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

We apply the recently developed analysis of 16 years of INTEGRAL/SPI data including a dark matter spatial template to derive bounds on dark matter candidates lighter than WIMPs (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 $\sim$60 keV and $\sim$16 MeV experiencing two-body decays producing photon lines.