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arXiv 2110.04446astro-ph.GA
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太阳系附近的螺旋结构

The spiral structure in the Solar neighborhood

L. G. Hou

摘要:

太阳附近的螺旋结构是天文学中的一个重要问题。在过去几年中,在观察方面取得了重大进展。大量的好的旋臂示踪物,即巨分子云、大质量恒星形成区脉泽、HII区、O型星和年轻的疏散星团的距离已经得到精确的估计,从而有可能描绘出附近旋臂的详细性质。本文首先综述了基于不同类型示踪剂的银河系螺旋结构的研究现状。然后收集距离不确定度小于15%的天体和$<$ 0. 5 kpc的天体,并将其组合在一起,描绘出太阳邻域的螺旋结构。追踪到与英仙座、本星系、人马座-船底座、盾牌座-半人马座和诺玛臂有关的五个部分。利用大数据集,拟合和更新邻近臂段的参数。除了主要的旋臂外,一些可能与臂距或羽毛有关的亚结构也被注意到并进行了讨论。

英文摘要:

The spiral structure in the Solar neighborhood is an important issue in astronomy. In the past few years, there is significant progress in observation. The distances for a large number of good spiral tracers, i.e. giant molecular clouds, high-mass star-formation region masers, HII regions, O-type stars and young open clusters, have been accurately estimated, making it possible to depict the detailed properties of nearby spiral arms. In this work, we first give an overview about the research status for the Galaxy's spiral structure based on different types of tracers. Then the objects with distance uncertainties better than 15\% and $<$0.5 kpc are collected and combined together to depict the spiral structure in the Solar neighborhood. Five segments related with the Perseus, Local, Sagittarius-Carina, Scutum-Centaurus and Norma Arms are traced. With the large dataset, the parameters of the nearby arm segments are fitted and updated. Besides the dominant spiral arms, some substructures probably related to arm spurs or feathers are also noticed and discussed.

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