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Self-noise in interferometers

  • M. Vivekanand (a1) and S.R. Kulkarni (a2)

Abstract

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.

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References

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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.
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.
Kulkarni, S.R., 1989, Astron. J., 98, p. 1112.
Prasad, S. and Kulkarni, S.R., 1989, J. Opt. Soc. Am. A, 6, p. 1702.

Self-noise in interferometers

  • M. Vivekanand (a1) and S.R. Kulkarni (a2)

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