Molecular megamasers after ten years

  • Willem A. Baan
4. Extragalactic Masers
Part of the Lecture Notes in Physics book series (LNP, volume 412)


Megamaser activity for the molecules OH, CH, H2CO, and H2O is reviewed in terms of a consistent picture of exponential amplification of radio continuum by foreground molecular gas. The different characteristics of the various types of megamasers can all be related to the density and pumping conditions of the molecular gas. These conditions strongly depend on the evolutionary stage of the nuclear activity.


Optical Depth Nuclear Region Nuclear Activity Radio Continuum Exponential Amplification 
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. Baan, W.A. 1985, Nature, 315,26.Google Scholar
  2. Baan, W.A. 1988, Ap.J., 330, 743.Google Scholar
  3. Baan, W. A. 1989, Ap. J., 338, 804.Google Scholar
  4. Baan, W.A. 1991. in Skylines, the ThIrd Haystack Conf., P.A.S.P. Conf. Proc., eds. A.D. Haschick, P.T. Ho, p. 45.Google Scholar
  5. Baan, W.A., Freund, R., Haschick, A.D. 1992, in preparation.Google Scholar
  6. Baan, W.A., Glisten, R., Haschick, A.D. 1986, Ap.J., 305, 830.Google Scholar
  7. Baan, W.A., Haschick, A.D. 1992, Ap.J., submitted.Google Scholar
  8. Baan, W.A., Haschick, A.D., Uglesich, R. 1992, in preparation.Google Scholar
  9. Baan, W.A., Salzer, J. 1992, in preparation.Google Scholar
  10. Baan, W.A., et al. 1992, Ap.J. (Letters), in the press.Google Scholar
  11. Barthel, P.D. 1989, Ap.J., 336, 606.Google Scholar
  12. Bottinelli, L. et al. 1991a, in Dynamics of Galaxies and their Cloud Distributions, IAU Symp. 146, eds. F. Combes and F. Casoli, (Kluwer: Dordrecht), p. 201.Google Scholar
  13. Bottinelli, L. et al. 1991a, in Dynamics of Galaxies and their Cloud Distributions, IAU Symp. 146, eds. F. Combes and F. Casoli, (Kluwer: Dordrecht), p. 442.Google Scholar
  14. Brown, R.L., vandenBout, P.A. 1991, Astron. J., 102, 1956.Google Scholar
  15. Burdyuzha, V.V., Komberg, B.V. 1990, Astron. Ap., 234, 40.Google Scholar
  16. Burdyuzha, V.V., Vikulov, K.A. 1990, M.N.R.A.S., 244, 86.Google Scholar
  17. de Zotti, G., Gaskell, C.M. 1985 Astron. Ap., 147, 1Google Scholar
  18. Deguchi, S. 1992, these proceedings.Google Scholar
  19. Elitzur, M., Baan, W.A., Lockett, P. 1991, unpublished.Google Scholar
  20. Elitzur, M., Hollenbach, D., McKee, C. 1989, Ap.J., 367, 333.Google Scholar
  21. Greenhill, L., et al. 1990, Ap.J., 364, 513.Google Scholar
  22. Greenhill, L., et al. 1992, Ap.J., submitted.Google Scholar
  23. Haschick, A.D., Baan, W.A. 1990, ApJ (Letters), 355, L23.Google Scholar
  24. Haschick, A.D., et al. 1990, Ap.J., 356, 149.Google Scholar
  25. Henkel, C., Baan, W.A., Mauersberger, R. 1991, Astron. Ap. Rev., 3, 47.Google Scholar
  26. Henkel, C., Wilson, T. 1991, Astron. Ap., 229, 431.Google Scholar
  27. Martin, J.-M. et al. 1989 C.R. Acad. Sci. Paris, 308(II), 287.Google Scholar
  28. Meadows, V.I., et al. 1990, Proc. ASA, 8 (3), 246.Google Scholar
  29. Norris, R.P., et al. 1990, Ap.J., 359, 291.Google Scholar
  30. Sanders, D.B., et al. 1988, Ap.J., 325, 74.Google Scholar
  31. Sanders, D.B., Scoville, N.Z., Soifer, B.T. 1991, Ap.J., 370, 158.Google Scholar
  32. Scoville, N.Z., et al. 1991, Ap.J. (Letters), 366, L5.Google Scholar
  33. Solomon, P., Downes, D., Radford, D. 1992, Ap.J. (Letters), 387, L55Google Scholar
  34. Whiteoak, J., Gardner, F.F., Höglund, B. 1980, M.N.R.A.S., 190, 17p.Google Scholar
  35. Young, J.S., Scoville, N.Z. 1991, Ann. Rev. Astron. Astroph., 29, 581.Google Scholar

Copyright information

© Springer-Verlag 1993

Authors and Affiliations

  • Willem A. Baan
    • 1
  1. 1.Arecibo ObservatoryArecibo

Personalised recommendations