Cosmic Abundance of Iron

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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.

About the authors

N. N. Chugai

Institute of Astronomy, Russian Academy of Sciences

Author for correspondence.
Email: nchugai@inasan.ru
119017, Moscow, Russia

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