Cosmological lower bound on dark matter masses from the soft gamma-ray background

被引:30
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 / 71卷 / 02期
关键词
D O I
10.1103/PhysRevD.71.021303
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Motivated by a recent detection of 511 keV photons from the center of our Galaxy, we calculate the spectrum of the soft gamma-ray background of the redshifted 511 keV photons from cosmological halos. Annihilation of dark matter particles into electron-positron pairs makes a substantial contribution to the gamma-ray background. Mass of such dark matter particles must be less than or similar to100 MeV so that resulting electron-positron pairs are nonrelativistic. On the other hand, we show that in order for the annihilation not to exceed the observed background, the dark matter mass needs to be greater than or similar to20 MeV. We include the contribution from the active galactic nuclei and supernovae. The halo substructures may increase the lower bound to greater than or similar to60 MeV.
引用
收藏
页码:021303 / 1
页数:5
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