Title: The Origin of the Cluster of Local Interstellar Clouds Show Chinese title

Title: 本地星际云复合体的起源

Abstract: The interstellar medium within $\rm\approx 15 \; pc$ of the Sun consists of a complex of fifteen diffuse, partially ionized clouds. Located within the Local Bubble, these clouds, known as the Cluster of Local Interstellar Clouds (CLIC), constitute the interstellar environment impinging upon our heliosphere. While each individual cloud can be modeled with a distinct velocity vector, the complex demonstrates a coherent bulk motion suggestive of a common origin. Here we examine two theories for the origin of the CLIC: that it formed due to an ionization front associated with nearby Str\"{o}mgren spheres and/or due to a nearby supernova explosion that occurred within the pre-evacuated cavity of the Local Bubble. Tracing back the trajectory of the clouds, we disfavor a purely Str\"{o}mgren sphere origin, given the CLIC's position interior to the surface of the most significant nearby Stromgren sphere and its motion transverse to the sphere's trajectory. Turning to a supernova origin, we model the formation of the CLIC assuming individual clouds have been swept up over time due to the expansion of a supernova remnant in its pressure-driven snowplow phase. We find that the 3D spatial-dynamical properties of the CLIC can be explained by the most recent supernova that exploded in the nearby Upper Centaurus Lupus cluster $\approx \rm 1.2 \; Myr$ ago and propagated into an ambient density of $n \approx 0.04 \;\rm cm^{-3}$. Our model predicts that the formation of the individual CLIC clouds occurred progressively over the past $1 \; \rm Myr$ and offers a natural explanation for the observed distribution, column density, temperature, and magnetic field structure of the complex. Show Chinese abstract

Abstract: 距离太阳$\rm\approx 15 \; pc$内的星际介质由十五个弥漫且部分电离的云组成的复合体构成。 这些云位于局部泡泡内，被称为本地星际云簇（CLIC），构成了冲击我们日球层的星际环境。 虽然每个单独的云都可以用一个独特的速度矢量来建模，但这个复合体表现出一种一致的大规模运动，暗示了它们可能有共同的起源。 在这里，我们研究了CLIC起源的两种理论：一是它是由附近的斯特龙根球相关的电离锋面形成的；二是由于发生在局部泡泡预清空腔内的附近超新星爆炸。 追踪这些云的轨迹，考虑到CLIC的位置在最显著的附近斯特龙根球表面内部，并且它的运动与该球体轨迹垂直，我们不支持纯粹的斯特龙根球起源。 转向超新星起源，我们假设单个云随着时间的推移被超新星遗迹的压力驱动雪犁阶段的扩展所扫过。 我们发现，CLIC的三维空间动力学特性可以通过大约$\approx \rm 1.2 \; Myr$年前在附近的Upper Centaurus Lupus星团中发生的最近一次超新星爆炸来解释，并传播到周围密度为$n \approx 0.04 \;\rm cm^{-3}$的环境中。 我们的模型预测，CLIC云的形成在过去$1 \; \rm Myr$中逐步发生，并自然地解释了该复合体观测到的分布、柱密度、温度和磁场结构。