Dark matter constraints from observations of 25 Milky Way satellite galaxies with the Fermi Large Area Telescope
Dark matter constraints from observations of 25 Milky Way satellite galaxies with the Fermi Large Area Telescope
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DOI：
10.1103/physrevd.89.042001
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发表时间：
2014-02-11
影响因子：
5
通讯作者：
Zimmer, S.
中科院分区：
文献类型：
--
作者：
Ackermann, M.;Albert, A.;Zimmer, S.
银河系的矮球状卫星星系是已知的暗物质占主导地位的天体之一。由于它们的接近，高暗物质含量和缺乏天体物理背景，矮球状星系被广泛认为是通过伽马射线间接探测暗物质的最有前途的目标之一。在这里，我们报告。利用费米大天区望远镜（LAT）4年的观测资料，对25个银河系矮球状卫星星系进行了X射线观测。没有一个矮星系被明显地探测到。射线，我们提出。射线通量上限在500 MeV和500 GeV之间。我们从恒星运动学数据中确定了18个矮球状星系的暗物质含量，并结合联合收割机对15个矮星系的LAT观测来约束暗物质湮灭截面。我们设置了一些最严格的限制，到目前为止的湮灭暗物质粒子的质量在2 GeV和10 TeV到原型标准模型通道。我们发现这些结果对LAT仪器性能的系统不确定性具有鲁棒性，扩散。射线背景建模，并假设暗物质密度轮廓。
The dwarf spheroidal satellite galaxies of the Milky Way are some of the most dark-matter-dominated objects known. Due to their proximity, high dark matter content, and lack of astrophysical backgrounds, dwarf spheroidal galaxies are widely considered to be among the most promising targets for the indirect detection of dark matter via gamma rays. Here we report on.-ray observations of 25 Milky Way dwarf spheroidal satellite galaxies based on 4 years of Fermi Large Area Telescope (LAT) data. None of the dwarf galaxies are significantly detected in. rays, and we present.-ray flux upper limits between 500 MeV and 500 GeV. We determine the dark matter content of 18 dwarf spheroidal galaxies from stellar kinematic data and combine LAT observations of 15 dwarf galaxies to constrain the dark matter annihilation cross section. We set some of the tightest constraints to date on the annihilation of dark matter particles with masses between 2 GeV and 10 TeV into prototypical standard model channels. We find these results to be robust against systematic uncertainties in the LAT instrument performance, diffuse.-ray background modeling, and assumed dark matter density profile.