Dark Matter Annihilation: the origin of cosmic gamma-ray background at 1-20 MeV

Details Dark Matter Annihilation: the origin of cosmic gamma-ray background at 1-20 MeV Dark Matter Annihilation: the origin of cosmic gamma-ray background at 1-20 MeV

2005-06-22

arxiv.org/abs/astro-ph/0506520v3

Phys.Rev.D72:061301,2005

Astronomy and Astrophysics

Astrophysics

5 pages, 3 figurs; Note added in proof, in response to Rasera et al. (astro-ph/0507707); published version in PRD, Rapid Commu

Scientific paper

10.1103/PhysRevD.72.061301

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.

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