Effect of electron-photon cascading on the observed energy spectra of extragalactic sources of ultra-high-energy gamma-rays

Details Effect of electron-photon cascading on the observed energy spectra of extragalactic sources of ultra-high-energy gamma-rays Effect of electron-photon cascading on the observed energy spectra of extragalactic sources of ultra-high-energy gamma-rays

Aug 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986mnras.221..769p&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 221, Aug. 15, 1986, p. 769-788. Research supported by t

Astronomy and Astrophysics

Astronomy

86

Cosmic Ray Showers, Electron Photon Cascades, Energetic Particles, Energy Spectra, Gamma Ray Astronomy, Electrons, High Energy Interactions, Monte Carlo Method, Pair Production, Photons, X Ray Stars

Scientific paper

Monte Carlo calculations were performed to investigate the source(s) 10 to the 14th to 10 to the 19th eV gamma rays arriving at earth-based detectors from Cygnus X-3, the Large Magellanic Cloud and Centaurus A. The calculations were carried out with observed cross-sections to project the associated photon-photon pair production interactions and the inverse Compton scattering by electrons and photons of the cosmic 3 K background. Ater assuming that the gamma rays were not affected by magnetic fields, an attempt was made to deconvolve the spectra to obtain the spectra of the sources. Only Cen A could be confirmed as a gamma ray source. However, greater refinement of the spectral data is required if any of the radiation observed is to be concluded to have started the journey as gamma rays.

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