盖亚DR2太阳邻域的高速运动群

IF 2 4区 物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS Acta Astronomica Pub Date : 2020-06-01 DOI:10.32023/0001-5237/70.2.4
R. Baluev, V. Shaidulin, A. V. Veselova
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引用次数: 2

摘要

我们使用改进的小波分析技术来重建盖亚DR2的$\sim 250000美元恒星的$(U,V,W)$速度分布,这些恒星位于200美元~个的太阳邻域。研究了三个二元分布$(U,V)$、$(U、W)$和$(V,W)$的二维小波变换。尽管目前已知的大多数(低速)恒星运动群在这些图中密集重叠,但我们的分析允许检测和解开大约20个具有统计意义的高速3D恒星群。它们中的大多数看起来都是新的。我们还讨论了小波变换中正确的噪声阈值问题,并强调了使用全局统计而不是局部统计的重要性。由于多重测试的影响,使用局部显著性测量可能会导致个体模式的统计置信度过高。
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High-Velocity Moving Groups in the Solar Neighborhood in Gaia DR2
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.
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来源期刊
Acta Astronomica
Acta Astronomica 地学天文-天文与天体物理
CiteScore
3.40
自引率
4.50%
发文量
0
审稿时长
>12 weeks
期刊介绍: Information not localized
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