Dark matter annihilation: The origin of cosmic gamma-ray background at 1-20 MeV

Journal Article · Thu Sep 15 00:00:00 EDT 2005 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PhysRevD.72.061301· OSTI ID:20713503

Ahn, Kyungjin; Komatsu, Eiichiro ^[1]

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1. Department of Astronomy, University of Texas at Austin, 1 University Station, C1400, Austin, Texas 78712 (United States)

The origin of the cosmic {gamma}-ray background at 1-20 MeV remains a mystery. We show that {gamma}-ray emission accompanying annihilation of 20 MeV dark-matter particles explains most of the observed signal. Our model satisfies all of the current observational constraints, and naturally provides the origin of 'missing' {gamma}-ray background at 1-20 MeV and 511 keV line emission from the Galactic center. We conclude that {gamma}-ray observations support the existence of 20 MeV dark-matter particles. Improved measurements of the {gamma}-ray background in this energy band undoubtedly test our proposal.

• OSTI ID: 20713503
• Journal Information: Physical Review. D, Particles Fields, Vol. 72, Issue 6; Other Information: DOI: 10.1103/PhysRevD.72.061301; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANNIHILATION
COSMIC GAMMA SOURCES
COSMIC PHOTONS
COSMOLOGY
GAMMA RADIATION
GAMMA SPECTRA
KEV RANGE
MEV RANGE
NONLUMINOUS MATTER
PHOTON EMISSION