“C”：巨大的Chameleon-Musca-Coalsack云
The "C": The large Chameleon-Musca-Coalsack cloud
AI总结：
本研究利用最新三维尘埃图发现Chameleon、Musca和Coalsack云复合体连接成一个半径约50秒差距的C形巨云，总质量约5万太阳质量，并推测约400万至1000万年前的一次超新星爆发塑造了其结构，支持单一反馈驱动起源假说。
摘要：
近年来，三维尘埃绘图技术的进步彻底改变了我们对银河系本地星际介质的理解，使我们首次能够在三维空间中探索其结构。在本信中，我们利用Edenhofer等人最新的三维尘埃图，研究了距离太阳约200秒差距的著名Chameleon、Musca和Coalsack云复合体。我们发现这三个复合体并非孤立存在，而是相互连接，形成一个轮廓清晰的半环，构成一个单一的C形云，其半径约50秒差距，厚度约45秒差距，总质量约为$5 \times 10^{4} \mathrm{M}_{\odot}$；若将C形云附近的所有物质都包括在内，则质量约为$9 \times 10^{4} \mathrm{M}_{\odot}$。尽管其中心缺乏明显的反馈源，但与C形结构相关的年轻星团的动力学表明，大约400万至1000万年前的一次超新星爆发可能塑造了这一结构。我们的发现支持这些云复合体具有单一起源的故事，表明它们是由反馈驱动的气体压缩形成的，并为理解在反馈主导区域（如Scorpius-Centaurus星协）中恒星形成云的诞生过程提供了新的见解。
英文摘要：
Recent advancements in 3D dust mapping have transformed our understanding of the Milky Way's local interstellar medium, enabling us to explore its structure in three spatial dimensions for the first time. In this Letter, we use the most recent 3D dust map by Edenhofer et al. to study the well-known Chameleon, Musca, and Coalsack cloud complexes, located about 200 pc from the Sun. We find that these three complexes are not isolated but rather connect to form a surprisingly well-defined half-ring, constituting a single C-shaped cloud with a radius of about 50 pc, a thickness of about 45 pc, and a total mass of about $5 \times 10^{4} \mathrm{M}_{\odot}$, or $9 \times 10^{4} \mathrm{M}_{\odot}$ if including everything in the vicinity of the C-shaped cloud. Despite the absence of an evident feedback source at its center, the dynamics of young stellar clusters associated with the C structure suggest that a single supernova explosion about 4 Myr to 10 Myr ago likely shaped this structure. Our findings support a single origin story for these cloud complexes, suggesting that they were formed by feedback-driven gas compression, and offer new insights into the processes that govern the birth of star-forming clouds in feedback-dominated regions, such as the Scorpius-Centaurus association.
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