Article | Published:

The galactic distribution of free electrons

Naturevolume 354pages121124 (1991) | Download Citation

Subjects

Abstract

Dispersion, distance and scattering measurements of pulsars and other radio sources are now sufficiently numerous to allow modelling of the entire galactic distribution of free electrons. A two-component axisymmetric model of local electron density, fitted on all scales from 100 km to a few parsecs, accounts for most of the data; a population of dense, discrete clouds is also needed, and there is some evidence for spiral structure.

Access optionsAccess options

Rent or Buy article

Get time limited or full article access on ReadCube.

from$8.99

All prices are NET prices.

References

  1. 1

    Kulkarni, S. R. & Heiles, C. in Galactic and Extragalactic Radio Astronomy (ed. Verschuur, G. L. & Kellermann, K. I.) 95–153 (Springer, New York. 1988).

  2. 2

    Weisberg, J. M., Rankin, J. M. & Boriakoff, V. Astr. Astrophys. 186, 307–311 (1987).

  3. 3

    Frail, D., Cordes, J. M., Weisberg, J. M. & Hankins, T. H. Astrophys. J. (submitted).

  4. 4

    Reynolds, R. J. Astrophys. J. 216, 433–439 (1977).

  5. 5

    Reynolds, R. J. Astrophys. J. 372, L17–20 (1991).

  6. 6

    Cordes, J. M., Rickett, B. J. & Backer, D. C. (eds) Radio Wave Scattering in the Interstellar Medium. AIP Conf. Proc. 174 (American Institute of Physics, New York, 1988).

  7. 7

    Rickett, B. J. Ann. Rev. Astr. Astrophys 28, 561–605 (1990).

  8. 8

    Cordes, J. M., Spangler, S. R., Weisberg, J. M. & Ryan, M. Astrophys. J. (submitted).

  9. 9

    Armstrong, J. W., Cordes, J. M. & Rickett, B. J. Nature 291, 561–564 (1981).

  10. 10

    Cordes, J. M., Weisberg, J. M. & Boriakoff, V. Astrophys. J. 288, 221–247 (1985).

  11. 11

    Lee, L. C. & Jokipii, J. R. Astrophys. J. 206, 735–743 (1976).

  12. 12

    Spangler, S. R. & Gwinn, C. R. Astrophys. 353, L29–32 (1990).

  13. 13

    Cordes, J. M., Wolszczan, A., Dewey, R. J., Blaskiewicz, M. & Stinebring, D. Astrophys. J. 349, 245–261 (1990).

  14. 14

    Phillips, J. A. & Wolszczan, A. Astrophys. J. (submitted).

  15. 15

    Moran, J. M., Rodriguez, L. R., Greene, B. & Backer, D. C. Astrophys. J. 348, 147–152 (1989).

  16. 16

    Molnar, L. et al. Astrophys. J. (submitted).

  17. 17

    Smith, F. G. & Wright, W. C. Mon. Not. R. astr. Soc. 214, 97–107 (1985).

  18. 18

    Hewish, A., Wolszczan, A. & Graham, D. A. Mon. Not. R. astr. Soc. 213, 167–179 (1985).

  19. 19

    Simonetti, J. & Cordes, J. M. Astrophys. J. 216, 134–138 (1977).

  20. 20

    Lazio, J., Spangler, S. R. & Cordes, J. M. Astrophys. J 363, 515–527 (1990).

  21. 21

    Jokipii, J. R. Astrophys. J. 372, 48–57 (1991).

  22. 22

    Manchester, R. N. et al. Nature 352, 219–222 (1991).

  23. 23

    Cordes, J. M. & Lazio, T. J. Astrophys. J. 376, 123–134 (1991).

  24. 24

    Spangler, S. R. & Reynolds, R. J. Astrophys. J. 361, 116–120 (1990).

  25. 25

    Fey, A. L., Spangler, S. R. & Cordes, J. M. Astrophys. J. 372, 132–160 (1991).

  26. 26

    Frail, D. A. & Weisberg, J. M. Astrophys. J. 100, 743–757 (1990).

  27. 27

    Backer, D. C. Astrophys. J. 372 (1991).

  28. 28

    Lyne, A. G., Manchester, R. N. & Taylor, J. H. Mon. Not. R. astr. Soc. 213, 613–623 (1985).

  29. 29

    Rao, A. P. & Slee, O. B. Mon. Not. R. astr. Soc. 234, 853–862 (1988).

  30. 30

    Kassim, N. E., Erickson, W. C. & LaRosa, T. N. in The Galactic Center, AIP Conf. Proc. 155, 196–201 (American Institute of Physics, New York, 1987).

  31. 31

    Kennicutt, R. C. Astrophys. J. 344, 685–703 (1989).

  32. 32

    Higdon, J. C. Astrophys. J. 309, 342–364 (1986).

  33. 33

    Montgomery, D., Brown, M. R. & Matthaeus, W. H. J. geophys. Rev. 92, 282–284 (1987).

Download references

Author information

Affiliations

  1. Astronomy Department and NAIC, Cornell University, Ithaca, New York, 14853, USA

    • J. M. Cordes
  2. Department of Physics and Astronomy, Carleton College, Northfield, Minnesota, 55057, USA

    • J. M. Weisberg
  3. National Radio Astronomy Observatory, Socorro, New Mexico, 87801, USA

    • D. A. Frail
  4. Department of Physics and Astronomy, University of Iowa, Iowa City, Iowa, 52242, USA

    • S. R. Spangler
  5. Department of Physics, Cornell University, Ithaca, New York, 14853, USA

    • M. Ryan

Authors

  1. Search for J. M. Cordes in:

  2. Search for J. M. Weisberg in:

  3. Search for D. A. Frail in:

  4. Search for S. R. Spangler in:

  5. Search for M. Ryan in:

About this article

Publication history

Received

Accepted

Issue Date

DOI

https://doi.org/10.1038/354121a0

Further reading

Comments

By submitting a comment you agree to abide by our Terms and Community Guidelines. If you find something abusive or that does not comply with our terms or guidelines please flag it as inappropriate.