The Per-Tau Shell: A Giant Star-forming Spherical Shell Revealed by 3D Dust Observations
The Per-Tau Shell: A Giant Star-forming Spherical Shell Revealed by 3D Dust Observations
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DOI：
10.3847/2041-8213/ac1f95
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发表时间：
2021-09
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影响因子：
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通讯作者：
S. Bialy;C. Zucker;A. Goodman;M. Foley;J. Alves;V. Semenov;R. Benjamin;R. Leike;T. Enßlin
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作者：
S. Bialy;C. Zucker;A. Goodman;M. Foley;J. Alves;V. Semenov;R. Benjamin;R. Leike;T. Enßlin
星星形成领域的一个主要问题是分子云是如何从弥漫的星际介质（ISM）中形成的。3D尘埃测绘的最新进展正在彻底改变我们对ISM结构的看法。使用迄今为止分辨率最高的3D尘埃图，我们探索了附近恒星形成区域的结构，其中包括着名的英仙座和金牛座分子云。我们揭示了一个扩展的近球形壳，156 pc的直径（以下称为“Per-Tau壳”），英仙座和金牛座的云嵌入其中。我们还在金牛座的位置发现了一个大的环状结构（以下称为“Tau环”）。我们讨论了Per-Tau壳的形成情景，在这种情景中，先前的恒星和超新星反馈事件形成了一个巨大的膨胀壳，在那里，掠起的ISM凝聚形成了壳和英仙座和金牛座分子云。我们提供了H i，Hα，26 Al和X射线的辅助观测，进一步支持了这一情景，并估计Per-Tau壳的年龄为1.6 -22亿年。Per-Tau壳提供了第一个长期假设理论现象的3D观测视图，分子云形成和星星形成由以前的恒星和超新星反馈触发。
A major question in the field of star formation is how molecular clouds form out of the diffuse interstellar medium (ISM). Recent advances in 3D dust mapping are revolutionizing our view of the structure of the ISM. Using the highest-resolution 3D dust map to date, we explore the structure of a nearby star-forming region, which includes the well-known Perseus and Taurus molecular clouds. We reveal an extended near-spherical shell, 156 pc in diameter (hereafter called the “Per-Tau Shell”), in which the Perseus and Taurus clouds are embedded. We also find a large ring structure at the location of Taurus (hereafter called the “Tau Ring”). We discuss a formation scenario for the Per-Tau Shell, in which previous stellar and supernova feedback events formed a large expanding shell, where the swept-up ISM has condensed to form both the shell and the Perseus and Taurus molecular clouds within it. We present auxiliary observations of H i, Hα, 26Al, and X-rays that further support this scenario, and estimate the Per-Tau Shell’s age to be ≈6–22 Myrs. The Per-Tau shell offers the first 3D observational view of a phenomenon long-hypothesized theoretically, molecular cloud formation and star formation triggered by previous stellar and supernova feedback.