Abstract
The detection of an extragalactic component of celestial γ-radiation1,2 has stimulated the question of the possible contributions from external point sources, especially since the detection of γ rays from NGC4151 (ref. 3) and from 3C273 (ref. 4). Here we discuss the role of the inverse Compton effect (ICE) of relativistic electrons on universal microwave photons for the production of high energy γ rays from normal spiral galaxies.
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Niemann, W., Thielheim, K. Universal microwave radiation and extragalactic γ radiation. Nature 282, 48–50 (1979). https://doi.org/10.1038/282048a0
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DOI: https://doi.org/10.1038/282048a0
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