Review of Decameter Wave Recombination Lines: Problems and Methods

  • A. A. Konovalenkc
Chapter
Part of the Astrophysics and Space Science Library book series (ASSL, volume 163)

Abstract

There we present the main investigation results of the radio recombination lines in the decameter wave range. The detection 10 yeas ago of carbon lines with quantum numbers n > 600 at v < 30 MHz gave new possibilities for studying characteristics of low density interstellar plasma. The most complete data have been received for the source of Cas A. Some problems with regard to choosing a model for the medium forming the carbon lines in the decameter range (n= 768 – 603) and for shorter waves (up to n = 273) have not yet been solved definitively. The methods of high sensetive and interference-proof decameter radio spectroscopy using the UTR-2 radiotelescope allow to record recombination lines of the excited carbon for different components of the interstellar medium.

Keywords

Optical Depth Interstellar Medium Recombination Line Carbon Line Interstellar Plasma 
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.
This is a preview of subscription content, log in to check access

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. Anantharamaiah, K.E., Erickson, W.C. and Radhakrish-nan, V. (1985) ‘Observations of highly excited carbon radio recombination lines towards Cassiopeia A’, Nature 315, 647–649.ADSCrossRefGoogle Scholar
  2. Anantharamaiah, K.R., Payne, H.E. and Erickson, W.S. (1988) ‘Detection of carbon recombination lines below 100 MHz towards Galactic Centre and M16’, Mon. Not. R. Astr. Soc. 235, 151–160.ADSGoogle Scholar
  3. Blake, D.H., Crutcher, R.M. and Watson, W.D. (1980) ‘Identification of the anomalous 26.13 MHz nitrogen line observed towards Cassiopaia A’, Nature 287, 707–709.ADSCrossRefGoogle Scholar
  4. Braude, S.Ta., Megn, A.V. and Sodin, L.G.(1978) ‘Radiotélescope of the decameter range UTR-2’, Antennas (Sov.) 26, 3–15.ADSGoogle Scholar
  5. Ershov, A.A., Iliasov, Yu.P., Leht, E.E., Smirnov, G. T., Solodkov, V.T. and Sorochenko, R.L.(1984) ‘The low frequency excited carbon radio lines towards Cassiopeia A. Observations at frequencies 42,57 and 84 KHz’, Sov. Astron. J. Lett. 10, 833–845.Google Scholar
  6. Gee, CS., Percival, I.C. and Richards, D.(1976) ‘Theoretical rates for electron excitation of highly excited atoms’, Mon. Not. R. Astr. Soc. 175, 209–215.ADSGoogle Scholar
  7. Konovalenko, A.A. and Sodin, L.G. (1979) ‘Negative result of an attempt to detect hydrogen recombination lines at decameter waves’, Sov. Astron. J. Lett. 5, 663–664.Google Scholar
  8. Konovalenko, A.A. and Sodin, L.S. (1980) ‘Neutral 14N in the interstellar medium’, Nature 283, 360–361.ADSCrossRefGoogle Scholar
  9. Konovalenko, A.A. and Sodin, L.G.(1981) ‘The 26.13MHz absorption line in the direction of Cassiopeia A’, Nature 294, 135–136.ADSCrossRefGoogle Scholar
  10. Konovalenko, A.A.(1984) ‘Observations of carbon recombination lines at decameter wavelengths in the direction of Cassiopeia A’, Sov.Astron. J. Lett. 10, 846–852.Google Scholar
  11. Konovalenko, A.A.(1987) ‘An investigations of carbon recombination lines in cosmic radioemission of the decameter range’, Herald of the Academy of Sciences of the Ukrainian SSR (Sov.) 4, 17–31.Google Scholar
  12. Konovalenko, A.A.(1984) ‘Decameter excited carbon lines in certain galactic objects’, Sov. Astron. J. yeet. 10, 912–917.Google Scholar
  13. Leht, E.E., Smirnov, G.T. and Sorochenko, R.L.(1989) ‘Observations of the atoms in excitation levels close to the limit in the Galaxy’, Sov. Astron. J.Lett 15, 396–399.Google Scholar
  14. Payne, H.E., Anantharamaiah, K.R. and Erickson, W.C (1989) ‘Stimulated emission of carbon recombination lines from cold clouds in the direction of Cassiopeia A’, The Astrophysical J. 341, 890–900.ADSCrossRefGoogle Scholar
  15. Pedlar, A. and Davies, E.D.(1980) ‘Low frequency recombination lines’, in P.A. Shaver (ed.), Radio Recombination Lines, Reidel, Dordrecht, pp. 171–183.Google Scholar
  16. Pedlar, A., Hart, P., Davies, R.D. and Shaver, P.A. (1978) ‘Studies of low frequency recombination lines from the direction of the Galactic centre and other galactic sources’, Mon. Not. R. Astr. Soc. 182, 473–488.ADSGoogle Scholar
  17. Shaver, P.A. (1975) ‘Theoretical intensities of low frequency recombination lines’, Pramana 5, 1–28.ADSCrossRefGoogle Scholar
  18. Walmsley, C.M. and Watson, W.D. (1982) ‘The influence of dielectronic-like recombination at low temperatures on the interpretation of interstellar, radio recombination lines of carbon’, The Astrophysical J. 260, 317–325.ADSCrossRefGoogle Scholar
  19. Walmsley, C.M. and Watson, W.D. (1982) ‘Very high Ridberg states (n=600) of carbon in the interstellar gas’, The Astrophysical J.(Letters) 255, L123-L127.ADSCrossRefGoogle Scholar
  20. Watson, W.D., Western, L.R., and Christensen, R.B. (1980) ‘A new, dielectronic-like recombination process for low temperatures and radio recombination lines of carbon’, The Astrophysical J. 240, 956–961.ADSCrossRefGoogle Scholar

Copyright information

© Kluwer Academic Publishers 1990

Authors and Affiliations

  • A. A. Konovalenkc
    • 1
  1. 1.Institute of Radioastronomy Academy of Sciences of the Ukrainian SSRKharkovUSSR

Personalised recommendations