# Bounds on WIMP dark matter from galaxy clusters at low redshift

## TL;DR

This paper uses galaxy cluster and gamma-ray data to set new limits on dark matter properties, excluding certain models below 20 GeV mass with no detected signal.

## Contribution

It introduces a novel cross-correlation analysis between gamma-ray maps and galaxy cluster catalogues to constrain dark matter properties at low redshift.

## Key findings

- No evidence of dark matter signal detected.
- Constraints exclude thermal cross-section for DM below 20 GeV.
- Analysis across multiple wavebands enhances sensitivity.

## Abstract

The study of the cross-correlation angular power spectrum between gravitational tracers and electromagnetic signals can be a powerful tool to constrain Dark Matter (DM) microscopic properties. In this work we correlate \Fermi\ diffuse \g-ray maps with catalogues of galaxy clusters. To emphasize the sensitivity to a DM signal, we select clusters at low-redshift $0<z<0.2$ and with large-halo mass $M_{500}>10^{13}M_\odot$. The analysis is performed with four catalogues in different wavebands, including infrared, optical and X-rays. No evidence for a DM signal is identified. On the other hand, we derive competitive bounds: the thermal cross-section is excluded at 95\% C.L. for DM masses below 20 GeV and annihilation in the $\tau^+-\tau^-$ channel.