Diffuse gamma-ray background and cosmic-ray positrons from annihilating dark matter
Diffuse gamma-ray background and cosmic-ray positrons from annihilating dark matter
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DOI：
10.1103/physrevd.80.023517
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发表时间：
2009-04
影响因子：
5
通讯作者：
M. Kawasaki;K. Kohri;K. Nakayama
中科院分区：
文献类型：
--
作者：
M. Kawasaki;K. Kohri;K. Nakayama
我们研究了湮没暗物质对河外弥散伽马射线背景谱的贡献，其动机是最近观测到的宇宙射线正电子/电子反常。观测到的弥散伽马射线通量对暗物质模型提供了严格的约束，并给出了暗物质湮灭截面的上界。结果表明，对于中心暗物质晕轮廓，扩散伽马射线比银心伽马射线给出了更严格的边界。费米卫星将使束缚变得更强。
We study the annihilating dark matter contribution to the extragalactic diffuse gamma-ray background spectrum, motivated by the recent observations of cosmic-ray positron/electron anomalies. The observed diffuse gamma-ray flux provides stringent constraint on dark matter models and we present upper bounds on the annihilation cross section of the dark matter. It is found that for the case of cored dark matter halo profile, the diffuse gamma-rays give more stringent bound compared with gamma-rays from the Galactic center. The Fermi satellite will make the bound stronger.