VLBI observations of a pulsar's scattering disk

Details VLBI observations of a pulsar's scattering disk VLBI observations of a pulsar's scattering disk

Nov 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...334l..13g&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 334, Nov. 1, 1988, p. L13-L16.

Astronomy and Astrophysics

Astronomy

21

Interstellar Matter, Pulsars, Radiation Distribution, Stellar Envelopes, Very Long Base Interferometry, Electromagnetic Scattering, Kolmogoroff Theory, Least Squares Method, Radio Sources (Astronomy)

Scientific paper

VLBI observations of the scattering disk of pulsar 1933+16 agree with predictions for a Kolmogorov spectrum of density fluctuations in the interstellar plasma. A novel least-squares fit technique was used to self-calibrate the data and fit models to the visibilities. Solving for the spectral index of density fluctuations, alpha, from the visibility as a function of baseline length, alpha(vis) = 3.52 + or - 0.13 is obtained, consistent with alpha = 11/3 for a Kolmogorov spectrum. The scaling of size with frequency agrees with that predicted on the basis of such a spectrum. An upper limit of 1:1.7 is placed on the elongation of the scattered image.

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