Star formation near the Sun is driven by expansion of the Local Bubble
Star formation near the Sun is driven by expansion of the Local Bubble
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DOI：
10.1038/s41586-021-04286-5
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发表时间：
2022-01
期刊：
影响因子：
64.8
通讯作者：
C. Zucker;A. Goodman;João Alves;S. Bialy;M. Foley;J. Speagle;Josefa Groβschedl;D. Finkbeiner;A. Burkert;Diana Khimey;Cameren N. Swiggum
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文献类型：
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作者：
C. Zucker;A. Goodman;João Alves;S. Bialy;M. Foley;J. Speagle;Josefa Groβschedl;D. Finkbeiner;A. Burkert;Diana Khimey;Cameren N. Swiggum
几十年来，我们已经知道太阳位于局部气泡内，这是一个低密度的空腔，高温等离子体被冷的中性气体和尘埃包围。然而，这个壳层的精确形状和范围，它形成的动力和时间尺度，以及它与附近星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。在这里，我们报告的三维位置，形状和运动的致密气体和年轻的恒星在200 pc的太阳，使用新的空间和动力学约束的分析。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。这些年轻恒星运动的回溯支持了这样一种观点，即本地气泡的起源是大约1400万年前在气泡中心附近发生的恒星诞生和死亡（超新星）的爆发。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，这个壳层现在已经破碎并坍塌成附近最突出的分子云，从而为超新星驱动的星星形成理论提供了强有力的观测支持。
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. Here we report an analysis of the three-dimensional positions, shapes and motions of dense gas and young stars within 200 pc of the Sun, using new spatial, –and dynamical constraints. We find that nearly all of 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 picture in which the origin of the Local Bubble was a burst of stellar birth and then death (supernovae) taking place near the bubble’s centre beginning approximately 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.