arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1710.03215astro-ph.HEastro-ph.COhep-ph
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银河系的矮告诉我们关于银河系中心扩展过剩的信息

What the Milky Way's Dwarfs tell us about the Galactic Center extended excess

Ryan E. Keeley, Kevork N. Abazajian, Anna Kwa, Nicholas L. Rodd, Benjamin R. Safdi

摘要:

银河系的银河系中心藏有一个伽马射线过剩,这是一个候选的湮灭暗物质的信号。矮星系在其预期的相称辐射中仍然主要是黑暗的。在这项工作中,我们通过联合似然分析来量化这两个观测之间的一致性程度。在这样做的时候,我们将银河系暗物质晕轮廓的不确定性,以及在暗物质湮灭模型的费米伽马射线太空望远镜检测到的银河系中心扩展伽马射线过剩(GCE)的弥漫伽马射线发射的不确定性的会计。当包括这些未知量时,湮灭率和质量的优选范围扩大。即便如此,使用两个最近的银河系晕的局部密度的测定离开GCE的单通道暗物质湮灭模型的首选区域,在结合矮星系分析湮灭搜索的强烈张力。第三,更高的银河系密度测定,消除了这种紧张。我们的联合可能性分析使我们能够量化这种不一致性。我们提供了一套工具来测试暗物质湮灭模型在这个组合数据集内的一致性。作为一个例子,我们测试了一个代表性的逆康普顿源自相互作用的暗物质模型,这是一致的GCE和矮星。

英文摘要:

The Milky Way's Galactic Center harbors a gamma-ray excess that is a candidate signal of annihilating dark matter. Dwarf galaxies remain predominantly dark in their expected commensurate emission. In this work we quantify the degree of consistency between these two observations through a joint likelihood analysis. In doing so we incorporate Milky Way dark matter halo profile uncertainties, as well as an accounting of diffuse gamma-ray emission uncertainties in dark matter annihilation models for the Galactic Center Extended gamma-ray excess (GCE) detected by the Fermi Gamma-Ray Space Telescope. The preferred range of annihilation rates and masses expands when including these unknowns. Even so, using two recent determinations of the Milky Way halo's local density leave the GCE preferred region of single-channel dark matter annihilation models to be in strong tension with annihilation searches in combined dwarf galaxy analyses. A third, higher Milky Way density determination, alleviates this tension. Our joint likelihood analysis allows us to quantify this inconsistency. We provide a set of tools for testing dark matter annihilation models' consistency within this combined dataset. As an example, we test a representative inverse Compton sourced self-interacting dark matter model, which is consistent with both the GCE and dwarfs.

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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