Abstract
A brief summary is presented of requirements for the measurements of extragalactic γ-ray lines. The electron-positron annihilation line at 511 keV represents the best prospect, and although this line is greatly broadened in active galactic nuclei, a narrow line should be present in clusters of galaxies and radio lobes as a result of prior AGN activity. The strongest fluxes should be of the order of 10−4 photons cm−2 s−1 from the closest extended sources.
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Griffiths, R.E. (2006). Prospects and requirements for measurements of extragalactic γ-ray lines. In: von Ballmoos, P. (eds) Focusing Telescopes in Nuclear Astrophysics. Springer, Dordrecht. https://doi.org/10.1007/978-1-4020-5304-7_3
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DOI: https://doi.org/10.1007/978-1-4020-5304-7_3
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