Extreme scattering events caused by compact structures in the interstellar medium

Details Extreme scattering events caused by compact structures in the interstellar medium Extreme scattering events caused by compact structures in the interstellar medium

Apr 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987natur.326..675f&link_type=abstract

Nature (ISSN 0028-0836), vol. 326, April 16, 1987, p. 675-678.

Physics

175

Extragalactic Radio Sources, Interstellar Matter, Light Curve, Quasars, Radiant Flux Density, Radio Scattering, Cosmic Plasma, Data Reduction, Minima, Occultation

Scientific paper

Daily flux density measurements of 36 extragalactic radio sources over a seven year period reveal several unusual minima in the light curves that do not follow typical source variations. The observations were performed using the Green Bank interferometer operating at 2.7 and 8.1 GHz. The most significant departure from typical source variability occurred at both frequencies in the quasar 0954+658 between 1980.95 and 1981.3. It is unlikely that this event can be explained by intrinsic variability. The most satisfactory explanation appears to involve refractive focusing by small-scale inhomogeneities in an ionized structure in the interstellar medium.

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