论文标题
关于来自银河中心和M31的伽马射线过剩的暗物质解释
On Dark Matter Explanations of the Gamma-Ray Excesses from the Galactic Center and M31
论文作者
论文摘要
现在已经确定了向银河系中心（GC）的过量伽马射线信号的存在，被称为GC过量。信号的主要解释包括沿视线，未解决的毫秒脉冲星人群和/或暗物质的灭绝（DM）的银河弥散发射的误导。最近，已经报道了M31外晕的另一个过量伽马射线信号的证据。在这项工作中，我们解释了DM歼灭框架中M31的GC和外光环的多余信号，并表明一旦考虑了J-Factors，这两个光谱与DM原点一致。我们进一步将过剩物与DM歼灭模型进行比较，并确定相应的最佳拟合参数。我们发现两种身体和四个身体歼灭模式的频谱都非常适合。
The presence of an excess gamma-ray signal toward the Galactic center (GC) has now been well established, and is known as the GC excess. Leading explanations for the signal include mis-modeling of the Galactic diffuse emission along the line of sight, an unresolved population of millisecond pulsars, and/or the annihilation of dark matter (DM). Recently, evidence for another excess gamma-ray signal has been reported toward the outer halo of M31. In this work we interpret the excess signals from both the GC and outer halo of M31 in the framework of DM annihilation, and show that the two spectra are consistent with a DM origin once J-factors are taken into account. We further compare the excesses to models of DM annihilation, and determine the corresponding best-fit parameters. We find good fits to the spectrum both in two body and four body annihilation modes.
