Dark matter properties implied by gamma ray interstellar emission models

Csaba Balazs, Tong Li

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Abstract

We infer dark matter properties from gamma ray residuals extracted using eight different interstellar emission scenarios proposed by the Fermi-LAT Collaboration to explain the Galactic Center gamma ray excess. Adopting the most plausible simplified ansatz, we assume that the dark matter particle is a Majorana fermion interacting with standard fermions via a scalar mediator. To trivially respect flavor constraints, we only couple the mediator to third generation fermions. Using this theoretical hypothesis, and the Fermi residuals, we calculate Bayesian evidences, including Fermi-LAT exclusion limits from 15 dwarf spheroidal galaxies as well. Our evidence ratios single out one of the Fermi scenarios as most compatible with the simplified dark matter model. In this scenario the dark matter (mediator) mass is in the 25-200 (1-1000) GeV range and its annihilation is dominated by bottom quark final state. Our conclusion is that the properties of dark matter extracted from gamma ray data are highly sensitive to the modeling of the interstellar emission.
Original languageEnglish
Article number037
Number of pages21
JournalJournal of Cosmology and Astroparticle Physics
Volume2017
Issue number2
DOIs
Publication statusPublished - 20 Feb 2017

Keywords

  • dark matter theory
  • gamma ray experiments
  • gamma ray theory

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