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Source-noise in radio synthesis images

Published online by Cambridge University Press:  12 April 2016

K.R. Anantharamaiah ,
A.A. Deshpande ,
V. Radhakrishnan ,
R.D. Ekers ,
T.J. Cornwell  and
W.M. Goss
K.R. Anantharamaiah
Affiliation:
Raman Research Institute, Bangalore 560 080, India
A.A. Deshpande
Affiliation:
Raman Research Institute, Bangalore 560 080, India
V. Radhakrishnan
Affiliation:
Raman Research Institute, Bangalore 560 080, India
R.D. Ekers
Affiliation:
Australia Telescope, P.O. Box 76, Epping, NSW 2121, Australia
T.J. Cornwell
Affiliation:
NRAO, Very Large Array, P.O. Box 0, Socorro, NM 87801, USA
W.M. Goss
Affiliation:
NRAO, Very Large Array, P.O. Box 0, Socorro, NM 87801, USA

Abstract

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We discuss the distribution of source- and receiver- noise in radio synthesis images and show that the source-noise is maximum at the position of the source but also appears in the off-source region because of the sidelobes. Analytical expressions are derived for the rms noise at any location of both “total-power” and “correlation” images. We show that under certain conditions, deconvolution can remove the source noise from the off-source region in snap-shot images. Some of the results are verified experimentally.

Type
Theory of Interferometery
Information
International Astronomical Union Colloquium , Volume 131: Radio Interferometry: Theory, Techniques, and Applications , 1991 , pp. 6 - 9
Copyright
Copyright © Astronomical Society of the Pacific 1991

References

Anantharamaiah, K.R., Ekers, R.D., Radhakrishnan, V., Cornwell, T.J. and Goss, W.M. 1989, In Synthesis Imaging in Radio Astronomy, ed. Perley, R.A. Schwab, F.R. and Bridle, A.H., Pub. A.S.P., 6, p431 Google Scholar
Crane, P.C. and Napier, P.J. 1989 in Synthesis Imaging in Radio Astronomy, ed. Perley, R.A., Schwab, F.R. and Bridle, A.H., Pub. A.S.P., 6, p139 Google Scholar
Kulkarni, S.R. 1989, Astron. J., 98, p1112 CrossRefGoogle Scholar