Can galactic dark matter substructure contribute to the cosmic gamma-ray anisotropy?

被引：6

作者：

Lange, J. U. ^{[1
,2
]}

Chu, M. -C. ^{[2
]}

机构：

[1] Heidelberg Univ, Inst Theoret Phys, D-69120 Heidelberg, Germany

[2] Chinese Univ Hong Kong, Dept Phys, Shatin, Hong Kong, Peoples R China

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2015年 / 447卷 / 01期

关键词：

Galaxy: structure; dark matter; gamma-rays: diffuse background; LARGE-AREA TELESCOPE; ANNIHILATION SIGNAL; SOURCE CATALOG; MILKY-WAY; 1ST; SATELLITES; HALO;

D O I：

10.1093/mnras/stu2459

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The annihilation of dark matter (DM) particles in the Milky Way can contribute to the diffuse gamma-ray background (DGRB). Due to the presence of substructures, this emission will appear anisotropic in a predictable way. We generate full-skymaps of the gamma-ray emission in galactic substructures from results of the high-resolution Via Lactea II N-body simulation of the Milky Way DM halo. We calculate the anisotropy pattern, taking into account different radial profiles of the DM distribution in substructures, cosmic variance, and the detection threshold, and compare it to the anisotropy in the DGRB observed by the Fermi Large Area Telescope (LAT). By comparing the upper limits on the DM self-annihilation cross-section, <sigma v >, implied by the anisotropy to the intensity of the DGRB and detected sources in the LAT 2-yr Point Source Catalog, we find that galactic substructure cannot contribute to the anisotropies in the DGRB without strongly violating these observations. Our results challenge the perception that small-scale anisotropies in the DGRB can be used as a probe of DM annihilation in galactic subhaloes.

引用

页码：939 / 947

页数：9

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