Advertisement

The Galactic Distribution of Electron Density Microstructure Inferred from Radio Scattering Observations

  • James Cordes
Chapter
  • 113 Downloads

Abstract

I first review the observables and optics of interstellar seeing associated with radio wavescattering in the interstellar medium. I then describe the Galactic distribution of electron density andits fluctuations, as inferred from a number of observables, including angular and pulse broadening,diffractive scintillations, and dispersion measures. Propects for improving the Galactic model areoutlined.

Keyword

interstellar medium, electron density, turbulence 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. Armstrong, J.W, Rickett, B.J. and Spangler, S.R.: 1995, Electron Density Power Spectrum in the Local Interstellar Medium, Astrophys. J. 443, 209–221.ADSCrossRefGoogle Scholar
  2. Cordes, J.M. and Lazio, T.J.W.: 1991, Interstellar Scattering Effects on the Detection of Narrow-band Signals, Astrophys. J. 376, 123–134.ADSCrossRefGoogle Scholar
  3. Cordes, J.M. and Rickett, B.J.: 1998, Diffractive Interstellar Scintillation Time Scales & Velocities, Astrophys. J. 507, 846–860.ADSCrossRefGoogle Scholar
  4. Cordes, J.M., Weisberg, J.M., Frail, D.A., Spangler, S.R. and Ryan, M.: 1991, The Galactic Distribution of Free Electrons, Nature 354, 121–124.ADSCrossRefGoogle Scholar
  5. Frail, D.A. et al.: 1993, Anisotropic Scattering of OH/IR Stars Toward the Galactic Center, Astrophys. J. Left. 427, L43–46.ADSCrossRefGoogle Scholar
  6. Lazio, T.J.W.: 1997, Genetic Algorithms, Pulsar Planets and Ionized Interstellar Microturbulence, PhD Thesis, Cornell University.Google Scholar
  7. Lazio, T.J.W and Cordes, J.M.: 1998a, The Radial Extent and Warp of the Ionized Galactic Disk. II” Astrophys. J. 497, 238–252.ADSCrossRefGoogle Scholar
  8. Lazio, T.J.W. and Cordes, J.M.: 1998b, Hyperstrong Radio-Wave Scattering in the Galactic Center. I., II, Astrophys. J. 505,715–731.ADSCrossRefGoogle Scholar
  9. Lee, L.C. and Jokipii, J.R.: 1976, The Irregularity Spectrum in Interstellar Space, Astrophys. J. 206, 735–743.ADSCrossRefGoogle Scholar
  10. Rickett, B.J.: 1990, Radio Propagation Through the Turbulent Interstellar Plasma, Annu. Rev. Astron. Astrophys. 28,561–605.ADSCrossRefGoogle Scholar
  11. Taylor, J.H. and Cordes, J.M.: 1993, Pulsar Distances and the Galactic Distribution of Free Electrons, Astrophys. J. 411, 674–684.ADSCrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media Dordrecht 2001

Authors and Affiliations

  • James Cordes
    • 1
  1. 1.Astronomy DepartmentCornell UniversityUSA

Personalised recommendations