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Speckles in Interstellar Radio-Wave Scattering

  • K. M. Desai (a1), C. R. Gwinn (a1), J. Reynolds (a2), E. A. King (a2), D. Jauncey (a3), G. Nicholson (a4), C. Flanagan (a4), R.A. Preston (a5) and D.L. Jones (a5)...

Abstract

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.

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References

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Cornwell, T.J., Anantharamaiah, K.R. and Narayan, R., 1988 Spatial Coherence in a Scatter-Broadened Image - Observations of 3C279 Close to the Sun in Radio Wave Scattering in the Interstellar Medium, AIP Conf. Proc. 174. ed. Cordes, J.M., Rickett, B.J., and Backer., D.C., pp. 9296.
Thompson, A.R., Moran, J.M., and Swenson, G.W. Jr., Interferometry and Synthesis in Radio Astronomy, John Wiley & Sons, 1986.
Wolszczan, A. and Cordes, J.M., 1987, Interstellar Interferometry of the Pulsar PSR 1237+25. Ap. J. Let. 320, L35.

Speckles in Interstellar Radio-Wave Scattering

  • K. M. Desai (a1), C. R. Gwinn (a1), J. Reynolds (a2), E. A. King (a2), D. Jauncey (a3), G. Nicholson (a4), C. Flanagan (a4), R.A. Preston (a5) and D.L. Jones (a5)...

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