Constraints on light decaying dark matter candidates from 16 yr of INTEGRAL/SPI observations

We apply the recently developed analysis of 16 yr of INTEGRAL/SPI data including a dark matter spatial template to derive bounds on dark matter candidates lighter than weakly interacting massive particles (like sterile neutrinos or axion-like particles) decaying into line or continuum electromagnetic final state channels. The bounds obtained are the strongest to date for dark matter masses between similar to 60 keV and similar to 16 MeV experiencing two-body decays producing photon lines.

Automated summary

Using the analysis method of INTEGRAL/SPI data and a dark matter spatial template, we investigate the constraints on dark matter candidates lighter than weakly interacting massive particles decaying into line or continuum electromagnetic final state channels. The obtained bounds are the strongest to date for dark matter masses between approximately 60 keV and 16 MeV, experiencing two-body decays producing photon lines.