Gordian Edenhofer, João Alves, Catherine Zucker, Laura Posch, Torsten A. Enßlin
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引用次数: 0
摘要
三维尘埃绘图技术的最新进展改变了我们对银河系本地星际介质的认识,使我们能够首次从三维空间探索其结构。在这封信中,我们利用 Edenhofer 等人绘制的最新三维尘埃地图,研究了距离太阳约 200 pc 的著名的 Chameleon、Musca 和 Coalsack 云复合体。我们发现,这三个复合体并不是孤立的,而是连接在一起,形成了一个定义惊人的半环,构成了一个单一的 C 形云,半径约为 50 pc,厚度约为 45 pc,总质量约为 5 × 104 M⊙,如果包括 C 形云附近的所有物质,则总质量为 9 × 104 M⊙。尽管其中心没有明显的反馈源,但与C型结构相关的年轻恒星簇的动力学表明,大约4 Myr-10 Myr前的一次超新星爆炸很可能形成了这一结构。我们的研究结果支持这些云团复合体的单一起源故事,认为它们是由反馈驱动的气体压缩形成的,并对反馈主导区域(如天蝎座-半人马座联合体)中恒星形成云团的诞生过程提供了新的见解。
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 × 104M⊙, or 9 × 104M⊙ 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–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.
期刊介绍:
Astronomy & Astrophysics is an international Journal that publishes papers on all aspects of astronomy and astrophysics (theoretical, observational, and instrumental) independently of the techniques used to obtain the results.