Constraining annihilating dark matter mass by the radio continuum spectral data of a high-redshift galaxy cluster

TL;DR

This study uses radio continuum spectral data from a high-redshift galaxy cluster to place constraints on the mass of annihilating dark matter, focusing on leptophilic channels.

Contribution

It introduces the use of high-redshift galaxy cluster radio data to constrain dark matter properties, expanding beyond local galaxy studies.

Findings

Leptophilic annihilation channels fit the radio spectrum well.

Radio data can effectively constrain dark matter mass.

High-redshift clusters are valuable for dark matter studies.

Abstract

In the past decade, the properties of annihilating dark matter models were examined by various kinds of data, including the data of gamma rays, radio waves, X-ray, positrons, electrons, antiprotons and neutrinos. In particular, most of the studies focus on the data of our Galaxy, nearby galaxies (e.g. M31 galaxy) or nearby galaxy clusters (e.g. Fornax cluster). In this article, we examine the archival radio continuum spectral data of a relatively high-redshift galaxy cluster (A697 cluster) to constrain the properties of annihilating dark matter. We find that leptophilic annihilation channels ($e^+e^-$, $\mu^+\mu^-$ and $\tau^+\tau^-$) can give very good fits to the radio continuum spectrum of the A697 cluster.