Astrophysics and Space Science

, Volume 82, Issue 1, pp 199–207 | Cite as

Seyfert galaxies and the cosmic γ-ray diffuse background

  • L. Bassani
  • R. C. Butler
  • A. J. Dean
  • G. Di Cocco
  • F. Perotti
  • G. Villa
Article

Abstract

Three active galaxies, generally classified as Seyferts, have been discovered recently to be powerful, low energy γ-ray sources. The similarity between their spectral characteristics and those of the cosmic background at γ-ray energies suggests that these objects could make a significant contribution to this diffuse flux. This contribution has been assessed using two different number densities of γ-ray-emitting Seyfert galaxies based on optical and X-ray data. The comparison of the estimated and measured diffuse γ-ray background intensities is used to gain a deeper understanding of the metabolism of Seyfert galaxies.

Keywords

Spectral Characteristic Significant Contribution Deep Understanding Diffuse Flux Background Intensity 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. Adams, T. F.: 1977,Astrophys. J., Suppl. 33, 19.Google Scholar
  2. Bignami, G. F., Lichti, G. G., and Paul, J. A.: 1978.Astron. Astrophys. 68, L15.Google Scholar
  3. Bignami, G. F., Fichtel, C. E., Hartman, R. C., and Thompson, D. J.: 1979,Astrophys. J. 232, 649.Google Scholar
  4. Carter, J. N., Charalambons, P., Dean, A. J. Stephen, J. B., Butler, R. C., Di Cocco, G., Morelli, E., Spade, G., Spizzichino, A., Barbareschi, L., Boella, G., Peroth, F., Villa, G., Badiali, M., La Padula, C., Polcaro, F., and Ubertini, P.: 1981, submitted toNucl. Instr. Meths. Google Scholar
  5. Elvis, M., Maccararo, T., Wilson, A. S., Ward, M. J., Penston, M. V., Fosbury, R. A. E. and Perola, G. C.: 1978,Monthly Notices Roy. Astron. Soc. 183, 129.Google Scholar
  6. Fabian, A. C., Zarnecki, J. C., Culhane, J. L., Hawkins, F. J., Peacock, A., Pounds, K. A. and Parkinson, J. H.: 1974,Astrophys. J. 189, L59.Google Scholar
  7. Fichtel, C. E., Simpson, G. A. and Thompson, D. J. 1978,Astrophys. J. 222, 833.Google Scholar
  8. Geller, M. J., Turner, E. L., and Bruno, M. S.: 1979.Astrophys. J. 230, L141.Google Scholar
  9. Kraushaar, W. L., Clark, G. W., Garmire, G. P., Borken, R., Higbie, P., Leong, V., and Thorsos, T.: 1972,Astrophys. J. 177, 341.Google Scholar
  10. Lawrence, A.: 1980,Monthly Notices Roy. Astron. Soc. 193, 83.Google Scholar
  11. Leiter, D.: 1980,Astron. Astrophys. 89, 370.Google Scholar
  12. Lichti, G. G., Bignami, G. F., and Paul, J. A.: 1978,Astrophys. Space. Sci. 56, 403.Google Scholar
  13. Mandrou, P., Vedrenne, G., and Niel, M.: 1979,Astrophys. J. 230, 97.Google Scholar
  14. Metzger, A. E., Anderson, E. C., Van Dilla, M. A., and Arnold, J. R.: 1964,Nature 204, 766.Google Scholar
  15. Miller, H. R.: 1979,Astrophys. J. 227, 52.Google Scholar
  16. Mushotzky, R. F., Marshall, F. E., Boldt, E. A., Holt, S. S., and Serlemitsos, P. J.: 1980,Astrophys. J. 235, 377.Google Scholar
  17. Mushotzky, R. F., and Marshall, F. E.: 1980,Astrophys. J. 239, L5.Google Scholar
  18. Osterbrock, D. E. and Koski, A. T. 1976,Monthly Notices Roy. Astron. Soc. 176, 61P.Google Scholar
  19. Perotti, F., Della Ventura, A., Sechi, G., Villa, G., Di Cocco, G., Baker, R. E., Butler, R. C., Dean, A. J., and Hayles, R. I.: 1979,Nature 282, 484.Google Scholar
  20. Perotti, F., Della Ventura, A., Villa, G., Di Cocco, G., Bassani, L., Butler, R. C., Carter, J. N., and Dean, A. J.: 1981a,Astrophys. J. 247, L63.Google Scholar
  21. Perotti, F., Della Ventura, A., Villa, G., Di Cocco, G., Butler, R. C., Carter, J. N., and Dean, A. J. 1981b,Nature 292, 133.Google Scholar
  22. Primini, F. A., Basinska, E., Howe, S. K. Lang, F., Levine, A. M., Lewin, W. H. G., Rothschild, R., Baity, W. A., Gruber, D. E., Knight, F. K., Matteson, J. L., Lea, S. M., and Reichert, G. A.: 1981,Astrophys. J. 243, L13.Google Scholar
  23. Rothschild, R. E., Baity, W. A., Marscher, A. P., and Wheaton, W. A.: 1981,Astrophys. J. 243, L9.Google Scholar
  24. Schonfelder, V., Graml, F., and Penningsfeld, F. P.: 1980,Astrophys. J. 240, 350.Google Scholar
  25. Schonfelder, V.: 1977,Nature 274, 344.Google Scholar
  26. Schonfelder, V., Graser, U., and Daugherty, J.: 1977,Astrophys. 217, 306.Google Scholar
  27. Schonfelder, V., Swanenburg, B. N. Lockwood, J. A., Taylor, B. G., Kanbach, G., Melzner, F., Bleeker, J. A. M., Deerenberg, A. J. M., Hermsen, W., Webber, W. R., Bennett, K., and Wills, R. D.: 1978, Proposal for a GRO Experiment.Google Scholar
  28. Schwartz, D. A.: 1980,Phys. Scripta 21, 644.Google Scholar
  29. Seyfert, C. K.: 1943,Astrophys. J. 97, 28.Google Scholar
  30. Share, G. H., Kinzer, R. L., and Seeman, N.: 1974,Astrophys. J. 187, 511.Google Scholar
  31. Silk, J.: 1970,Space Sci. Rev. 11, 671.Google Scholar
  32. Strong, A. W., Wolfendale, A. W., and Worrall, D. M.: 1976.Monthly Notices Roy. Astron. Soc. 175, 23P.Google Scholar
  33. Tananbaum, H., Peters, G., Forman, W., Giacconi, R., and Jones, C.: 1978,Astrophys. J. 223, 74.Google Scholar
  34. Thakur, R. K., and Sapre, A. K.: 1980,Astrophys. Space. Sci. 70, 281.Google Scholar
  35. Trombka, J. I., Dyer, G. S., Evans, L. G., Bielefeld, M. J., Seltzer, S. M., and Metzger, A. E.: 1977,Astrophys. J. 212 925.Google Scholar
  36. Vedrenne, G., Alberne, F., Martin, A., and Talon, R.: 1971,Astron. Astrophys. 15, 50.Google Scholar
  37. Veron, P.: 1978,Nature,272, 430.Google Scholar
  38. Veron, P.: 1979,Astron. Astrophys. 78, 46.Google Scholar
  39. Vette, J. I., Gruber, D., Matteson, J. L., and Peterson, L. E.: 1970,Astrophys. J. 160, L161.Google Scholar
  40. Ward, M. J., Wilson, A. S., Disney, M. J., Elvis, M., and Maccacraro, T.: 1977,Astron. Astrophys. 59, 119.Google Scholar
  41. Weedman, D. W.: 1977,Ann. Rev. Astron. Astrophys. 15, 69.Google Scholar
  42. White, R. S., Dayton, B., Moon, S. H., Ryan, J. M., Wilson, R. B., and Zych, A. D.: 1977,Astrophys. J. 218, 920.Google Scholar
  43. Wilson, A. S. and Willis, A. G.: 1980,Astrophys. J. 240, 429.Google Scholar

Copyright information

© D. Reidel Publishing Co 1982

Authors and Affiliations

  • L. Bassani
    • 1
  • R. C. Butler
    • 1
  • A. J. Dean
    • 1
  • G. Di Cocco
    • 2
  • F. Perotti
    • 3
  • G. Villa
    • 3
  1. 1.Physics DepartmentUniversity of SouthamptonSouthamptonU.K.
  2. 2.Istituto TESREBolognaItaly
  3. 3.Istituto Fisica CosmicaMilanoItaly

Personalised recommendations