拉德克利夫波的相干波状速度模式的发现
Discovery of a coherent, wave-like velocity pattern for the Radcliffe Wave
摘要：
最近的研究发现，古尔德带的一部分属于一个2.7kpc长的{相干，薄}波，由一个云链组成，其中阻尼波动模式已被确定从云的空间布局。我们使用自行的年轻恒星对象（YSO）锚定在云层中研究拉德克利夫波的运动学结构的$v_z$，并确定一个阻尼，波状图案从$v_z$空间，我们称之为“速度波动”。我们提出了一个新的形式主义的基础上的包围经验模态分解（EEMD），以确定的振幅，周期和相位的波动模式，并发现，空间和速度波动共享几乎相同的空间频率约1.5千秒差距，和两者都是阻尼测量时，从一侧到另一侧。对于第一个循环测量，它们表现出大约$2π/3$的相位差。该结构围绕银河系盘的中平面振荡，振幅为$\sim\,130\,\pm\,20\,\rm pc$。拉德克利夫波的垂直范围超过了分子盘的厚度，这表明波动签名的波动可能源于扰动，例如矮星系的通过。
英文摘要：
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.
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