Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980mnras.191..739h&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 191, June 1980, p. 739-750. Research supported by the Science Research
Astronomy and Astrophysics
Astronomy
9
Hall Effect, Milky Way Galaxy, Pulsars, Radio Emission, Radio Scattering, Scintillation, Dispersing, Electron Density (Concentration), Electron Distribution, Interstellar Gas, Line Of Sight Communication, Power Spectra, Star Distribution
Scientific paper
The implications that Hall's (1980) model for the origin of the scattering irregularities has for the variation of the radio pulse decorrelation bandwidth (delta nu) with dispersion measure (DM) are investigated. It is shown that it is unlikely that the anomalously low values of delta nu at large DM are due solely to the scattering at large distances being much greater than it is locally. The variation of scattering strength with distance from the galactic plane is also discussed, as well as the effect of nonuniformity of the distribution of electrons in the Galaxy. It is proposed that the lines-of-sight to the pulsars in the (delta nu)-DM diagram that have large dispersion measures pass through regions where the electron density is anomalously low.
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