Comment on "Constraining the annihilating dark matter mass by the radio continuum spectral data of NGC4214 galaxy"

TL;DR

This paper critiques a recent study claiming radio data from NGC4214 can constrain dark matter annihilation, arguing the data can be explained without dark matter contributions, thus challenging the original limits.

Contribution

The authors provide a critical analysis showing that previous upper limits on dark matter annihilation cross section are significantly underestimated due to misinterpretation of radio data.

Findings

Radio emission explained without dark matter contribution

Previous upper limits underestimated by at least a factor of 100

Standard spectral models suffice to explain observations

Abstract

In their recent paper, Chan and Lee discuss an interesting possibility: radio continuum emission from a dwarf irregular galaxy may be used to constrain upper limits on the cross section of annihilating dark matter. They claim that the contributions from nonthermal and thermal emission can be estimated with such accuracy that one can place new upper limits on the annihilation cross section. We argue that the observations presented can be explained entirely with a standard spectrum and no contribution from dark matter. As a result, the estimated upper limits of Chan and Lee are atleast by a factor of 100 too low.