Dark matter line search using a joint analysis of dwarf galaxies with the Fermi Gamma-ray Space Telescope
High Energy Astrophysical Phenomena
2012-09-10 v2 Cosmology and Nongalactic Astrophysics
High Energy Physics - Phenomenology
Abstract
We perform a joint analysis of dwarf galaxy data from the Fermi Gamma-ray Space Telescope in search of dark matter annihilation into a gamma-ray line. We employ a novel statistical method that takes into account the spatial and spectral information of individual photon events from a sample of seven dwarf galaxies. Dwarf galaxies show no evidence of a gamma-ray line between 10 GeV and 1 TeV. The subsequent upper limit on the annihilation cross section to a two-photon final state is 3.9(+7.1)(-3.7) x 10^-26 cm^3/s at 130 GeV, where the errors reflect the systematic uncertainty in the distribution of dark matter within the dwarf galaxies.
Keywords
Cite
@article{arxiv.1206.0796,
title = {Dark matter line search using a joint analysis of dwarf galaxies with the Fermi Gamma-ray Space Telescope},
author = {Alex Geringer-Sameth and Savvas M. Koushiappas},
journal= {arXiv preprint arXiv:1206.0796},
year = {2012}
}
Comments
5 pages, 3 figures. Replaced with version accepted for publication as a Rapid Communication in PRD