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太阳附近的恒星形成是由局部气泡的膨胀驱动的

Star formation near the Sun is driven by expansion of the Local Bubble

Catherine Zucker, Alyssa A. Goodman, João Alves, Shmuel Bialy, Michael Foley, Joshua S. Speagle, Josefa Großschedl, Douglas P. Finkbeiner, Andreas Burkert, Dian… 展开作者

Catherine Zucker, Alyssa A. Goodman, João Alves, Shmuel Bialy, Michael Foley, Joshua S. Speagle, Josefa Großschedl, Douglas P. Finkbeiner, Andreas Burkert, Diana Khimey, Cameren Swiggum

备注：
Published in Nature on 12 January 2022. For data, interactive visualizations, and more information see https://sites.google.com/cfa.harvard.edu/local-bubble-star-formation
发表信息：
Nature 601, 334-337 (2022)
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摘要：

几十年来，我们已经知道太阳位于局部气泡内，这是一个低密度，高温等离子体的空腔，周围环绕着冷的中性气体和尘埃。然而，这个壳层的精确形状和范围，形成的动力和时间尺度，以及它与附近恒星形成的关系仍然不确定，这主要是由于当地星际介质的低分辨率模型。利用盖亚太空任务的新空间和动力学约束，我们在这里报告了对太阳200 pc范围内致密气体和年轻恒星的3D位置，形状和运动的分析。我们发现，几乎所有的恒星形成复合体在太阳附近的谎言的表面上的本地气泡和他们的年轻恒星表现出向外膨胀主要垂直于气泡的表面。这些年轻恒星的运动轨迹支持这样一种假设，即本地气泡的起源是恒星诞生的爆发，然后在气泡中心附近发生死亡（超新星），始于1400万年前。由超新星产生的局部气泡的膨胀将周围的星际介质扫入一个扩展的壳层，这个壳层现在已经碎裂并坍塌成附近最突出的分子云，反过来为超新星驱动的恒星形成理论提供了强有力的观测支持。

英文摘要：

For decades we have known that the Sun lies within the Local Bubble, a cavity of low-density, high-temperature plasma surrounded by a shell of cold, neutral gas and dust. However, the precise shape and extent of this shell, the impetus and timescale for its formation, and its relationship to nearby star formation have remained uncertain, largely due to low-resolution models of the local interstellar medium. Leveraging new spatial and dynamical constraints from the Gaia space mission, here we report an analysis of the 3D positions, shapes, and motions of dense gas and young stars within 200 pc of the Sun. We find that nearly all the star-forming complexes in the solar vicinity lie on the surface of the Local Bubble and that their young stars show outward expansion mainly perpendicular to the bubble's surface. Tracebacks of these young stars' motions support a scenario where the origin of the Local Bubble was a burst of stellar birth and then death (supernovae) taking place near the bubble's center beginning 14 Myr ago. The expansion of the Local Bubble created by the supernovae swept up the ambient interstellar medium into an extended shell that has now fragmented and collapsed into the most prominent nearby molecular clouds, in turn providing robust observational support for the theory of supernova-driven star formation.

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