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.

4 pages

References in corpus (4)

• Exciting Dark Matter and the INTEGRAL/SPI 511 keV signal
• The galactic 511 keV line from electroweak scale WIMPs
• Annihilation Emission from the Galactic Black Hole
• HVS7: a chemically peculiar hyper-velocity star

Cited by in corpus (1)

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