论文标题
幻影威胁：关于银河中心多余的形态
A Phantom Menace: On the Morphology of the Galactic Center Excess
论文作者
论文摘要
在伽马射线能量（尤其是GCE的形态）中观察到的银河中心过量（GCE）发射的特征仍然是一个备受争议的主题。据称对主要的弥漫性γ射线背景进行了建模的方式，对首选形态具有确定的影响。在这项工作中，我们比较了银河弥漫性伽马射线发射背景的两种不同的方法：第一种方法通过根据定义明确的天体物理假设计算的模板对这种发射进行模型，而第二种方法将背景伽马射线发射的替代物分隔为cylactrical cylindrical cylactrical caltactrical falactrical falactrictric rys与独立的独立正常化。在我们重点关注的纬度上，我们发现前者的方法效果更好，并且当GCE遵循暗物质歼灭的形态时，可以获得整体最佳拟合度。在定量上，与最佳环基拟合相比，在Chi^2中的改进约为6500，在贝叶斯证据的日志中约为4000。
The characteristics of the Galactic Center Excess (GCE) emission observed in gamma-ray energies -- especially the morphology of the GCE -- remain a hotly debated subject. The manner in which the dominant diffuse gamma-ray background is modeled has been claimed to have a determining effect on the preferred morphology. In this work, we compare two distinct approaches to the galactic diffuse gamma-ray emission background: the first approach models this emission through templates calculated from a sequence of well-defined astrophysical assumptions, while the second approach divides surrogates for the background gamma-ray emission into cylindrical galactocentric rings with free independent normalizations. At the latitudes that we focus on, we find that the former approach works better, and that the overall best fit is obtained for an astrophysically motivated fit when the GCE follows the morphology expected of dark matter annihilation. Quantitatively, the improvement compared to the best ring-based fits is roughly 6500 in the chi^2 and roughly 4000 in the log of the Bayesian evidence.
