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Extreme Scattering Events

Published online by Cambridge University Press:  03 August 2017

Ralph Fiedler ,
Brian Dennison  and
Kenneth Johnston
Ralph Fiedler
Affiliation:
E. O. Hulburt Center for Space Research, Naval Research Laboratory, Washington, DC, USA
Brian Dennison
Affiliation:
Department of Physics, VPI&SU, Blacksburg, VA, USA
Kenneth Johnston
Affiliation:
E. O. Hulburt Center for Space Research, Naval Research Laboratory, Washington, DC, USA

Abstract

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Dally flux density measurements of 36 extragalactic radio sources over a seven year period, obtained by the Green Bank interferometer, reveal several unusual minima in the light curves that do not follow typical source variations (Fiedler et al. 1987). The most significant departure from typical source variability occurred at both frequencies in the quasar 0954+658 between 1980.95 and 1981.3. Refractive focussing by small scale inhomogeneities in an ionized structure in the interstellar medium appears to be the most likely explanation.

Type
Galactic
Information
Symposium - International Astronomical Union , Volume 129: The Impact of VLBI on Astrophysics and Geophysics , 1988 , pp. 301 - 302
Copyright
Copyright © Reidel 1988 

References

Fiedler, R.L., Dennison, B., Johnston, K.J., and Hewish, A. 1987, Nature, 326, 675.Google Scholar
Pearson, T.J. and Readhead, C.S. 1981, Ap.J., 248, 61.Google Scholar