Stellar Stream Candidates in the Solar Neighborhood Found in the LAMOST DR3 and TGAS
Stellar Stream Candidates in the Solar Neighborhood Found in the LAMOST DR3 and TGAS
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LAMOST DR3 和 TGAS 中发现太阳系附近的恒星流候选者
DOI：
10.3847/1538-4357/aa7cf7
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发表时间：
2017
影响因子：
4.9
通讯作者：
Zhao G.
中科院分区：
文献类型：
--
作者：
Liang X. L.;Zhao J. K.;Oswalt T. D.;Chen Y. Q.;Zhang L.;Zhao G.
我们将LAMOST DR 3与Gaia DR 1 TGAS目录进行了交叉匹配，并获得了166，827颗具有可靠运动学的恒星样本。基于小波变换的技术被施加到检测显着的超密度在速度空间中的五个子样本划分的空间位置。总共发现了16颗运动学非常相似的恒星。其中，四个是新的流候选，其余的是先前已知的组。本地样品的U-V速度分布和金属丰度分布都显示出武仙座结构和Hyades-Pleiades结构之间的明显差距。这些峰的U-V位置随着空间位置而移动。在描述了我们的分析之后，我们推测了我们的候选流的可能起源。
We have cross-matched the LAMOST DR3 with the Gaia DR1 TGAS catalogs and obtained a sample of 166,827 stars with reliable kinematics. A technique based on the wavelet transform was applied to detect significant overdensities in velocity space among five subsamples divided by spatial position. In total, 16 significant overdensities of stars with very similar kinematics were identified. Among these, four are new stream candidates and the rest are previously known groups. Both the U–V velocity and metallicity distributions of the local sample show a clear gap between the Hercules structure and the Hyades–Pleiades structure. The U–V positions of these peaks shift with the spatial position. Following a description of our analysis, we speculate on possible origins of our stream candidates.