评论文章“暗物质搜索香蕉：钾（和氯）的贡献，以3.5 keV线”由T。Jeltema和S. Profumo
Comment on the paper "Dark matter searches going bananas: the contribution of Potassium (and Chlorine) to the 3.5 keV line" by T. Jeltema and S. Profumo
摘要：
我们重新审视了仙女座星系中央14'的X射线光谱，在我们以前的工作中讨论过[1402.4119]。最近在[1408.1699]中，有人声称，如果将数据分析限制在3-4 keV区间，则在3.53 keV处检测到的线的显著性下降到2 sigma以下。在这份说明中，我们表明，这样的限制是不合理的，作为连续体是很好地建模为幂律高达8千电子伏，和背景模型的参数很好地约束在这个较大的能量区间。这允许在3.53 keV处检测具有大于~3 sigma的统计显著性的谱线，并且允许在3-4 keV的能量范围内识别几个已知的原子谱线。将分析限制在3-4 keV区间导致不确定性增加，从而降低了检测的重要性。我们还认为，包括M31的数据，一致的解释3.53千电子伏线K XVIII的原子线在所有研究对象是有问题的。
英文摘要：
We revisit the X-ray spectrum of the central 14' of the Andromeda galaxy, discussed in our previous work [1402.4119]. Recently in [1408.1699] it was claimed that if one limits the analysis of the data to the interval 3-4 keV, the significance of the detection of the line at 3.53 keV drops below 2 sigma. In this note we show that such a restriction is not justified, as the continuum is well-modeled as a power law up to 8 keV, and parameters of the background model are well constrained over this larger interval of energies. This allows for a detection of the line at 3.53 keV with a statistical significance greater than ~3 sigma and for the identification of several known atomic lines in the energy range 3-4 keV. Limiting the analysis to the 3-4 keV interval results in increased uncertainty, thus decreasing the significance of the detection. We also argue that, with the M31 data included, a consistent interpretation of the 3.53 keV line as an atomic line of K XVIII in all studied objects is problematic.
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