Low Frequency Radio Recombination Lines Towards Cas A

  • R. L. Sorochenko
  • G. T. Smirnov
Part of the Astrophysics and Space Science Library book series (ASSL, volume 163)


Radio recombination lines (RRL) of carbon towards Cas A has now been observed over the range of frequencies 16.7 – 225 MHz. The obtained results allow to deduce ISM parameters in Perseus arm where the lines originate. Satisfactory agreement with the entire observation data is achieved by two models: the “hot” one with Te=50 K and Ne=0. 15 cm-3 and the “cold” one with Te=18 K and Ne=0.3 cm-3. The negative result in attempts to detect hydrogen RRLs with presence of carbon lines make it possible to define the upper limit of hydrogen ionization rate.


Optical Depth Molecular Cloud Dielectronic Recombination Hydrogen Line Carbon Line 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    Anantharamaiah, K.R., Erickson, W.C., and Radhakrishnan, V. 1985, Nature, 315, 647.ADSCrossRefGoogle Scholar
  2. 2.
    Anantharamaiah, K.R., Payne, H.E., and Erickson, W. C. 1988, M.N.R.A.S., 235, 151.ADSGoogle Scholar
  3. 3.
    Blake, D.H., Crutcher, R.M., and Watson, W.D. 1980, Nature, 287, 707.ADSCrossRefGoogle Scholar
  4. 4.
    Brown, D.H. 1980, in Radio Recombination Lines, Ed. P.A. Shaver, Reidel. Publ. Comp., p.127.Google Scholar
  5. 5.
    Casse, J.L., and Shaver, P.A. 1977, Astr. Ap., 61, 805.ADSGoogle Scholar
  6. 6.
    Ershov, A.A., Lekht, E.E., Rudnitskii, C.M., and Sorochenko, R.L. 1982, Sov. Astr. Lett., 8, 374.ADSGoogle Scholar
  7. 7.
    Ershov, A.A., Ilyasov, Yu.P., Lekht, E.E., Smirnov, G.T., Solodkov V.T., and Sorochenko, R.L. 1984, Sov. Astr. Lett., 10, 348.ADSGoogle Scholar
  8. 8.
    Ershov, A.A., Lekht, E.E., Smirnov, G.T., and Sorochenko, R.L. 1987, Sov. Astr. Lett., 13, 8.ADSGoogle Scholar
  9. 9.
    Federman, S.R., Glassgold, A. E., and Kwan, A.E. 1979, Ap. J., 277, 446.Google Scholar
  10. 10.
    Goss, W.M., Kalberla, P. M. W., and Dickel, H. R. 1984, Astr. Ap., 139, 317.ADSGoogle Scholar
  11. 11.
    Heiles, C., and Stevens, M. 1986, Ap.J., 301, 331.ADSCrossRefGoogle Scholar
  12. 12.
    Konovalenko, A.A., and Sodin, L.G. 1979, Sov. Astr. Lett., 5, 663.Google Scholar
  13. 13.
    Konovalenko, A.A., and Sodin, L.G. 1980, Nature, 283, 360.ADSCrossRefGoogle Scholar
  14. 14.
    Konovalenko, A.A., and Sodin, L.G. 1981, Nature, 294, 135.ADSCrossRefGoogle Scholar
  15. 15.
    Konovalenko, A.A. 1984, Sov. Astr. Lett., 10, 353.ADSGoogle Scholar
  16. 16.
    Lekht, E.E., Smirnov, G.T., and Sorochenko, R.L. 1989, Sov. Astr. Lett., 15, 396.Google Scholar
  17. 17.
    Lekht, E.E., Smirnov, G.T., and Sorochenko, R.L. 1990, Sov. Astr. Lett., to be published.Google Scholar
  18. 18.
    Mebold, U., and Hills, D.L. 1975, Astr. Ap., 42, 187.ADSGoogle Scholar
  19. 19.
    Payne, H.E., Anantharamaiah, K. R., and Erickson, W.C. 1989, Ap. J., 341, 890.ADSCrossRefGoogle Scholar
  20. 20.
    Shaver, P.A. 1975, Pramana, 5, 1.ADSCrossRefGoogle Scholar
  21. 21.
    Shaver, P.A., Pedlar, A., and Davies, R. D. 1976, M.N.R.A.S., 177, 45.ADSGoogle Scholar
  22. 22.
    Sorochenko, R.L., and Smirnov, G.T. 1987, Sov. Astr. Lett., 13, 77.ADSGoogle Scholar
  23. 23.
    Spitzer, L. 1978, Physical Processes in the Interstellar Medium, New York: J.Wiley.Google Scholar
  24. 24.
    Ungerechts, H., and Walmsley, CM. 1978, Techn. Bericht. N45, Max-Planck Institut fur Radioastronomie, Bonn.Google Scholar
  25. 25.
    Troland, T.H., Crutcher, R. M., and Heiles, CE. 1985, Ap. J., 298, 808.ADSCrossRefGoogle Scholar
  26. 26.
    Viala, Y. P., and Walmsley, C.M. 1976, Astr. Ap., 50, 1.ADSGoogle Scholar
  27. 27.
    Walmsley, CM., and Watson, W. D. 1982a, Ap. J., 260, 317.ADSCrossRefGoogle Scholar
  28. 28.
    Walmsley, CM., and Watson, W. D. 1982b, Ap. J. Lett., 255, L123.ADSCrossRefGoogle Scholar
  29. 29.
    Watson, W.D., Western, L.R., and Christensen, R.B. 1980, Ap. J., 240, 956.ADSCrossRefGoogle Scholar

Copyright information

© Kluwer Academic Publishers 1990

Authors and Affiliations

  • R. L. Sorochenko
    • 1
  • G. T. Smirnov
    • 1
  1. 1.P.N. Lebedev Physical InstituteUSSR Academy of SciencesMoscowUSSR

Personalised recommendations