Radial distribution of stellar motions in Gaia DR2
Radial distribution of stellar motions in Gaia DR2
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DOI：
10.1093/mnrasl/sly107
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发表时间：
2018-04
影响因子：
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通讯作者：
D. Kawata;J. Baba;I. Ciucă;M. Cropper;R. Grand;Jason A. S. Hunt;G. Seabroke
中科院分区：
文献类型：
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作者：
D. Kawata;J. Baba;I. Ciucă;M. Cropper;R. Grand;Jason A. S. Hunt;G. Seabroke
通过利用 Gaia DR2 提供的对前所未有的大量恒星的位置和速度的出色测量，我们生成了第一张旋转速度 V_{rot} 和垂直速度 V_{z} 的分布图，其分布作为银河中心半径 R_{gal} 的函数，径向范围为 5 < R_{gal} < 12 kpc。在 R − V_{rot} 图中，我们识别出了许多对角脊特征，并将其与旋臂的位置和预期的银河棒外林德布拉德共振进行了比较。我们还检测到垂直速度分布峰值的径向波状振荡。
By taking advantage of the superb measurements of position and velocity for an unprecedented large number of stars provided in Gaia DR2, we have generated the first maps of the rotation velocity, V_{rot}, and vertical velocity, V_{z}, distributions as a function of the Galactocentric radius, R_{gal}, across a radial range of 5 < R_{gal} < 12 kpc. In the R − V_{rot} map, we have identified many diagonal ridge features, which are compared with the location of the spiral arms and the expected outer Lindblad resonance of the Galactic bar. We have detected also radial wave-like oscillations of the peak of the vertical velocity distribution.