当前位置: X-MOL 学术Nat. Astron. › 论文详情
An intuitive 3D map of the Galactic warp’s precession traced by classical Cepheids
Nature Astronomy Pub Date : 2019-02-04 , DOI: 10.1038/s41550-018-0686-7
Xiaodian Chen, Shu Wang, Licai Deng, Richard de Grijs, Chao Liu, Hao Tian

The Milky Way’s neutral hydrogen (H i) disk is warped and flared1,2. However, a dearth of accurate H i-based distances has thus far prevented the development of an accurate Galactic Disk model. Moreover, the extent to which our Galaxy’s stellar and gas disk morphologies are mutually consistent is also unclear. Classical Cepheids, primary distance indicators with distance accuracies of 3–5% (ref. 3), offer a unique opportunity to develop an intuitive and accurate three-dimensional picture. Here, we establish a robust Galactic Disk model based on 1,339 classical Cepheids. We provide strong evidence that the warp’s line of nodes is not oriented in the Galactic Centre–Sun direction. Instead, it subtends a mean angle of 17.5° ± 1° (formal) ± 3° (systematic) and exhibits a leading spiral pattern. Our Galaxy thus follows Briggs’ rule for spiral galaxies4, which suggests that the origin of the warp is associated with torques forced by the massive inner disk5. The stellar disk traced by Cepheids follows the gas disk in terms of their amplitudes; the stellar disk extends to at least 20 kpc (refs. 6,7). This morphology provides a crucial, updated map for studies of the kinematics and archaeology of the Galactic Disk.

更新日期:2019-02-05

 

分享到
评论: 0
期刊列表
Springer Nature
浦江创新论坛
scientific reports
Nature中文内容
Nature 5 years
Scientific Reports特刊1
试剂库存
Scientific Reports特刊2
ACS Webinar
四川大学国家海外高层次人才
X-MOL编辑类职位
香港大学化学生物学与表观遗传实验室李祥课题组招聘启事
同济大学生命学院青年千人尹晓磊
浙江大学伊利诺伊大学
中山大学化学工程与技术学院诚聘腐蚀与防护相关专业人才
X-MOL文献直达记录功能上线
天合科研
2017年中科院JCR分区化学大类列表
化合物查询
down
wechat
bug