论文标题
红色团星追踪的局部螺旋结构
Local Spiral Structure Traced by Red Clump Stars
论文作者
论文摘要
使用GAIA EDR3和2MASS点源目录的交叉匹配数据，鉴定出具有视差准确性的RC恒星的样本比20％的样本被鉴定出来，并用于揭示附近的螺旋模式，该螺旋模式由老恒星追踪。如RC恒星的过度密度分布所示，有一个类似弧形的功能从$ l〜 \ sim $ 90 $^\ circ $到$ \ sim $ \ sim $ 243 $^\ circ $，它通过了太阳。此功能可能是旧星星所追踪的手臂段，表明在太阳附近的星系电势。通过将年轻物体描绘的螺旋臂进行比较，我们发现银河螺旋臂的两个不同组成部分之间存在相当大的偏移。由RC恒星追踪的螺旋臂往往具有更大的音高角度，因此伤口模式更松。
Using the cross-matched data of Gaia EDR3 and the 2MASS Point Source Catalog, a sample of RC stars with parallax accuracies better than 20% is identified and used to reveal the nearby spiral pattern traced by old stars. As shown in the overdensity distribution of RC stars, there is an arc-like feature extended from $l~\sim$ 90$^\circ$ to $\sim$ 243$^\circ$, which passed close to the Sun. This feature is probably an arm segment traced by old stars, indicating the Galaxy potential in the vicinity of the Sun. By comparing to the spiral arms depicted by young objects, we found that there are considerable offsets between the two different components of Galactic spiral arms. The spiral arm traced by RC stars tends to have a larger pitch angle, hence a more loose wound pattern.
