论文标题
宇宙学模拟中暗物质Subhalos的速度依赖性歼灭辐射
Velocity-dependent annihilation radiation from dark matter subhalos in cosmological simulations
论文作者
论文摘要
我们在Auriga模拟中使用银河系状星系的套件来确定三种依赖速度依赖性的暗物质歼灭模型的暗物质Subhalos对an灭辐射的贡献：Sommerfeld，P-Wave和D-Wave模型。我们将它们与速度无关的S波歼灭模型中的相应分布进行了比较。对于流体动力学和仅暗的模拟，只有在Sommerfeld增强的歼灭的情况下，Subhalos的总an灭通量超过了卤素病毒半径内平滑光环分量的总歼灭通量。从Sommerfeld到S，P和D-WAVE模型的发展，Halo的平滑成分的贡献变得更加主导，这意味着对于P-Wave和D-Wave模型，平滑的组分是迄今为止对辐射的主要贡献。与Fermi-Lat观察到的银河系中心过量相比，对于所有模拟光环，发射都由光滑的光晕贡献主导。但是，对于Sommerfeld模型来说，推断至低于仿真的当前分辨率限制的质量尺度可能意味着对来自银河系中心区域的伽马射线发射的不可忽略的贡献。
We use the suite of Milky Way-like galaxies in the Auriga simulations to determine the contribution to annihilation radiation from dark matter subhalos in three velocity-dependent dark matter annihilation models: Sommerfeld, p-wave, and d-wave models. We compare these to the corresponding distribution in the velocity-independent s-wave annihilation model. For both the hydrodynamical and dark-matter-only simulations, only in the case of the Sommerfeld-enhanced annihilation does the total annihilation flux from subhalos exceed the total annihilation flux from the smooth halo component within the virial radius of the halo. Progressing from Sommerfeld to the s, p, and d-wave models, the contribution from the smooth component of the halo becomes more dominant, implying that for the p-wave and d-wave models the smooth component is by far the dominant contribution to the radiation. Comparing to the Galactic center excess observed by Fermi-LAT, for all simulated halos the emission is dominated by the smooth halo contribution. However, it is possible that for Sommerfeld models, extrapolation down to mass scales below the current resolution limit of the simulation would imply a non-negligible contribution to the gamma-ray emission from the Galactic Center region.
