论文标题
宇宙射线中光和中等组成光谱之间差异的源解释
Nearby source interpretation of differences among light and medium composition spectra in cosmic rays
论文作者
论文摘要
最近，AMS-02报道了原代宇宙射线的中等质量组成（霓虹灯，镁，硅）的能量光谱的精确测量，这些射线与光组合物（氦，碳，氧气）的特性不同。在这里，我们提出了一个附近的源场景，以及背景源贡献，以解释宇宙射线NE，MG，SI的新测量光谱，尤其是它们与He，C，O的差异。它们在高能量上的差异可以自然地由附近源的元素丰富。具体而言，附近源与NE，mg，SI元素的丰度比率低于$ \ sim1.7 $的倍数，而不是He，c，o元素。这种差异可能是由于祖细胞星的恒星演变或附近来源的加速过程/环境的恒星演变的丰度差异。这种情况可以同时解释乳霜/核子/dampe最近揭示的宇宙光谱的高能光谱特征，以及大规模各向异性的能量依赖性行为。可以预测，NE，MG，SI组的PEV能量低于PEV能量的偶极性各向异性幅度小于He，C，O组的偶极子，可以通过未来的测量进行测试。
Recently the AMS-02 reported the precise measurements of the energy spectra of medium-mass compositions (Neon, Magnesium, Silicon) of primary cosmic rays, which reveal different properties from those of light compositions (Helium, Carbon, Oxygen). Here we propose a nearby source scenario, together with the background source contribution, to explain the newly measured spectra of cosmic ray Ne, Mg, Si, and particularly their differences from that of He, C, O. Their differences at high energies can be naturally accounted for by the element abundance of the nearby source. Specifically, the abundance ratio of the nearby source to the background of the Ne, Mg, Si elements is lower by a factor of $\sim1.7$ than that of the He, C, O elements. Such a difference could be due to the abundance difference of the stellar evolution of the progenitor star or the acceleration process/environment, of the nearby source. This scenario can simultaneously explain the high-energy spectral softening features of cosmic ray spectra revealed recently by CREAM/NUCLEON/DAMPE, as well as the energy-dependent behaviors of the large-scale anisotropies. It is predicted that the dipole anisotropy amplitudes below PeV energies of the Ne, Mg, Si group are smaller than that of the He, C, O group, which can be tested with future measurements.
