20024
S.R. Kulkarni
Affiliation:
Owens Valley Radio Observatory, 105-24, California Institute of Technology, Pasadena, CA 91106

Abstract

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We study the distribution of noise in images synthesized by radio interferometers, focusing particularly on the noise due to source power fluctuations. For a total power interferometer, the r.m.s. fluctuation in the image consists of a term that is constant all over the map, which is the uncorrelated system noise divided by the number of telescopes in the interferometer, and a term that is the image itself. For a correlation interferometer the expression is not so simple but is qualitatively similar. Our results are consistent with intuitive expectations in various observing situations. We find similarities in self-noise at optical and radio wavelengths.

Type
Theory of Interferometery
Information
International Astronomical Union Colloquium , Volume 131: Radio Interferometry: Theory, Techniques, and Applications , 1991 , pp. 1 - 5
Copyright
Copyright © Astronomical Society of the Pacific 1991

References

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