  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.
