黑暗骑士
The Dark Knight Falters
摘要：
Su & Finkbeiner（2012 c）最近报道了来自16个非关联费米-LAT点源的111和129 GeV的势线发射。再加上费米在银河系中心附近的一个区域看到的类似特征，这些证据被解释为暗物质湮灭或内部韧致辐射的光谱特征。通过监督机器学习算法和档案多波长观测的结合，我们发现在Su & Finkbeiner样本中显示线发射的16个无关联源中有14个最有可能是活动星系核（AGN）。基于这一新的证据，我们必须扩大100-140 GeV过剩的可能解决方案的范围，以包括一个非常独特的天体物理学解释。虽然我们不能排除银河系中心线发射的暗物质来源，但我们认为，如果苏和芬克拜纳样本中的探测确实是真实的，那么它可能与附近（z < 0.2）活动星系核中的吸积、气泡或喷流活动有关。或者，在适当的条件下，相似性可能是由于河外背景光（EBL）吸收引起的偶然发生。否则，人们必须承认，这些特征是仪器或校准问题的人为产物。
英文摘要：
Potential line emission at 111 and 129 GeV from 16 unassociated Fermi-LAT point sources has been reported recently by Su & Finkbeiner (2012c). Together with similar features seen by Fermi in a region near the Galactic Centre, the evidence has been interpreted as the spectral signature of dark matter annihilation or internal bremsstrahlung. Through a combination of supervised machine-learning algorithms and archival multiwavelength observations we find that 14 out of the 16 unassociated sources showing the line emission in the Su & Finkbeiner sample are most likely active galactic nuclei (AGN). Based on this new evidence, one must widen the range of possible solutions for the 100-140 GeV excess to include a very distinct astrophysical explanation. While we cannot rule out a dark matter origin for the line emission in the Galactic Centre, we posit that if the detection in the Su & Finkbeiner sample is indeed real it might be related to accretion, bubble, or jet activity in nearby (z < 0.2) AGN. Alternatively, given the right conditions, the similarity could be due to a chance occurrence caused by extragalactic background light (EBL) absorption. Or else one must concede that the features are an artefact of instrumental or calibration issues.
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。
