Mode of variation of the scattering index parameter in the interstellar medium

Details Mode of variation of the scattering index parameter in the interstellar medium Mode of variation of the scattering index parameter in the interstellar medium

Jul 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981aj.....86.1110o&link_type=abstract

Astronomical Journal, vol. 86, July 1981, p. 1110-1112.

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2

Electromagnetic Scattering, Interstellar Matter, Pulsars, Scattering Coefficients, Astronomical Coordinates, Electron Density (Concentration), Positrons, Scintillation

Scientific paper

Using recent data obtained for decorrelation frequency fν for 20 pulsars with dispersion measure DM ≤ 50 pc cm-3, we investigate whether there is any systematic variation of the scattering index parameter, (2e/L)1/2 = ɛ, in the interstellar medium (ISM). It is found that ɛ appears to vary uniformly in certain regions of the ISM, defined approximately by 110 ≤ Z < 420 pc and with corresponding Galactic coordinates given by 26° < |b| < 87°. Elsewhere, ɛ is found to have a very random variation. The results for ɛ arising from values of fν obtained earlier by other authors are compared with our result. It is observed that more data are required before a definite conclusion on the mode of variation of ɛ can be made.

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