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Speckles in Interstellar Radio-Wave Scattering

Published online by Cambridge University Press:  12 April 2016

K. M. Desai ,
C. R. Gwinn ,
J. Reynolds ,
E. A. King ,
D. Jauncey ,
G. Nicholson ,
C. Flanagan ,
R.A. Preston  and
D.L. Jones
K. M. Desai
Affiliation:
Physics Department, UCSB, Santa Barbara, CA 93106USA
C. R. Gwinn
Affiliation:
Physics Department, UCSB, Santa Barbara, CA 93106USA
J. Reynolds
Affiliation:
Australia Telescope, PO Box 76, Epping, NSW 2121, AUSTRALIA
E. A. King
Affiliation:
Australia Telescope, PO Box 76, Epping, NSW 2121, AUSTRALIA
D. Jauncey
Affiliation:
CSIRO, PO Box 76, Epping, NSW 2121, AUSTRALIA
G. Nicholson
Affiliation:
Hartebeesthoek Radio Astronomy Observatory, P.O. Box 443, Krugersdorp 1740, SOUTH AFRICA
C. Flanagan
Affiliation:
Hartebeesthoek Radio Astronomy Observatory, P.O. Box 443, Krugersdorp 1740, SOUTH AFRICA
R.A. Preston
Affiliation:
Jet Propulsion Laboratory, 4809 Oak Grove Drive, Pasadena, CA 91109, USA
D.L. Jones
Affiliation:
Jet Propulsion Laboratory, 4809 Oak Grove Drive, Pasadena, CA 91109, USA

Abstract

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Observations of speckles in the scattering disk of the Vela pulsar are presented and speckle techniques for studying and circumventing scattering of radio waves by the turbulent interstellar plasma are discussed. The speckle pattern contains, in a hologrammatic fashion, complete information on the structure of the radio source as well as the distribution of the scattering material. Speckle observations of interstellar scattering of radio waves are difficult because of their characteristically short timescales (≈seconds) and narrow bandwidths (≈kHz). Here, we present first observations, taken at 13 cm wavelength with elements of the SHEVE VLBI network, of speckles in interstellar scattering.

Type
Imaging
Information
International Astronomical Union Colloquium , Volume 131: Radio Interferometry: Theory, Techniques, and Applications , 1991 , pp. 238 - 241
Copyright
Copyright © Astronomical Society of the Pacific 1991

References

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