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The Nature of the Scattering and Faraday Screens Toward the Galactic Center

  • F. Yusef-Zadeh (a1), P. Parastaran (a1), M. Wardle (a2) and K. Uchida (a3)

Abstract

We probe the relationship between the scattering and Faraday screens toward the Galactic center by examining the scattering properties of Sgr A and OH/IR stars and by measuring the rotation measure distribution of an extended nonthermal filament. The unusually large rotation and scattering measures, the evidence for anisotropic scattering, and the anisotropy in the rotation measure structure function, suggest that the Faraday and scattering media are located near the Galactic center. The results presented here are consistent with a turbulent medium of magnetized thermal electrons with the outer scale of electron density and magnetic field fluctuations being of the order of 5 × 10–4 and 2 pcs, respectively.

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