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arXiv 1209.3015astro-ph.HEastro-ph.COastro-ph.GAhep-ph
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银心区域暗物质湮灭截面的严格和鲁棒约束

Stringent and Robust Constraints on the Dark Matter Annihilation Cross Section From the Region of the Galactic Center

Dan Hooper, Chris Kelso, Farinaldo S. Queiroz

摘要:

对于任何现实的晕轮廓,银河系中心被预测为来自暗物质湮灭的最明亮的伽马射线源。由于在很大程度上与暗物质分布和天体物理背景的不确定性,然而,最常用的暗物质湮灭截面的限制已来自其他地区,如矮球状星系。在这篇文章中,我们研究费米伽玛射线空间望远镜的数据从内星系的方向,并推导出严格的上限暗物质的湮灭截面。即使是非常保守的情况下,一个暗物质分布的显着(~kpc)恒定密度的核心,归一化到最小的密度需要,以适应旋转曲线和微透镜测量,我们发现,银河系中心的约束是严格的矮星系(这是根据NFW分布的假设)。对于NFW或Einasto轮廓(同样,归一化到最小允许密度),银河系中心的约束通常比来自矮星的约束更强。

英文摘要:

For any realistic halo profile, the Galactic Center is predicted to be the brightest source of gamma-rays from dark matter annihilations. Due in large part to uncertainties associated with the dark matter distribution and astrophysical backgrounds, however, the most commonly applied constraints on the dark matter annihilation cross section have been derived from other regions, such as dwarf spheroidal galaxies. In this article, we study Fermi Gamma-Ray Space Telescope data from the direction of the inner Galaxy and derive stringent upper limits on the dark matter's annihilation cross section. Even for the very conservative case of a dark matter distribution with a significant (~kpc) constant-density core, normalized to the minimum density needed to accommodate rotation curve and microlensing measurements, we find that the Galactic Center constraint is approximately as stringent as those derived from dwarf galaxies (which were derived under the assumption of an NFW distribution). For NFW or Einasto profiles (again, normalized to the minimum allowed density), the Galactic Center constraints are typically stronger than those from 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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