Astrophysics and Space Science

, Volume 14, Issue 2, pp 286–300 | Cite as

Radio emission of galactic clusters at 1.4 GHz and 2.7 GHz

  • R. Schwartz
Article

Abstract

41 galactic clusters containing stars with spectral types from O5 to B9 have been observed at frequencies of 1.4 GHz and 2.7 GHz. Only clusters with spectral types earlier than B1 show thermal radio emission. Emission measure, mean electron density, and mass ofHii gas have been computed from the observed data, and a comparison between the radio flux and Hα- and Hβ-flux densities has been made. The ratio of hydrogen mass and total stellar mass of the clusters and the gas to dust ratio are given.

Keywords

Hydrogen Dust Radio Emission Emission Measure Spectral Type 

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References

  1. Altenhoff, W., Mezger, P. G., Strassl, H., Wendker, H., and Westerhout, G.: 1960,Veröff. Univ.-Sternwarte Bonn, No.29.Google Scholar
  2. Altenhoff, W. J., Downes, D., Goad, L., Maxwell, A., and Rinehart, R.: 1970,Astron. Astrophys. Suppl. 1, 281.Google Scholar
  3. Alter, G., Ruprecht, J., and Vanysek, V.: 1970,Catalogue of Star Clusters and Associations (ed. by G. Alter, B. Balazs and J. Ruprecht), Akademiai Kiado, Budapest.Google Scholar
  4. Becker, W.: 1963,Z. Astrophys. 57, 117.Google Scholar
  5. Bolton, J. G.: 1960, Obs. of Owens Valley Radio Obs., Cal. I. Techn. No. 5.Google Scholar
  6. Burgess, A.: 1958,Monthly Notices Roy. Astron. Soc. 118, 477.Google Scholar
  7. Conway, R. G., Kellermann, K. I., and Long, R. J.: 1963,Monthly Notices Roy. Astron. Soc. 125, 261.Google Scholar
  8. Davies, R. D. and Tovmassian, H. M.: 1963,Monthly Notices Roy. Astron. Soc. 127, 61.Google Scholar
  9. Drake, F. D.: 1958,Astron. J. 63, 49.Google Scholar
  10. Faulkner, D. J. and Aller, L. H.: 1965,Monthly Notices Roy. Astron. Soc. 130, 121.Google Scholar
  11. Felli, M. and Churchwell, E.: 1970,Astrophys. J. 160, 43.Google Scholar
  12. Foukal, R.: 1969,Astron. Space Sci.,5, 469.Google Scholar
  13. Gebel, W. L.: 1968,Astrophys. J. 153, 743.Google Scholar
  14. Georgelin, Y. P. and Georgelin, Y. M.: 1970,Astron. Astrophys. 6, 349.Google Scholar
  15. Gordon, C. P., Howard III, W. E., and Westerhout, G.: 1968,Astrophys. J. 154, 103.Google Scholar
  16. Haddock, F. T., Mayer, C. H., and Sloanaker, R. M.: 1954,Nature 174, 176.Google Scholar
  17. Helfer, H. L. and Tatel, H. E.: 1959,Astrophys. J. 129, 565.Google Scholar
  18. Hoag, A. A., Johnson, H. L., Iriarte, B., Mitchell, R. I., Hallam, K. L., and Sharpless, S.: 1961,Publ. Naval Obs. 17, 7.Google Scholar
  19. Johnson, H. L.: 1968,Interstellar Extinction: Stars and Stellar Systems, Vol. VII (ed. by B. M. Middlehurst and L. H. Aller), Univ. of Chicago Press, p. 157.Google Scholar
  20. Johnson, H. L., Hoag, A. A., Iriarte, B., Mitchell, R. I., and Hallam, K. L.: 1961, Lowell Obs. Bull. Vol.5, 133.Google Scholar
  21. Kaler, J. B.: 1966,Astrophys. J. 143, 722.Google Scholar
  22. Kellermann, K. I.: 1964,Astron. J. 69, 205.Google Scholar
  23. Kuzmin, A. D., Levchenko, M. T., Noskova, R. I., and Salomonovich, A. E.: 1960,Astron. J. Sov. Union 37, 975.Google Scholar
  24. Lambrecht, H. and Schmidt, K. H.: 1958,Astron. Nachr. 284, 71.Google Scholar
  25. Large, M. I., Mathewson, D. S., and Haslam, C. G. T.: 1961,Monthly Notices Roy. Astron. Soc. 123, 113.Google Scholar
  26. Louise, R. and Monnet, G.: 1969,Astron. Astrophys. 1, 153.Google Scholar
  27. Menon, T. K.: 1956,Astron. J. 61, 9.Google Scholar
  28. Menon, T. K.: 1962,Astrophys. J. 135, 394.Google Scholar
  29. Mezger, P. G.: 1968,Interstellar Ionized Hydrogen (ed. by Y. Terzian), W. A. Benjamin Inc. New York, p. 477.Google Scholar
  30. Mezger, P. G. and Henderson, A. P.: 1967,Astrophys. J. 147, 471.Google Scholar
  31. Miller, J. S.: 1968,Astrophys. J. 151, 473.Google Scholar
  32. Moffat, A. F. J.: 1970, Dissertation, University Bochum.Google Scholar
  33. Moffat, A. J. J.: 1971,Astron. Astrophys. 13, 30.Google Scholar
  34. Oster, L.: 1959,Z. Astrophys. 47, 169.Google Scholar
  35. Pengelly, R. M.: 1964,Monthly Notices Roy. Astron. Soc. 127, 145.Google Scholar
  36. Pottasch, S. R.: 1958,Bull. Astron. Inst. Neth. 14, 482.Google Scholar
  37. RayahavaRao, R., Hedd, W. J., Higg, L. H., and Broton, W. W.: 1965,Monthly Notices Roy. Astron. Soc. 129, 159.Google Scholar
  38. Reifenstein, III, E. C., Wilson, T. L., Burke, B. F., Mezger, P. G., and Altenhoff, W.: 1970,Astron. Astrophys. 4, 357.Google Scholar
  39. Riegel, K. W.: 1967,Astrophys. J. 148, 87.Google Scholar
  40. Schmidt, K. H.: 1963,Astron. Nachr. 287, 41.Google Scholar
  41. Schmidt-Kaler, Th. and Schwartz, R.: 1967,IAU Symp. 31, 41.Google Scholar
  42. Schraml, J. and Mezger, P. G.: 1969,Astrophys. J. 156, 269.Google Scholar
  43. Schwartz, R.: 1967, Forschungsberichte d. Landes Nordrhein-Westfalen, No. 1844.Google Scholar
  44. Schwartz, R.: 1971,Forsch. Astron. Inst. Bonn, No. 71-09.Google Scholar
  45. Sharpless, S.: 1959,Astrophys. J. Suppl. 4, 257.Google Scholar
  46. Terzian, Y.: 1965,Astrophys. J. 142, 135.Google Scholar
  47. Tovmassian, H. M.: 1970,IAU Symp. 38, 173.Google Scholar
  48. Westerhout, G.: 1958,Bull. Astron. Inst. Neth. 14, 215.Google Scholar
  49. Wilson, R. W.: 1963, Obs. of Owens Valley Radio Obs., Cal. I. Tech., No. 2.Google Scholar

Copyright information

© D. Reidel Publishing Company 1971

Authors and Affiliations

  • R. Schwartz
    • 1
  1. 1.Max-Planck-Institut für RadioastronomieBonnGFR

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