论文标题
发现Radcliffe波的连贯的，波浪状的速度模式
Discovery of a coherent, wave-like velocity pattern for the Radcliffe Wave
论文作者
论文摘要
最近的研究发现，一部分古尔德带属于由云链组成的2.7 kpc-long {相干，薄}波，其中已经从云的空间排列中鉴定出了阻尼的起伏图。我们使用锚定在云中的年轻恒星物体（YSO）的适当动作，以$ v_z $的形式研究Radcliffe波的运动学结构，并从$ V_Z $空间中识别出一种阻尼的，类似波浪的模式，我们调用“速度下降”。我们提出了一种基于集合经验模式分解（EEMD）的新形式主义，以确定起伏模式的振幅，周期和相位，并发现空间和速度畅通无阻的空间频率几乎相同的空间频率约为1.5 kpc，并且在从一侧到另一侧进行测量时都会减弱两者。在第一个周期测量的情况下，它们的相位差约为$2π/3 $。该结构正在以$ \ sim \，130 \，\ pm \，20 \，\ rm pc $的幅度为振幅，在银河系磁盘的中平面周围振荡。 Radcliffe波的垂直范围超过了分子盘的厚度，这表明起伏的签名的起伏可能源自扰动，例如矮星系的通道。
Recently studies discovered that part of the Gould Belt belongs to a 2.7 kpc-long {coherent, thin} wave consisting of a chain of clouds, where a damped undulation pattern has been identified from the spatial arrangement of the clouds. We use the proper motions of Young Stellar Objects (YSOs) anchored inside the clouds to study the kinematic structure of the Radcliffe Wave in terms of $v_z$, and identify a damped, wave-like pattern from the $v_z$ space, which we call "velocity undulation". We propose a new formalism based on the Ensemble Empirical Mode Decomposition (EEMD) to determine the amplitude, period, and phase of the undulation pattern, and find that the spatial and the velocity undulation share an almost identical spatial frequency of about 1.5 kpc, and both are damped when measured from one side to the other. Measured for the first cycle, they exhibit a phase difference of around $2π/3$. The structure is oscillating around the midplane of the Milky Way disk with an amplitude of $\sim\,130\,\pm\,20\,\rm pc$. The vertical extent of the Radcliffe Wave exceeds the thickness of the molecular disk, suggesting that the undulation of the undulation signature might originate from a perturbation, e.g. the passage of a dwarf galaxy.
