Astrophysics and Space Science

, Volume 166, Issue 1, pp 17–33 | Cite as

Modification of gamma-ray spectrum in a photon field

  • I. P. Ivanenko
  • V. V. Sizov


The changes in the high-energy gamma-ray spectra due to electron-photon cascading in the photon field (e.g., microwave background radiation) are investigated.

The propagation of gamma-rays with an initial power-law spectrum through an isotropic monoenergetic photon field is considered. Two processes of the cascade particle-photon field interaction are taken into account, namely, the photoproduction of electron-positron pairs and the inverse Compton effect. The effect of the synchrotron energy loss by cascade electrons in a magnetic field on the cascade gamma-quantum spectrum is studied. The results may be used to estimate the absorption and the variations in the shape of the spectrum of radiation from compact gamma-ray sources in the metagalaxy.

The cascade characteristics have been obtained by numerically solving the cascade equations by the moment method.


Microwave Energy Loss Background Radiation Moment Method Field Interaction 
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Copyright information

© Kluwer Academic Publishers 1990

Authors and Affiliations

  • I. P. Ivanenko
    • 1
  • V. V. Sizov
    • 1
  1. 1.Institute of Nuclear PhysicsMoscow State UniversityMoscowU.S.S.R.

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