Hostname: page-component-84b7d79bbc-g7rbq Total loading time: 0 Render date: 2024-07-30T04:57:34.675Z Has data issue: false hasContentIssue false
  • English
  • Français

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

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

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 

References

Armstrong, J., et al. 1990, ApJ , 358, 685.Google Scholar
Backer, D.C. 1994, this conference Google Scholar
Bally, J., Yusef-Zadeh, F. 1989, ApJ , 336, 173.Google Scholar
Clegg, A.W., Cordes, J.M., Simonetti, J.H. and Kulkarni, S.R. 1992, ApJ , 386, 143.CrossRefGoogle Scholar
Frail, D.A., Diamond, P.J., Cordes, J.M. and van Langevelde, H.J. 1994, ApJ , 427, L43. Gray, A.D. 1994, PhD. Thesis, University of Sydney.Google Scholar
Higdon, J.C. 1993, ApJ , 285, 109.Google Scholar
Inoue, M. et al. 1984, Pub. Astron. Soc. Japan. , 36, 633.Google Scholar
Lindqvist, M., Habing, H.J. and Winnberg, A. 1992, A.A. , 259 118.Google Scholar
Lo, et al. 1993, Nature , 362, 38.Google Scholar
Morris, M. 1994, this conference. Google Scholar
Narayan, R., et al. 1989, MNRAS , 241, 403.Google Scholar
Mezger, P.G., and Pauls, T. 1985, in IAU Symposium No. 84 , ed. Burton, W.B., Reidel, Dordrecht, p. 357.Google Scholar
Morris, M. 1994, this conference. Google Scholar
Serabyn, E., Lacy, J.H., and Achtermann, J.M. 1991, ApJ , 378, 557.Google Scholar
Simonetti, J.H. and Cordes, J.M. 1988, in AIP 174, Radio Waves Scattering in the Interstellar Medium , ed. Ricket, B.J. and Backer, D.C. (NY:AIP)Google Scholar
van Langevelde, H.J., Frail, D.A., Cordes, J.M. and Diamond, P.J. 1992, ApJ , 396, 686.Google Scholar
Yusef-Zadeh, F., 1989, IAU Symposium No. 136, The Center of the Galaxy , ed. Morris, M., Kluwer, Dordrecht, p. 243.Google Scholar
Yusef-Zadeh, F. et al. 1995, in preparation. Google Scholar
Yusef-Zadeh, F. and Morris, M. 1987, ApJ , 322, 721.Google Scholar