Milagro observations have found bright, diffuse TeV emission concentrated along the galactic plane of the Milky Way. The intensity and spectrum of this emission is difficult to explain with current models of hadronic $\gamma$-ray production, and has been named the “TeV excess.” We show that TeV emission from pulsars naturally explains this excess. Recent observations have detected “TeV halos” surrounding pulsars that are either nearby or particularly luminous. Extrapolating this emission to the full population of Milky Way pulsars indicates that the ensemble of “subthreshold” sources necessarily produces bright TeV emission diffusively along the Milky Way plane. Models indicate that the TeV halo $\gamma$-ray flux exceeds that from hadronic $\gamma$ rays above an energy of $\sim 500\mathrm{GeV}$. Moreover, the spectrum and intensity of TeV halo emission naturally matches the TeV excess. Finally, we show that upcoming HAWC observations will resolve a significant fraction of the TeV excess into individual TeV halos, conclusively confirming, or ruling out, this model.

中文翻译：

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Pulsar TeV Halos解释了Milagro观察到的弥漫性TeV过量

Milagro的观测发现沿银河系银河平面集中的明亮的，分散的TeV发射。当前发射的强子模型很难解释这种发射的强度和光谱$\gamma$射线生产，并被称为“ TeV多余”。我们表明脉冲星的TeV发射自然可以解释这种过量现象。最近的观测发现在附近或特别发光的脉冲星周围出现“ TeV晕”。将这种发射推算到银河系脉冲星的全部种群中，表明“亚阈值”源的集合必定会沿着银河系产生漫射的明亮TeV发射。模型表明TeV晕$\gamma$射线通量超过强子射线通量 $\gamma$ 能量高于 $〜500\mathrm{GeV}$。此外，TeV光晕发射的光谱和强度自然可以与TeV过量相匹配。最后，我们表明，即将进行的HAWC观测将把大部分TeV过量分解为单个TeV晕圈，从而最终确认或排除该模型。