Interstellar scattering of pulsar radiation. I - Scintillation

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Interstellar Gas, Light Scattering, Pulsars, Scintillation, Stellar Spectra, Computerized Simulation, Electron Density (Concentration), Galactic Evolution, Normal Density Functions, Radiant Flux Density, Spectrum Analysis, Wave Dispersion

Scientific paper

An investigation of the intensity fluctuations of 28 pulsars near 0.4 GHz indicates that spectra of interstellar scintillation are consistent with a Gaussian shape, that scintillation indices are near unity, and that the scintillation bandwidth depends linearly on dispersion measure. Observations at cm wavelengths show that the observer is in the near field of the scattering medium for objects with the lowest dispersion measures, and confirm the steep dependence of correlation bandwidth on dispersion measure found by Sutton (1971). The variations of scattering parameters with dispersion measure may indicate that the rms deviation of thermal electron density on the scale of 10 to the 11th cm grows with path length through the galaxy.

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