Constraints on the parameters of keV-scale mass annihilating Dark Matter obtained with SRG/ART-XC observations

TL;DR

This study uses SRG/ART-XC observations to set new limits on the annihilation cross section of keV-scale dark matter particles, especially from the Milky Way Halo, improving existing constraints in this mass range.

Contribution

It provides the first comprehensive constraints on keV-scale mass annihilating dark matter using full-sky SRG/ART-XC data, focusing on the Milky Way Halo and dwarf galaxies.

Findings

Milky Way Halo constraints are the strongest to date for 4-15 keV dark matter.

Constraints from dwarf spheroidal galaxies complement the halo results.

New limits significantly restrict parameter space for keV-scale dark matter models.

Abstract

In this paper we present new constraints on the velocity-independent cross section of keV-scale mass annihilating Dark Matter particles obtained with SRG/ART-XC after 4 full-sky surveys. These constraints are derived from observations of the Milky Way Halo, 33 Local Group spheroidal dwarf (dSph) galaxies and separately for the dSph galaxy Ursa Major III/UNIONS 1. The constraints from the Milky Way Halo are the strongest among others and among all available in literature for this class of Dark Matter models with particle masses from 4 to 15 keV.