Positron excess in the center of the Milky Way from short-lived ${\beta }^{+}$ emitting isotopes

Abstract

Observations of the INTEGRAL satellite revealed the presence of yet unexplained excess in the central region of the Galaxy at the energies around 511 keV. These gamma-rays are produced in the process of positron annihilation, the needed rate is around $10^{42}{\mathrm{s}}^{-1}$. In this short paper it is shown that \pos -emitting isotopes that are formed in interactions of subrelativistic cosmic rays (CRs) with light nuclei (CNONe) can account for a considerable fraction -- up to several tens of percent -- of $e^{+}$ production rate in the central region.

arXiv comment4 pages

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Cited by in corpus (1)

• Can flaring stars explain the annihilation line from the Galaxy bulge?