# Searching for Dark Matter in the Galactic Halo with a Wide Field of View TeV Gamma-ray Observatory in the Southern Hemisphere

## TL;DR

This paper estimates the sensitivity of a future wide field-of-view gamma-ray observatory in the Southern Hemisphere to detect dark matter particles in the Galactic halo, covering a broad mass range from hundreds of GeV to PeV energies.

## Contribution

It provides the first sensitivity estimates for a proposed gamma-ray observatory to detect dark matter in the Galactic halo across a wide energy spectrum, highlighting its potential to probe key dark matter parameters.

## Key findings

- Potential to detect gamma rays from dark matter annihilation or decay.
- Sensitivity to the thermal relic annihilation cross section for a wide mass range.
- Coverage of both the Galactic Center and halo with unprecedented sensitivity.

## Abstract

Despite mounting evidence that dark matter (DM) exists in the Universe, its fundamental nature remains unknown. We present sensitivity estimates to detect DM particles with a future very-high-energy ($\gtrsim$ TeV) wide field-of-view gamma-ray observatory in the Southern Hemisphere. This observatory would search for gamma rays from the annihilation or decay of DM particles in the Galactic halo. With a wide field of view, both the Galactic Center and a large fraction of the Galactic halo will be detectable with unprecedented sensitivity to DM in the mass range of $\sim$500 GeV to $\sim$2 PeV. These results, combined with those from other present and future gamma-ray observatories, will likely probe the thermal relic annihilation cross section of Weakly Interacting Massive Particles for all masses from $\sim$80 TeV down to the GeV range in most annihilation channels.