论文标题
60个候选高速星，源自射手座矮人球形星系
60 candidate high-velocity stars originating from the Sagittarius dwarf spheroidal galaxy in Gaia EDR3
论文作者
论文摘要
使用Gaia早期数据版本3（Gaia EDR 3）的适当运动和来自多个调查的径向速度，我们通过眶式分析确定了60个候选高速恒星，总速度大于75 \％逃逸速度，可能是来自Sagittarius Dwarf Spheroidal Galaxy（SGR）的逃逸速度。 SGR的重力对结果几乎没有影响，而大麦哲伦云的重力仅对几颗恒星具有不可忽略的影响。当SGR通过其候选物（$ \ sim $ 38.2 Myr Ago）时，这些恒星最接近SGR的方法发生在SGR上，这表明它们是从SGR中撤离的。这些恒星在人力资源图中的位置以及其中19个具有可用[Fe/H]的化学性质与SGR流构件星相似。这与它们积聚起源的假设一致。 60个中有两个是高速恒星，这也可能是由山丘机制产生的。
Using proper motions from Gaia Early Data Release 3 (Gaia EDR 3) and radial velocities from several surveys, we identify 60 candidate high-velocity stars with total velocity greater than 75\% escape velocity that probably origin from Sagittarius dwarf spheroidal galaxy (Sgr) by orbital analysis. Sgr's gravity has little effect on the results and the Large Magellanic Cloud's gravity has non-negligible effect on only a few stars. The closest approach of these stars to the Sgr occurs when the Sgr passed its pericenter ($\sim$ 38.2 Myr ago), which suggest they were tidally stripped from the Sgr. The positions of these stars in the HR diagram and the chemical properties of 19 of them with available [Fe/H] are similar with the Sgr stream member stars. This is consistent with the assumption of their accretion origin. Two of the 60 are hypervelocity stars, which may also be produced by Hills mechanism.
