论文标题
用fe k $α$线结构探测宇宙射线由多个电离过程产生
Probing Cosmic Rays with Fe K$α$ Line Structures Generated by Multiple Ionization Process
论文作者
论文摘要
超新星残留物（SNR）被视为银河宇宙射线的主要加速位点。最近的X射线研究表明，在某些SNR附近，浓密的气体中中性Fe K $α$线发射，可以通过在SNR中加速的亚相关性颗粒将其解释为气体中Fe原子的K壳电离。在这封信中，我们提出了一种新颖的方法来限制SNR中加速粒子的组成，目前尚不清楚。当能量重离子与靶原子碰撞时，它们的强库仑场很容易同时引起目标的多个内壳电子。这会导致特征X射线线能的变化，形成独特的光谱结构。在中性fe k $α$线中检测此类结构，强烈支持粒子电离方案，此外，直接证明了加速颗粒中重离子的直接证据。我们利用原子碰撞数据为各种弹丸离子构建了Fe K $α$线结构的模型。
Supernova remnants (SNRs) have been regarded as major acceleration sites of Galactic cosmic rays. Recent X-ray studies revealed neutral Fe K$α$ line emission from dense gas in the vicinity of some SNRs, which can be best interpreted as K-shell ionization of Fe atoms in the gas by sub-relativistic particles accelerated in the SNRs. In this Letter, we propose a novel method of constraining the composition of particles accelerated in SNRs, which is currently unknown. When energetic heavy ions collide with target atoms, their strong Coulomb field can easily cause simultaneous ejection of multiple inner-shell electrons of the target. This results in shifts in characteristic X-ray line energies, forming distinctive spectral structures. Detection of such structures in the neutral Fe K$α$ line strongly supports the particle ionization scenario, and furthermore provides direct evidence of heavy ions in the accelerated particles. We construct a model for the Fe K$α$ line structures by various projectile ions utilizing atomic-collision data.
