Radio Recombination Lines in Extragalactic Sources

  • M. B. Bell
Part of the Astrophysics and Space Science Library book series (ASSL, volume 80)


Attempts to detect Hydrogen recombination lines from extragalactic sources using narrow 10MHz observing windows began at least as far back as 19T15 when E. Seaquist and I searched for emission lines in 3C273. Other unreported searches with negative results were almost certainly made, but meaningful observations began only in late 1975 when wider observing windows (30-90 MHz) became available. Although many improvements In instrumentation and observing techniques have been made in the last four years mere detection of the wide, weak recombination lines found in external galaxies Is still a struggle. However detections have now been made in at least two sources with sufficient accuracy to enable us to define the line producing mechanism and, with some improvements in instrumentation many more detections may be made soon, in what is turning out to be an exciting new field of astronomy.


Recombination Line Seyfert Galaxy Extragalactic Source Extragalactic Object External Galaxy 
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. Baker, J.R., Haslam, C.G.T., Jones, B.B., and Wielebinski, R., 1977, Astron. Astrophys., 59, 261.ADSGoogle Scholar
  2. Beck, S.C., Lacy, J.H. and Geballe, T.R., 1979, Astron. J., 231, 28.ADSGoogle Scholar
  3. Bell, M.B., and Seaquist, E.R., 1977, Astron. Astrophys., 56, 461.ADSGoogle Scholar
  4. Bell, M.B., and Seaquist, E.R., 1978, Ap. J., 223, 378.ADSCrossRefGoogle Scholar
  5. Chaisson, E.J., and Rodriguez, L.F., 1977, Ap. J., 214, L111.ADSCrossRefGoogle Scholar
  6. Churchwell, E., and Shaver, P.A., 1979, Astron. Astrophys., (in press).Google Scholar
  7. Kojoian, G., Dickinson, D.F., Tovmassian, H.M. and Dinger, A.S., 1978, Astrofizika, 14, No. 3, 455ADSGoogle Scholar
  8. Kronberg, P.P. and Wilkinson, P.N., 1975, Ap. J., 200, 430.ADSCrossRefGoogle Scholar
  9. Mebold, U., Shaver, P.A., Bell, M.B., and Seaquist, E.R., 1979, Astron. Astrophys. (in press).Google Scholar
  10. Osterbrock, D.E., and Cohen, R., 1979, Mon. Not. R. Soc., 187, 61 P.ADSGoogle Scholar
  11. Recillas-Cruz, E., and Peimbert, M., 1970, Bol. Obs. Tonantzintla y Tacubaya, No. 35, p. 247.ADSGoogle Scholar
  12. Sanamyan, V.A., and Kandalyam, R.A., 1978, Astrofizika, 14, No. 4, 687.ADSGoogle Scholar
  13. Seaquist, E.R., and Bell, M.B., 1977, Astron. Astrophys., 60, L1.ADSGoogle Scholar
  14. Shaver, P., Churchwell, E., and Rots, A.H., 1977, Astron. Astrophys.,55, 435.ADSGoogle Scholar
  15. Shaver, P.A., Churchwell, E. and Walmsley, C.M., 1978, Astron. Astrophys., 64, 1.ADSGoogle Scholar
  16. van der Kruit, P.C., 1977, Astron. Astrophys., 59, 359ADSGoogle Scholar
  17. Wills, D., and Wills, B.J., 1976, Ap. J. Suppl. 31, 143.ADSCrossRefGoogle Scholar

Copyright information

© D. Reidel Publishing Company 1980

Authors and Affiliations

  • M. B. Bell
    • 1
  1. 1.Herzberg Institute of AstrophysicsNational Research Council of CanadaOttawaCanada

Personalised recommendations