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首页> 外文期刊>The astronomical journal >Radial Velocity Comparison of Gaia DR2 and RAVE DR5 Survey: A Systematic Offset in Radial Velocities among a Group of Highly Accurate Radial Velocity Stars
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Radial Velocity Comparison of Gaia DR2 and RAVE DR5 Survey: A Systematic Offset in Radial Velocities among a Group of Highly Accurate Radial Velocity Stars

机译：盖亚DR2和RAVE DR5测量的径向速度比较：一组高精度径向速度恒星中径向速度的系统偏移

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Here, we report a comparative study of radial velocity (RV) data of two major surveys: Gaia Data Release 2 and RAVE Data Release 5. We restricted the sample to stars with relatively accurate RVs (sRVGaia ? 2 km s?1 or ?2%, and sRVRAVE ? 2 km s?1 or ?2%). The difference between RVGaia and RVRAVE for a majority of the sample follows a normal distribution with mean?=?0.28 km s?1 and σ?=?1.49 km s?1. However, we found a very small group of stars (≈0.08% of the total) for which the difference in RVs between the two surveys is significantly larger with an offset of ?104.50 km s?1 with σ?=?4.92 km s?1. Kinematics based on RVGaia suggest that most of the group members belong to the Galactic thin disk, which agrees with the group’s metallicity range of ?1.2 to +0.5 dex suggesting the offset in RV is probably due to RAVE velocity data for this particular group.
机译：在这里，我们报告了两项主要测量的径向速度（RV）数据的比较研究：盖亚数据发布2和RAVE数据发布5。我们将样本限制为具有相对准确RVs的恒星（sRVGaia？2 km s？1或？2 sRVRAVE？2 km s？1或？2％）。对于大多数样本，RVGaia和RVRAVE之间的差异遵循正态分布，均值= 0.28 km s？1和σ？1.49 km s？1。但是，我们发现了一组很小的恒星（占总数的0.08％），两次调查之间的RV差值明显更大，偏移量为？104.50 km s？1，σ？=？4.92 km s？ 1。基于RVGaia的运动学表明，该小组的大多数成员都属于银河薄盘，这与该小组的金属度范围为1.2至+0.5 dex一致，表明RV的偏移可能是由于该特定小组的RAVE速度数据所致。

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