# A new target object for constraining annihilating dark matter

## TL;DR

This paper proposes NGC 2976 as a new target for constraining annihilating dark matter, providing tight bounds on dark matter mass for leptophilic channels using radio and x-ray data.

## Contribution

It introduces NGC 2976 as a novel observational target for dark matter constraints, especially in leptophilic channels, expanding beyond traditional dwarf galaxies.

## Key findings

- Lower limits of dark matter mass: 200 GeV for e+e-, 130 GeV for μ+μ-, 110 GeV for τ+τ- channels.
- NGC 2976's radio and x-ray data yield strong constraints on dark matter annihilation.
- Large nearby dwarf galaxies with high magnetic fields are promising for future dark matter studies.

## Abstract

In the past decade, gamma-ray observations and radio observations of our Milky Way and the Milky Way dwarf spheroidal satellite galaxies put very strong constraints on annihilation cross sections of dark matter. In this article, we suggest a new target object (NGC 2976) that can be used for constraining annihilating dark matter. The radio and x-ray data of NGC 2976 can put very tight constraints on the leptophilic channels of dark matter annihilation. The lower limits of dark matter mass annihilating via $e^+e^-$, $\mu^+\mu^-$ and $\tau^+\tau^-$ channels are 200 GeV, 130 GeV and 110 GeV respectively with the canonical thermal relic cross section. We suggest that this kind of large nearby dwarf galaxies with relatively high magnetic field can be good candidates for constraining annihilating dark matter in future analysis.