论文标题
HAWC J1825-134的200个TEV光子的证据
Evidence of 200 TeV photons from HAWC J1825-134
论文作者
论文摘要
地球受到超偏见的颗粒的轰炸，称为宇宙射线（CRS）。据信，粒子光谱中的膝盖，具有少数PEV（= 10 $^{15} $ eV）的CRS被认为具有银河系来源。因此，PEV CRS或PEVATRON的一个或多个工厂必须在我们的银河系中活跃。由于在银河磁场中偏转，因此无法从其来源直接检测PEV质子。当Pev Crs与环境气体碰撞时，产生的一百个TEV $γ$ - 从衰减的$π^0 $ rays可以提供质子加速的决定性证据。在这里，我们报告了$γ$ - 雷来源的高空水切伦科夫（HAWC）天文台的发现，HAWC〜J1825-134，其能量谱远远超过200 TEV，而无需断裂或截止。发现该来源与巨大的分子云一致。环境气体密度高达700质子/厘米$^3 $。尽管这种极端加速器的性质尚不清楚，但CRS加速到与环境气体相撞的几个PEV的能量可能会产生观察到的辐射。
The Earth is bombarded by ultra-relativistic particles, known as cosmic rays (CRs). CRs with energies up to a few PeV (=10$^{15}$ eV), the knee in the particle spectrum, are believed to have a Galactic origin. One or more factories of PeV CRs, or PeVatrons, must thus be active within our Galaxy. The direct detection of PeV protons from their sources is not possible since they are deflected in the Galactic magnetic fields. Hundred TeV $γ$-rays from decaying $π^0$, produced when PeV CRs collide with the ambient gas, can provide the decisive evidence of proton acceleration up to the knee. Here we report the discovery by the High Altitude Water Cherenkov (HAWC) observatory of the $γ$-ray source, HAWC~J1825-134, whose energy spectrum extends well beyond 200 TeV without a break or cutoff. The source is found to be coincident with a giant molecular cloud. The ambient gas density is as high as 700 protons/cm$^3$. While the nature of this extreme accelerator remains unclear, CRs accelerated to energies of several PeV colliding with the ambient gas likely produce the observed radiation.
