Energy spectrum of extragalactic gamma-ray sources

Details Energy spectrum of extragalactic gamma-ray sources Energy spectrum of extragalactic gamma-ray sources

Aug 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985icrc....1..297p&link_type=abstract

In NASA. Goddard Space Flight Center 19th Intern. Cosmic Ray Conf., Vol. 1 p 297-300 (SEE N85-33902 22-93)

Computer Science

Electron Photon Cascades, Energy Spectra, Extragalactic Radio Sources, Gamma Rays, Monte Carlo Method, Radiant Flux Density, Background Radiation, Computerized Simulation, Cosmic Ray Showers, High Energy Interactions, Interstellar Magnetic Fields, Magellanic Clouds, Microwaves, Pair Production

Scientific paper

The result of Monte Carlo electron photon cascade calculations for propagation of gamma rays through regions of extragalactic space containing no magnetic field are given. These calculations then provide upper limits to the expected flux from extragalactic sources. Since gamma rays in the 10 to the 14th power eV to 10 to the 17th power eV energy range are of interest, interactions of electrons and photons with the 3 K microwave background radiation are considered. To obtain an upper limit to the expected gamma ray flux from sources, the intergalactic field is assumed to be so low that it can be ignored. Interactions with photons of the near-infrared background radiation are not considered here although these will have important implications for gamma rays below 10 to the 14th power eV if the near infrared background radiation is universal. Interaction lengths of electrons and photons in the microwave background radiation at a temperature of 2.96 K were calculated and are given.

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