Constraining annihilating dark matter by radio data of M33

TL;DR

This study uses radio data from the galaxy M33 to set new, more stringent limits on dark matter annihilation cross sections, challenging some recent findings from gamma-ray and cosmic-ray observations.

Contribution

First analysis of M33 radio data to constrain annihilating dark matter, providing more stringent limits than previous gamma-ray observations from the Milky Way satellites.

Findings

Constraints on dark matter mass for e+e-, μ+μ-, τ+τ- channels are 190, 120, 70 GeV.

Results are in tension with recent AMS-02 and Fermi-LAT analyses.

Radio data offers a new avenue for dark matter indirect detection.

Abstract

Recent studies of radio data put strong constraints on annihilation cross section for dark matter. In this article, we provide the first analysis of using M33 radio data in constraining annihilating dark matter. The resulting constraints of annihilation cross sections for some channels are more stringent than that obtained from 6 years of Fermi Large Area Telescope (Fermi-LAT) gamma-ray observations of the Milky Way dwarf spheroidal satellite galaxies. In particular, the conservative lower limits of dark matter mass annihilating via $e^+e^-$, $\mu^+\mu^-$and $\tau^+\tau^-$ channels are 190 GeV, 120 GeV and 70 GeV respectively with the thermal relic annihilation cross section. These results are in large tensions with some of the recent quantitative analyses of the AMS-02 and Fermi-LAT data of the Milky Way center.