Decaying vs. annihilating dark matter in light of a tentative gamma-ray line

Journal Article · Wed Aug 01 04:00:00 EDT 2012 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2012/08/035· OSTI ID:22279871

Buchmüller, Wilfried; Garny, Mathias ^[1]

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1. Deutsches Elektronen-Synchrotron DESY, 22607 Hamburg (Germany)

Recently reported tentative evidence for a gamma-ray line in the Fermi-LAT data is of great potential interest for identifying the nature of dark matter. We compare the implications for decaying and annihilating dark matter taking the constraints from continuum gamma-rays, antiproton flux and morphology of the excess into account. We find that higgsino and wino dark matter are excluded, also for nonthermal production. Generically, the continuum gamma-ray flux severely constrains annihilating dark matter. Consistency of decaying dark matter with the spatial distribution of the Fermi-LAT excess would require an enhancement of the dark matter density near the Galactic center.

• OSTI ID: 22279871
• Journal Information: Journal of Cosmology and Astroparticle Physics, Journal Name: Journal of Cosmology and Astroparticle Physics Journal Issue: 08 Vol. 2012; ISSN 1475-7516
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
ANTIPROTONS
ASTROPHYSICS
COMPARATIVE EVALUATIONS
COSMIC PHOTONS
COSMOLOGY
DENSITY
GAMMA RADIATION
MILKY WAY
MORPHOLOGY
NONLUMINOUS MATTER
SPATIAL DISTRIBUTION