论文标题
银河系光环的速度依赖性$ j $ factor：银河系凸起中会发生什么？
The Velocity-Dependent $J$-factor of the Milky Way Halo: Does What Happens in the Galactic Bulge Stay in the Galactic Bulge?
论文作者
论文摘要
我们考虑了光子信号的角度分布，这可能是由银河凸起内速度依赖性暗物质歼灭产生的。我们发现，对于sommerfeld增强的歼灭的情况，凸起内的暗物质歼灭是由慢速颗粒所占据的，速度颗粒永远不会留下凸起，使人们可以在银河系凸起内的暗物质和角度分布之间找到简单的分析关系。另一方面，对于$ p $ - 或$ d $ - 波 - 波浪的歼灭，我们发现可以使凸起的高速颗粒一小部分为凸起内的暗物质歼灭提供了重要的，通常是占主导地位的贡献。对于这些情况，完全理解银河凸起内部深处的暗物质，以及所得光子信号的角度分布，需要对凸起之外的暗物质概况了解。根据这些结果，我们考虑了银河系中心的过度，并发现以$ p $ - 波 - 波浪an灭的方式解释了这种过剩的解释，将需要凸起内的暗物质概况比通常所考虑的要陡峭得多，但与凸起外部轮廓的行为有关。
We consider the angular distribution of the photon signal which could arise from velocity-dependent dark matter annihilation within the Galactic bulge. We find that, for the case of Sommerfeld-enhanced annihilation, dark matter annihilation within the bulge is dominated by slow speed particles which never leave the bulge, allowing one to find a simple analytic relationship between the dark matter profile within the Galactic bulge and the angular distribution. On the other hand, for the case $p$- or $d$-wave annihilation, we find that the small fraction of high-speed particles which can leave the bulge provide a significant, often dominant, contribution to dark matter annihilation within the bulge. For these scenarios, fully understanding dark matter annihilation deep within the Galactic bulge, and the angular distribution of the resulting photon signal, requires an understanding of the dark matter profile well outside the bulge. We consider the Galactic Center excess in light of these results, and find that an explanation of this excess in terms of $p$-wave annihilation would require the dark matter profile within the bulge to have a much steeper profile than usually considered, but with uncertainties related to the behavior of the profile outside the bulge.
