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arXiv 1503.05922astro-ph.COastro-ph.HE
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粒子暗物质在Local Group外搜索

Particle dark matter searches outside the Local Group

Marco Regis, Jun-Qing Xia, Alessandro Cuoco, Enzo Branchini, Nicolao Fornengo, Matteo Viel

备注：
6+3 pages, 6+3 figures; v2: corrected a typo and added a ref. v3: minor changes in the main text, Supplemental Material added, to appear in PRL
发表信息：
Phys. Rev. Lett. 114, 241301 (2015)
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摘要：

如果暗物质（DM）是由与普通物质非引力耦合的粒子组成的，它们在宇宙结构中的湮灭或衰变可以导致可检测到的辐射。我们发现，最强大的技术来检测粒子DM信号的本地组以外的是研究与低红移引力探针的非引力信号的角互相关。这种方法允许增强来自宇宙中优先产生DM诱导发射的区域的信噪比。我们展示了这种方法的力量，通过专注于GeV-TeV DM和最近的交叉相关分析之间的2 MASS星系目录和费米-LAT伽马射线地图。我们表明，这种技术比其他河外伽玛射线探测器，如能谱和角自相关的河外背景，从星系团的发射更敏感。有趣的是，我们发现，测得的互相关可以很好地拟合DM组件，与热湮灭截面和质量之间的10和100 GeV，取决于小规模DM属性和伽马射线生产机制。这需要进一步收集数据和进行专门分析。

英文摘要：

If dark matter (DM) is composed by particles which are non-gravitationally coupled to ordinary matter, their annihilations or decays in cosmic structures can result in detectable radiation. We show that the most powerful technique to detect a particle DM signal outside the Local Group is to study the angular cross-correlation of non-gravitational signals with low-redshift gravitational probes. This method allows to enhance signal-to-noise from the regions of the Universe where the DM-induced emission is preferentially generated. We demonstrate the power of this approach by focusing on GeV-TeV DM and on the recent cross-correlation analysis between the 2MASS galaxy catalogue and the Fermi-LAT gamma-ray maps. We show that this technique is more sensitive than other extragalactic gamma-ray probes, such as the energy spectrum and angular autocorrelation of the extragalactic background, and emission from clusters of galaxies. Intriguingly, we find that the measured cross-correlation can be well fitted by a DM component, with thermal annihilation cross section and mass between 10 and 100 GeV, depending on the small-scale DM properties and gamma-ray production mechanism. This solicits further data collection and dedicated analyses.

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