论文标题
Gaia DR2中垂直呼吸运动的年龄解剖：螺旋驾驶的证据
Age dissection of the vertical breathing motions in Gaia DR2: evidence for spiral driving
论文作者
论文摘要
Gaia Dr2以银河系的方式揭示了呼吸动作，银河中部平面两侧的恒星连贯地向或远离它。这些呼吸运动的生成机制被认为是螺旋密度波。在这里，我们检验了这一假设。我们使用恒星形成的自洽，高分辨率的模拟，并主持着突出的螺旋，我们首先研究了螺旋式兴奋的呼吸运动的特征。在模型中，螺旋结构引起的呼吸运动的幅度增加，距离中间平面的距离指向它们的内部原因。然后，我们表明，在固定高度下，呼吸幅度随着年龄的增长而降低。接下来，我们研究Gaia DR2数据集中呼吸运动的签名。我们证明，与模型一致的位置，在呼吸运动始终如一的位置，相应的振幅与距离中平面的距离单调增加。此外，我们表明，在同一位置，呼吸运动振幅随着年龄的增长而降低，再次类似于我们在模型中发现的。这加强了观察到的呼吸运动由螺旋密度波驱动的情况。
Gaia DR2 has revealed breathing motions in the Milky Way, with stars on both sides of the Galactic mid-plane moving coherently towards or away from it. The generating mechanism of these breathing motions is thought to be spiral density waves. Here we test this hypothesis. Using a self-consistent, high-resolution simulation with star formation, and which hosts prominent spirals, we first study the signatures of breathing motions excited by spirals. In the model, the breathing motions induced by the spiral structure have an increasing amplitude with distance from the mid-plane, pointing to an internal cause for them. We then show that, at fixed height, the breathing motion amplitude decreases with age. Next, we investigate the signature of the breathing motions in the Gaia DR2 dataset. We demonstrate that, at the location with a consistently large breathing motion, the corresponding amplitude increases monotonically with distance from the mid-plane, in agreement with the model. Furthermore, we show that at the same location, the breathing motion amplitude decreases with age, again similar to what we find in the model. This strengthens the case that the observed breathing motions are driven by spiral density waves.
