Origin of MeV-excess in the energy spectrum of diffuse cosmic gamma rays

Details Origin of MeV-excess in the energy spectrum of diffuse cosmic gamma rays Origin of MeV-excess in the energy spectrum of diffuse cosmic gamma rays

Jul 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978natur.274..344s&link_type=abstract

Nature, vol. 274, July 27, 1978, p. 344-346.

Astronomy and Astrophysics

Astronomy

47

Astronomical Spectroscopy, Cosmic Rays, Energy Spectra, Galactic Radiation, Gamma Ray Astronomy, Seyfert Galaxies, Compton Effect, Diffuse Radiation, Graphs (Charts), Luminosity, Superposition (Mathematics), X Ray Sources

Scientific paper

Diffuse cosmic gamma radiation is either interpreted as the result of interaction in intergalactic space or as the result of the superposition of many unresolved external galaxies. A description is presented of measurements of the energy spectrum of the Seyfert galaxy NGC 4151 which strongly support the hypothesis that the diffuse cosmic gamma radiation results from the superimposition of many unresolved galaxies of the same type as NGC 4151. The energy spectrum of NGC 4151 plotted between 2 and 10 MeV is shown in a graph. The measurements conducted with the Compton telescope are in good agreement with a power law extrapolation from X-ray energies up to about 3 MeV. Above this energy the spectrum is considerably steeper.

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