论文标题
快速移动的脉冲星作为星际培养基的探针
Fast moving pulsars as probes of interstellar medium
论文作者
论文摘要
通过ISM移动的脉冲星在氢H $α$线排放中检测到的弓冲击。弓休克星云的形态使人们可以在尺度上探测ISM的性质$ \ sim 0.01 $ PC及较小。我们对Pulsar Bow休克进行了2D RMHD建模，并模拟了相应的H $α$发射形态。我们发现，即使是ISM密度的轻度空间不均匀性，$Δρ/ρ\ sim 1 $也会导致H $α$线发射中所看到的冲击形状的显着变化。我们成功地重现了吉他星云的形态。我们在ISM的温暖组件中推断出准周期密度变化，其特征长度为$ \ sim0.1 $ 〜pc。该量表的结构也可能导致X射线中Tycho SNR的正向冲击时看到的精细特征的形成。 ISM温暖成分中这种短期周期密度结构的形成令人困惑，而弓箭星云为研究这种现象提供了独特的探针。
Pulsars moving through ISM produce bow shocks detected in hydrogen H$α$ line emission. The morphology of the bow shock nebulae allows one to probe the properties of ISM on scales $\sim 0.01$ pc and smaller. We performed 2D RMHD modeling of the pulsar bow shock and simulated the corresponding H$α$ emission morphology. We find that even a mild spatial inhomogeneity of ISM density, $δρ/ρ\sim 1$, leads to significant variations of the shape of the shock seen in H$α$ line emission. We successfully reproduce the morphology of the Guitar Nebula. We infer quasi-periodic density variations in the warm component of ISM with a characteristic length of $\sim0.1$~pc. Structures of this scale might be also responsible for the formation of the fine features seen at the forward shock of Tycho SNR in X-rays. Formation of such short periodic density structures in the warm component of ISM is puzzling, and bow-shock nebulae provide unique probes to study this phenomenon.
