The origin of scattering in the inner galaxy

Anantharamaiah, K. R. (1988) The origin of scattering in the inner galaxy American Institute of Physics Conference Proceedings, 174 . pp. 185-189. ISSN 0094-243X

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We argue that the enhanced scattering of radio waves observed at low galactic longitude and latitude is caused by the low-density outer envelopes of HII regions in the inner 8 kpc of the Galaxy. We develop a simple phenomenological theory to estimate the strength of density fluctuations (C2N) in a turbulent medium and apply the theory to the HII envelopes, using the densities and sizes determined from a recent 325 MHz recombination line survey. The predicted values of C2N are in good agreement with the observations.

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