Hostname: page-component-cd9895bd7-mkpzs Total loading time: 0 Render date: 2024-12-26T04:37:01.099Z Has data issue: false hasContentIssue false
  • English
  • Français

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

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

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

Anantharamiah, K.R., Ekers, R.D., Radhakrishnan, V., Cornwell, T.J. and Goss, W.M., 1988, in Synthesis Imaging In Radio Astronomy, ed. Perley, R.A., Schwab, F.R. and Bridie, A.H., Pub. A.S.P., 6, p. 431.Google Scholar
Crane, P.C. and Napier, P.J., 1988, in Synthesis Imaging In Radio Astronomy. ed. Perley, R.A., Schwab, F.R. and Bridie, A.H., Pub. A.S.P., 6, p. 139.Google Scholar
Kulkarni, S.R., 1989, Astron. J., 98, p. 1112.Google Scholar
Prasad, S. and Kulkarni, S.R., 1989, J. Opt. Soc. Am. A, 6, p. 1702.Google Scholar