论文标题
盖亚DR2太阳能社区的高速移动组
High-velocity moving groups in the Solar neighborhood in Gaia DR2
论文作者
论文摘要
我们使用改进的小波分析技术来重建$ \ sim 250000 $的$ \ sim速度分布的$（u，v，w），来自Gaia Dr2，居住在$ 200 $ 〜PC的太阳能社区。研究了三个双变量分布$（u，v）$，$（u，w）$和$（v，w）$的2D小波变换。尽管在这些图中，大多数当前已知的（低速）恒星移动组密集地重叠，但我们的分析允许检测和解散速度高的3D组恒星的大约二十个具有较高速度的恒星。他们中的大多数看起来很新。我们还讨论了小波转换中正确的噪声阈值的问题，并突出了使用全局而不是局部统计量的重要性。由于多次测试的效果，使用局部显着性度量可能会导致单个模式的统计置信度过高。
We use an improved wavelet analysis technique to reconstruct the $(U,V,W)$ velocity distribution for $\sim 250000$ stars from Gaia DR2, residing in the solar neighborhood of $200$~pc. The 2D wavelet transforms for three bivariate distributions $(U,V)$, $(U,W)$, and $(V,W)$ were investigated. Though most of currently known (low-velocity) stellar moving groups are densely overlapped in these diagrams, our analysis allowed to detect and disentangle about twenty statistically significant 3D groups of stars with high velocities. Most of them appear new. We also discuss the issue of correct noise thresholding in the wavelet transform and highlight the importance of using a global rather than local statistic for that. Using of a local significance measure may lead to an overstated statistical confidence for individual patterns due to the effect of multiple testing.
