论文标题
暗物质歼灭和银河中心多余
Dark matter annihilation and the Galactic Centre Excess
论文作者
论文摘要
我们比较了银河中心过剩（GCE）的表面亮度曲线和形态，这些中心（GCE）在广角$γ$ - 射线地图中从费米大通区域望远镜望远镜中鉴定出来，与来自高分辨率$λ$ CDM CDM MAGNETOHETOHYDRENAGINIC模拟的高分辨率an灭预测。这些模拟产生了与银河系相当的结构，恒星种群，气体含量以及恒星和光晕质量的孤立，椎间盘主导的星系。为了进行具体的歼灭横截面选择，他们与完整观察到的角度范围内的费米 - 拉特数据非常吻合，$ 1^{\ circ} $ to $ 15^{\ circ} $，而它们的黑色仅对应物，缺乏通过baryons的重力效果，因为它无法预测baryons sections semports sempless sempless smert smert sempers inter in halo。这些结果为GCE通过消灭暗物质产生的假设提供了更多支持。但是，如果它是由不同的机制产生的，则意味着对an灭率的上限很强，可以将其转化为预期的$γ$ ray - ray - 不仅来自内部星系的通量，而且在银河系中，有或没有恒星的任何子结构。
We compare the surface brightness profile and morphology of the Galactic Centre Excess (GCE) identified in wide-angle $γ$-ray maps from the Fermi-Large Area Telescope to dark matter annihilation predictions derived from high-resolution $Λ$CDM magnetohydrodynamic simulations of galaxy formation. These simulations produce isolated, disc-dominated galaxies with structure, stellar populations, gas content, and stellar and halo masses comparable to those of the Milky Way. For a specific choice of annihilation cross-section, they agree well with the Fermi-LAT data over the full observed angular range, $1^{\circ}$ to $15^{\circ}$, whereas their dark-matter only counterparts, lacking any compression of the inner halo by the gravitational effects of the baryons, fail to predict emission as centrally concentrated as observed. These results provide additional support to the hypothesis that the GCE is produced by annihilating dark matter. If, however, it is produced by a different mechanism, they imply a strong upper limit on annihilation rates which can be translated into upper limits on the expected $γ$-ray flux not only from the inner Galaxy but also from any substructure, with or without stars, in the Galactic halo.
