The contribution of normal galaxies to the low energy gamma-ray cosmic diffuse background

Astronomy and Astrophysics – Astronomy

Scientific paper

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Background Radiation, Diffuse Radiation, Galactic Cosmic Rays, Galactic Nuclei, Gamma Ray Astronomy, Active Galactic Nuclei, Emission Spectra, Particle Energy, Particle Interactions

Scientific paper

Theories to explain the origin of the cosmic diffuse γ-ray background generally fall into one of two broad categories: those which attribute the emission to particle interactions in intergalactic space and those which attribute it to the summation of numerous, unresolved discrete sources, including normal field galaxies, active galactic nuclei and clusters of galaxies. Strong support for the latter interpretation is given by recent measurements of γ-ray emission from external galaxies, mainly Seyfert galaxies. Their summed contribution has been evaluated elsewhere: here, instead, the authors use recent observational data on the γ-ray emission from our own galaxy to estimate the contribution of normal galaxies to the cosmic diffuse γ-radiation. The result indicates that this contribution is limited to less than 0.1% and can therefore be neglected.

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