论文标题
使用Gaia早期数据版本3更新了本地组矮星系的适当动作
Updated proper motions for Local Group dwarf galaxies using Gaia Early Data Release 3
论文作者
论文摘要
根据GAIA早期数据版本3（EDR3），对58个银河系卫星星系的更新的系统性适当估计值。该样本与McConnachie＆Venn（2020）研究的样本相同，该方法基本上与原始论文没有变化。 Gaia Edr3与Gaia数据版本2相比的优势意味着Bo {Ö} TES 4，Cetus 3，Pegasus 3和处女座1首次具有可检测的全身性运动。对于整个星系样本，系统正确运动中的中值随机不确定性大约比使用Gaia DR2的先前估计值大约要好两个。相关的系统误差，这也是两个较小的因素，在样本中的58个对象中有25个在随机不确定性上占主导地位。
Updated systemic proper motion estimates for 58 Milky Way satellite galaxies, based on Gaia Early Data Release 3 (EDR3), are provided. This sample is identical to that studied by McConnachie & Venn (2020) and the methodology is essentially unchanged from the original paper. The superiority of Gaia EDR3 compared to Gaia Data Release 2 means that Bo{ö}tes 4, Cetus 3, Pegasus 3 and Virgo 1 have detectable systemic proper motions for the first time. For the entire galaxy sample, the median random uncertainties in the systemic proper motions are approximately a factor of two better than the previous estimates using Gaia DR2. Relevant systematic errors, which are also a factor of two smaller, dominate over random uncertainties for 25 out of the 58 objects in the sample.
