# Constraints on dark matter models from the observation of Triangulum-II with the Fermi Large Area Telescope

## TL;DR

This study analyzes nearly seven years of Fermi-LAT data on Triangulum-II, a dwarf galaxy, to search for gamma-ray signals from dark matter annihilation, setting limits on WIMP models and their annihilation cross-sections.

## Contribution

It provides new constraints on dark matter WIMP models by analyzing gamma-ray data from Triangulum-II and deriving upper limits on annihilation cross-sections.

## Key findings

- No gamma-ray excess detected from Triangulum-II.
- Derived upper limits on gamma-ray flux for various WIMP models.
- Constrained parameter space of WIMP annihilation cross-sections.

## Abstract

Triangulum-II, a newly discovered dwarf spheroidal galaxy, is a strong candidate for the indirect search of dark matter through the detection of $\gamma$-ray emission that could originate from the pair- annihilation of weakly interacting massive particles (WIMPs). We here report on the analysis of almost seven years Fermi Gamma-Ray Space Telescope data of Triangulum-II which was taken during its all sky survey operation mode. No excess $\gamma$-ray emission has been detected above 100 MeV from Triangulum-II. We derive the upper limits on $\gamma$-ray flux assuming both the power-law spectra and the spectra related to WIMP annihilation. In this work, we have considered several theoretical WIMP (neutralinos here) models envisioning both thermal and non-thermal production of WIMPs, and put limits on pair-annihilation cross-section of WIMPs to constrain the parameter space related to those theoretical models.