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arXiv 2008.02283astro-ph.HEastro-ph.CO
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探测银河系的暗物质晕寻找3.5 keV线

Probing the Milky Way's Dark Matter Halo for the 3.5 keV Line

Dominic Sicilian, Nico Cappelluti, Esra Bulbul, Francesca Civano, Massimo Moscetti, Christopher S. Reynolds

摘要:

我们提出了一个全面的搜索3.5千电子伏线,使用$\sim$ 51毫秒的档案钱德拉观测窥视通过银河系的暗物质晕从整个天空,通过钱德拉源目录发布2.0收集。我们认为数据的径向分布,组织观测到四个数据子集的基础上从银河系中心的角距离。所有数据均使用背景扣除和背景建模方法来建模,以考虑粒子仪器背景,从而证明粒子背景数据的当前可用的$\sim$ 1 M的统计限制。一个非检测报告中的总数据集,使我们能够设置一个上限3.5千电子伏线通量和约束无菌中微子暗物质混合角。sin $^2$(2 $θ$)的上限为$2.58 \times 10^{-11}$(尽管系统不确定性可能使其增加2倍),对应于$2.34 \times 10^{-7}$ ph s $^{-1}$ cm $^{-2}$的3.5 keV线通量的上限。这些限制与最近的限制和几个先前的检测一致。在所有径向数据子集中报告未检测,使我们能够约束3.5 keV线强度的空间分布,这与Navarro-Frenk-White预测没有决定性差异。因此,虽然提供了很大的限制,我们不完全排除不育中微子暗物质的情况下,或更一般的衰变暗物质的假设为3.5千电子伏线。我们还使用了在我们的连续谱中没有检测到任何未识别的发射线来进一步限制无菌中微子参数空间。

英文摘要:

We present a comprehensive search for the 3.5 keV line, using $\sim$51 Ms of archival Chandra observations peering through the Milky Way's Dark Matter Halo from across the entirety of the sky, gathered via the Chandra Source Catalog Release 2.0. We consider the data's radial distribution, organizing observations into four data subsets based on angular distance from the Galactic Center. All data is modeled using both background-subtracted and background-modeled approaches to account for the particle instrument background, demonstrating statistical limitations of the currently-available $\sim$1 Ms of particle background data. A non-detection is reported in the total data set, allowing us to set an upper-limit on 3.5 keV line flux and constrain the sterile neutrino dark matter mixing angle. The upper-limit on sin$^2$(2$θ$) is $2.58 \times 10^{-11}$ (though systematic uncertainty may increase this by a factor of $\sim$2), corresponding to the upper-limit on 3.5 keV line flux of $2.34 \times 10^{-7}$ ph s$^{-1}$ cm$^{-2}$. These limits show consistency with recent constraints and several prior detections. Non-detections are reported in all radial data subsets, allowing us to constrain the spatial profile of 3.5 keV line intensity, which does not conclusively differ from Navarro-Frenk-White predictions. Thus, while offering heavy constraints, we do not entirely rule out the sterile neutrino dark matter scenario or the more general decaying dark matter hypothesis for the 3.5 keV line. We have also used the non-detection of any unidentified emission lines across our continuum to further constrain the sterile neutrino parameter space.

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