论文标题
太阳能社区中的银河级气波
A Galactic-scale gas wave in the Solar Neighborhood
论文作者
论文摘要
在过去的150年中，当地星际培养基（ISM）的普遍景观是基于一种被称为古尔德腰带的特殊性，这是一个不断扩大的年轻恒星，气体和尘埃的环，倾斜了约20 $^\ circ $ to to the Galactic平面。尽管如此，本地气体云之间的物理关系实际上仍然未知，因为与云的距离准确性相同或大于它们的尺寸。随着大型光度调查的出现和盖亚卫星的天文调查，这种情况发生了变化。在这里，我们报告了所有局部云配合物的3-D结构。我们发现在太阳能街区的狭窄而连贯的2.7 kpc排列，其中包含许多被认为与古尔德带有关的云层。这一发现与这些云是环的一部分，争论古尔德皮带模型的观念不一致。新结构包括附近的大部分恒星形成区域，其长宽比约为1:20，其中约有300万个太阳能气体。值得注意的是，新结构似乎是起伏的，其3-D分布通过银河系平面上的抑制正弦波很好地描述，平均周期约为2 kpc，最大幅度约为160 pc。我们的结果是修订局部气体分布和银河结构的第一步，并为分子气体转化为恒星的研究提供了更广泛的背景。
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.
