Search for dark matter annihilation in the Milky Way halo

Laura J. Chang, Mariangela Lisanti, and Siddharth Mishra-Sharma
Phys. Rev. D 98, 123004 – Published 11 December 2018

Abstract

The Milky Way halo is the brightest source of dark matter annihilation in the sky. Indeed, the potential strength of the Galactic dark matter signal can supersede that expected from dwarf galaxies and galaxy groups even in regions away from the inner galaxy. In this paper, we present the results of a search for dark matter annihilation in the smooth Milky Way halo for |b|>20° and r<50° using 413 weeks of Fermi Pass 8 data within the energy range of 0.850GeV. We exclude thermal dark matter with mass below 70GeV that annihilates to bb¯ at the 95% confidence level using the p6v11 cosmic-ray foreground model, providing the strongest limits on the annihilation cross section in this mass range. These results exclude the region of dark matter parameter space that is consistent with the excess of GeV photons observed at the Galactic center for the bb¯ annihilation channel and, for the first time, start probing the τ+τ explanation. We explore how these results depend on uncertainties in the foregrounds by varying over a set of reasonable models.

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  • Received 8 May 2018
  • Revised 14 September 2018

DOI:https://doi.org/10.1103/PhysRevD.98.123004

© 2018 American Physical Society

Physics Subject Headings (PhySH)

Gravitation, Cosmology & AstrophysicsParticles & Fields

Authors & Affiliations

Laura J. Chang, Mariangela Lisanti, and Siddharth Mishra-Sharma

  • Department of Physics, Princeton University, Princeton, New Jersey 08544, USA

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Issue

Vol. 98, Iss. 12 — 15 December 2018

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