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

被引：52
|
作者：
Ahn, K [1 ]
Komatsu, E [1 ]
机构：
[1] Univ Texas, Dept Astron, Austin, TX 78712 USA
来源：
PHYSICAL REVIEW D | 2005年 / 72卷 / 06期
关键词：
D O I：
10.1103/PhysRevD.72.061301
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
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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页数：5
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