Abstract
I explore the possibility of estimating an upper limit for the present-day iron abundance in the baryonic matter at which the gamma-ray background from the decay of \({}^{56}\)Ni synthesized in the Universe to date comes into conflict with the observed MeV gamma-ray background. I calculate the brightness of the gamma-ray background from SNe Ia and SNe II by taking into account the gamma-ray scattering and absorption in supernova ejecta. The model brightness of the gamma-ray background is shown to be consistent with the observed MeV gamma-ray background if the iron abundance in the baryonic matter is less than 15\({\%}\) of the solar one.
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Chugai, N.N. Cosmic Abundance of Iron. Astron. Lett. 49, 209–215 (2023). https://doi.org/10.1134/S1063773723050018
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DOI: https://doi.org/10.1134/S1063773723050018