arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2001.08748astro-ph.GAastro-ph.SR
收藏

太阳附近的银河系尺度气体波

A Galactic-scale gas wave in the Solar Neighborhood

João Alves, Catherine Zucker, Alyssa A. Goodman, Joshua S. Speagle, Stefan Meingast, Thomas Robitaille, Douglas P. Finkbeiner, Edward F. Schlafly, Gregory M. Green

摘要:

在过去的150年里,当地星际介质(ISM)的主流观点是基于一个被称为古尔德带的特殊性,这是一个由年轻恒星、气体和尘埃组成的膨胀环,向银河平面倾斜约20 $^\circ$。尽管如此,局部气体云之间的物理关系实际上仍然是未知的,因为云的距离精度与它们的大小相同或更大。随着大型测光测量和盖亚卫星天体测量测量的出现,这种情况发生了变化。在这里,我们报告的3-D结构的所有本地云复合体。我们在太阳附近发现了一个狭窄而连贯的2.7 kpc致密气体排列,其中包含许多被认为与古尔德带有关的云。这一发现与认为这些云是环的一部分的观点不一致,对古尔德带模型提出了质疑。新的结构包括附近的大部分恒星形成区,长宽比约为1:20,含有约300万太阳质量的气体。值得注意的是,新的结构似乎是起伏的,其三维分布是很好地描述了阻尼正弦波的平面上的银河系,平均周期约为2千秒差距,最大振幅约为160秒差距。我们的研究结果代表了第一步的本地气体分布和银河系结构的修订,并提供了一个新的,更广泛的背景下,研究转化为恒星的分子气体。

英文摘要:

For the past 150 years, the prevailing view of the local Interstellar Medium (ISM) was based on a peculiarity known as the Gould's Belt, an expanding ring of young stars, gas, and dust, tilted about 20$^\circ$ to the Galactic plane. Still, the physical relation between local gas clouds has remained practically unknown because the distance accuracy to clouds is of the same order or larger than their sizes. With the advent of large photometric surveys and the Gaia satellite astrometric survey this situation has changed. Here we report the 3-D structure of all local cloud complexes. We find a narrow and coherent 2.7 kpc arrangement of dense gas in the Solar neighborhood that contains many of the clouds thought to be associated with the Gould Belt. This finding is inconsistent with the notion that these clouds are part of a ring, disputing the Gould Belt model. The new structure comprises the majority of nearby star-forming regions, has an aspect ratio of about 1:20, and contains about 3 million solar masses of gas. Remarkably, the new structure appears to be undulating and its 3-D distribution is well described by a damped sinusoidal wave on the plane of the Milky Way, with an average period of about 2 kpc and a maximum amplitude of about 160 pc. Our results represent a first step in the revision of the local gas distribution and Galactic structure and offer a new, broader context to studies on the transformation of molecular gas into stars.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑