X-Rays and Gamma-Rays at Cosmological Distances

  • Andrzej A. Zdziarski
  • Roland Svensson
Part of the NATO ASI Series book series (ASIC, volume 305)


Our recent work on absorption and reprocessing of γ-rays at cosmological redshifts as well as the current status of this field of research axe discussed. We consider Compton scattering and pair production by γ-rays on cosmic baryonic matter, and photon-photon scattering and photon-photon pair production by γ-rays and Compton scattering of relativistic pairs on the cosmic blackbody background. We point out the cosmological importance of photon-photon scattering. The region where the universe is transparent to γ-rays and the regions of dominance of the elementary processes in the photon-energy-redshift plane are determined. The problem of cosmological γ-ray reprocessing is relevant, e.g., for observational γ-ray astronomy, for which the signatures of the cosmological origin of discrete and background sources need to be determined, and for studies of the effects that pair cascades, caused by the decay of unstable particles from a hot Big Bang, have on the primordial nucleosynthesis and on the shape of the cosmic microwave background spectrum.


Pair Production Optical Depth Baryonic Matter Thomson Scattering Cosmological Redshift 
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  1. Aharonian, F. A., Kirillov-Ugryumov, V. G., and Vardanian, V. V. 1985, Astr. Sp. Sci., 115, 201.ADSCrossRefGoogle Scholar
  2. Arons, J. 1971, Ap. J., 164, 437; Ap. J., 164, 457.ADSGoogle Scholar
  3. Arons, J., and McCray, R. 1969, Ap. J. (Letters), 158, L91.ADSCrossRefGoogle Scholar
  4. Audouze, J., Lindley, D., and Silk, J. 1985, Ap. J. (Letters), 293, L53.ADSCrossRefGoogle Scholar
  5. Babul, A., Paczyński, B., and Spergel, D., 1987, Ap. J. (Letters), 316, L49.ADSCrossRefGoogle Scholar
  6. Brown, R. W., Mlkaelian, K. O., and Gould, R. J. 1973, Astr. Lett., 14, 203.ADSGoogle Scholar
  7. Désert, F. X., and Schatzman, E. 1986, Astr. Ap., 158, 135.ADSGoogle Scholar
  8. Dimopoulos, S., Esmailzadeh, R., Hall, J, and Starkman, G. 1988, Ap. J., 330, 545.ADSCrossRefGoogle Scholar
  9. Domínguez-Tenreiro, R. 1987, Ap. J., 313, 523.ADSCrossRefGoogle Scholar
  10. Ellis, J., Nanopoulos, D., and Sarkar, S. 1985, Nucl. Phys. B, 259, 175.ADSCrossRefGoogle Scholar
  11. Fazio, G. G., and Stecker, F. W. 1970, Nature, 226, 136.ADSCrossRefGoogle Scholar
  12. Field, G. B., and Walker, T. P. 1989, preprint.Google Scholar
  13. Fukugita, M., Kawasaki, M., and Yanagida, T. 1989, Ap. J. (Letters), 342, L1.ADSCrossRefGoogle Scholar
  14. Gunn, J. E., and Peterson, B. A. 1965, Ap. J., 142, 1633.ADSCrossRefGoogle Scholar
  15. Jauch, J. M., and Rohrlich, F. 1980, The Theory of Photons and Electrons, ( Berlin: Springer).Google Scholar
  16. Juszkiewicz, R., Silk, J., and Stebbins, A. 1985, Phys. Letters, 158B, 463.ADSGoogle Scholar
  17. Kawasaki, M., and Sato, K. 1987, Phys. Letters, 189B, 23.ADSGoogle Scholar
  18. Lindley, D. 1985, Ap. J., 294, 1.ADSCrossRefGoogle Scholar
  19. Matsumoto, T., Hayakawa, S., Matsuo, H., Murakami, H., Sato, S., Lange, A. E., and Richards, P. L. 1988, Ap. J., 329, 567.ADSCrossRefGoogle Scholar
  20. Montmerle, T. 1975, Ap. J., 197, 285.ADSCrossRefGoogle Scholar
  21. Paczyński B. 1988, Ap. J., 335, 525.ADSCrossRefGoogle Scholar
  22. Protheroe, R. J. 1986, M. N. R. A. S., 221, 769.ADSGoogle Scholar
  23. Rees, M. J. 1969, Ap. Letters, 4, 113.ADSGoogle Scholar
  24. Stecker, F. W. 1969, Ap. J., 157, 507.ADSCrossRefGoogle Scholar
  25. Stecker, F. W. 1971, Cosmic Gamma Rays (Washington: NASA, Scientific and Technical Publication Office).Google Scholar
  26. Stecker, F. W. 1975, in Origin of Cosmic Rays, ed. J. L. Osborne and A. W. Wolfendale ( Dordrecht: Reidel ), p. 267.Google Scholar
  27. Stone, A. D., and Field, G. B. 1988, B. A. A. S., 20, 973.ADSGoogle Scholar
  28. Svensson, R. 1987, M. N. R. A. S., 227, 403.ADSGoogle Scholar
  29. Svensson, R. 1987, M. N. R. A. S., 227, 403.ADSGoogle Scholar
  30. Thompson, C., and Madau, P. 1989, in STScI-GSCF Workshop on Ultra-Hot Plasmas and Electron-Positron Pairs in Astrophysics, ed. A. A. Zdziarski and D. Kazanas ( Baltimore: STScI Publ. ), p. 48.Google Scholar
  31. Vilenkin, A. 1988, Nature, 332, 610.ADSCrossRefGoogle Scholar
  32. Weinberg, S. 1972, Gravitation and Cosmology, ( New York: Wiley).Google Scholar
  33. Zbyszewska, M., and Zdziarski, A. A. 1990, in preparation.Google Scholar
  34. Zdziarski, A. A. 1988, Ap. J., 335, 786; 342, 1212.Google Scholar
  35. Zdziarski, A. A., Paczyński, B., and Svensson R. 1990, in preparation.Google Scholar
  36. Zdziarski, A. A., and Svensson R. 1989, Ap. J., 344, 551 (ZS89).ADSCrossRefGoogle Scholar

Copyright information

© Kluwer Academic Publishers 1990

Authors and Affiliations

  • Andrzej A. Zdziarski
    • 1
  • Roland Svensson
    • 2
  1. 1.Space Telescope Science InstituteBaltimoreUSA
  2. 2.NORDITACopenhagen ØDenmark

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