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

来源：

PHYSICAL REVIEW LETTERS | 2005年 / 94卷 / 17期

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.

引用

页数：4

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