arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1708.09385astro-ph.COastro-ph.HEhep-ph
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星系群中暗物质湮灭的研究

A Search for Dark Matter Annihilation in Galaxy Groups

Mariangela Lisanti, Siddharth Mishra-Sharma, Nicholas L. Rodd, Benjamin R. Safdi

摘要:

我们使用413周的公开可用的$\textit{Fermi}$ Pass 8伽马射线数据,结合最近开发的星系群目录,寻找河外晕中暗物质湮灭的证据。在我们的研究中,我们使用基于光度的质量估计和质量浓度关系来推断的$J$ -因子和相关的不确定性的红移范围内的数百个星系群$z \lesssim 0.03$。我们采用了保守的子结构增强因子模型,该模型仅通过$\mathcal{O}(1)$因子来增强灵敏度。没有发现暗物质湮灭的显着证据,我们排除热遗迹横截面低于$\sim$ 30 GeV的$b\bar{b}$湮灭通道的95%置信度的暗物质质量。这些界限与银河系矮球状卫星星系的界限相当。我们的分析结果增加了紧张,但不排除,银河系中心过剩的暗物质解释。我们提供了在这项研究中使用的星系群的目录和推断的属性,它可以广泛应用于河外暗物质的搜索。

英文摘要:

We use 413 weeks of publicly-available $\textit{Fermi}$ Pass 8 gamma-ray data, combined with recently-developed galaxy group catalogs, to search for evidence of dark matter annihilation in extragalactic halos. In our study, we use luminosity-based mass estimates and mass-to-concentration relations to infer the $J$-factors and associated uncertainties for hundreds of galaxy groups within a redshift range $z \lesssim 0.03$. We employ a conservative substructure boost-factor model, which only enhances the sensitivity by an $\mathcal{O}(1)$ factor. No significant evidence for dark matter annihilation is found and we exclude thermal relic cross sections for dark matter masses below $\sim$30 GeV to 95% confidence in the $b\bar{b}$ annihilation channel. These bounds are comparable to those from Milky Way dwarf spheroidal satellite galaxies. The results of our analysis increase the tension, but do not rule out, the dark matter interpretation of the Galactic Center excess. We provide a catalog of the galaxy groups used in this study and their inferred properties, which can be broadly applied to searches for extragalactic dark matter.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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