# Dark matter in the Reticulum II dSph: a radio search

## TL;DR

This study conducted a deep radio search in the Reticulum II dwarf galaxy to detect potential signals from dark matter annihilation, finding no diffuse emission but identifying new radio sources and potential counterparts to gamma-ray signals.

## Contribution

The paper provides the first deep radio observations of Reticulum II with competitive bounds on WIMP properties and identifies candidate sources related to gamma-ray emissions.

## Key findings

- No diffuse synchrotron emission detected from Reticulum II.
- Over 200 new background radio sources identified.
- Two candidate sources may be related to gamma-ray signals.

## Abstract

We present a deep radio search in the Reticulum II dwarf spheroidal (dSph) galaxy performed with the Australia Telescope Compact Array. Observations were conducted at 16 cm wavelength, with an rms sensitivity of 0.01 mJy/beam, and with the goal of searching for synchrotron emission induced by annihilation or decay of weakly interacting massive particles (WIMPs). Data were complemented with observations on large angular scales taken with the KAT-7 telescope. We find no evidence for a diffuse emission from the dSph and we derive competitive bounds on the WIMP properties. In addition, we detect more than 200 new background radio sources. Among them, we show there are two compelling candidates for being the radio counterpart of the possible gamma-ray emission reported by other groups using Fermi-LAT data.