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

Published online by Cambridge University Press:  25 May 2016

F. Yusef-Zadeh ,
P. Parastaran ,
M. Wardle  and
K. Uchida
F. Yusef-Zadeh
Affiliation:
Northwestern University, Department of Physics and Astronomy, Evanston, Il 60208
P. Parastaran
Affiliation:
Northwestern University, Department of Physics and Astronomy, Evanston, Il 60208
M. Wardle
Affiliation:
University of Rochester, Department of Physics and Astronomy, Rochester, N.Y. 14627
K. Uchida
Affiliation:
Max-Planck-Institute fur Radioastronomy, Bonn, Germany

Abstract

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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.

Type
Chapter 3: What is the Nature of the Center of the Galaxy?
Information
Symposium - International Astronomical Union , Volume 169: Unsolved Problems of the Milky Way , 1996 , pp. 271 - 277
Copyright
Copyright © Kluwer 1996 

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