Can dark matter annihilation dominate the extragalactic gamma-ray background?

被引:53
作者
Ando, S [1 ]
机构
[1] Univ Tokyo, Sch Sci, Dept Phys, Tokyo 1130033, Japan
关键词
D O I
10.1103/PhysRevLett.94.171303
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
Annihilating dark matter (DM) has been discussed as a possible source of gamma rays from the galactic center and as a contribution to the extragalactic gamma-ray background. Assuming universality of the density profile of DM halos, we show that it is quite unlikely that DM annihilation is a main constituent of extragalactic gamma-ray background, without exceeding the observed gamma-ray flux from the galactic center. This argument becomes stronger when we include enhancement of the density profiles by supermassive black holes or baryon cooling. The presence of a substructure may loosen the constraint, but only if a very large cross section as well as the rather flat profile are realized.
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