Dark Matter Identification using Gamma Rays from Dwarf Galaxies
Abstract
If the positron fraction and combined electron-positron flux excesses recently observed by PAMELA, Fermi and HESS have a dark matter origin, final state radiation (FSR) photons from dark matter annihilation into lepton-rich final states may be detected with observations of satellite dwarf galaxies of the Milky Way by ground-based atmospheric Cherenkov telescopes (ACTs). We find that current and near-future ACTs have excellent potential for such detection, although a discovery cannot be guaranteed due to large uncertainties in the distribution of dark matter within the dwarfs. We find that models predicting dark matter annihilation into two-lepton final states and those favoring four-lepton final states (as in, for example, "axion portal" models) can be reliably distinguished using the FSR photon spectrum once measured, and the dark matter particle mass can also be accurately determined.
Cite
@article{arxiv.1012.4024,
title = {Dark Matter Identification using Gamma Rays from Dwarf Galaxies},
author = {Bibhushan Shakya and Maxim Perelstein},
journal= {arXiv preprint arXiv:1012.4024},
year = {2010}
}
Comments
7 pages, 2 figures. Contribution to the proceedings of the 8th International Workshop on Identification of Dark Matter (IDM 2010), July 26-30, 2010, Montpellier, France. Contains some updated results not in the original paper