论文标题
研究Fermi大面积望远镜的灵敏度，以检测银河中心的特征
Investigating the Fermi Large Area Telescope sensitivity of detecting the characteristics of the Galactic center excess
论文作者
论文摘要
银河系的中心是Astroparticle物理学中最引人注目的奥秘之一。费米大面积望远镜（LAT）收集的数据中的几组对伽马射线（GCE）进行了过多的测量。某些群体声称GCE的频谱和空间形态与暗物质银河系光环（DM）的信号兼容。取而代之的是，其他分析表明，GCE的性能，例如其能量谱，高度取决于银河系发射（IEM）模型源目录和分析技术的选择。在本文中，我们研究了费米 - 拉特对检测GCE特征的敏感性。特别是我们模拟了DM给出的GCE，并验证了对背景成分的完美知识，其能量谱，位置，空间形态和对称性得到了适当的测量。我们还检查了IEM模型中有缺陷的另外两个现实主义案例。在第一个中，我们有一个未模块的伽马射线源，由费米气泡的低纬度成分构成。在第二个中，我们使用一个IEM模板模拟数据，并与另一个模板分析数据。我们验证了IEM的不构层化引入了GCE能量谱的系统学在1-10 GEV之间的10-15％，而NFW DM密度谱的斜率值则在5％之间，该系统用于适合GCE空间形态。最后，我们展示了如何在替代过程中检测到GCE，例如来自脉冲星的凸起群的伽马射线发射，或者是从银河中心注入的电子，正上音或质子的。我们证明，对于每种情况，都有一个独特的吸烟枪标志，这将有助于确定GCE起源背后的真实机制。
The center of the Milky Way is offering one of the most striking mystery in Astroparticle Physics. An excess of gamma rays (GCE) has been measured by several groups in the data collected by the Fermi Large Area Telescope (LAT) towards the Galactic center region. The spectrum and spatial morphology of the GCE have been claimed by some groups to be compatible with a signal from the Galactic halo of dark matter (DM). Instead, other analyses have demonstrated that the GCE properties, e.g., its energy spectrum, highly depend on the choice of the Galactic interstellar emission (IEM) model source catalogs and analysis techniques. In this paper we investigate the sensitivity of Fermi-LAT to detect the characteristics of the GCE. In particular we simulate the GCE as given by DM and we verify that, with a perfect knowledge of the background components, its energy spectrum, position, spatial morphology and symmetry is properly measured. We also inspect two more realist cases for which there are imperfections in the IEM model. In the first we have an un-modeled gamma-ray source, constituted by the low-latitude component of the Fermi bubbles. In the second we simulate the data with one IEM template and analyze the data with an other. We verify that a mismodeling of the IEM introduces a systematics of about 10-15% in the GCE energy spectrum between 1-10 GeV and about 5% in the value of the slope for a NFW DM density profile, which is used to fit the GCE spatial morphology. Finally, we show how the GCE would be detected in case of alternative processes such as gamma-ray emission from a bulge population of pulsars or from electrons and positrons or protons injected from the Galactic center. We demonstrate that for each of these cases there is a distinctive smoking gun signature that would help to identify the real mechanism behind the origin of the GCE.
