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The spiral structure of the Milky Way
Xu, Ye1; Hou, Li-Gang2,3; Wu, Yuan-Wei4
2018-12-01
Source PublicationRESEARCH IN ASTRONOMY AND ASTROPHYSICS
ISSN1674-4527
Volume18Issue:12Pages:20
Corresponding AuthorXu, Ye(xuye@pmo.ac.cn)
AbstractThe morphology and kinematics of the spiral structure of the Milky Way are long-standing problems in astrophysics. In this review we firstly summarize variousmethodswith different tracers used to solve this puzzle. The astrometry of Galactic sources is gradually alleviating this difficult situation caused mainly by large distance uncertainties, as we can currently obtain accurate parallaxes (a few mu as) and proper motions (approximate to 1 kms(-1)) by using Very Long Baseline Interferometry (VLBI). On the other hand, the Gaia mission is providing the largest, uniform sample of parallaxes for O-type stars in the entire Milky Way. Based upon the VLBI maser and Gaia O-star parallax measurements, nearby spiral structures of the Perseus, Local, Sagittarius and Scutum Arms are determined in unprecedented detail. Meanwhile, we estimate fundamental Galactic parameters of the distance to the Galactic center, R-0, to be 8.35 +/- 0.18 kpc, and circular rotation speed at the Sun, theta(0), to be 240 +/- 10 kms(-1). We found kinematic differences between O stars and interstellar masers: the O stars, on average, rotate faster, > 8 kms(-1) than maser-traced high-mass star forming regions.
KeywordGalaxy: structure Galaxy: kinematics and dynamics masers techniques: high Galaxy: structure Galaxy: kinematics and dynamics masers techniques: high angular resolution astrometry stars: formationangular resolution astrometry stars: formation
DOI10.1088/1674-4527/18/12/146
WOS KeywordSTAR-FORMING REGION ; H-II REGIONS ; MOLECULAR CLOUD COMPLEXES ; RECONSTRUCTING CO MAPS ; TRIGONOMETRIC PARALLAXES ; OPEN CLUSTERS ; OUTER GALAXY ; 3-DIMENSIONAL DISTRIBUTION ; PHYSICAL-PROPERTIES ; GALACTIC STRUCTURE
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000454953800002
PublisherNATL ASTRONOMICAL OBSERVATORIES, CHIN ACAD SCIENCES
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Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/20488
Collection中国科学院紫金山天文台
Corresponding AuthorXu, Ye
Affiliation1.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
2.Chinese Acad Sci, CAS Key Lab FAST, Natl Astron Observ, Beijing 100101, Peoples R China
3.Chinese Acad Sci, Natl Astron Observ, Beijing 100101, Peoples R China
4.Chinese Acad Sci, Natl Time Serv Ctr, Key Lab Precise Positioning & Timing Technol, Xian 710600, Shaanxi, Peoples R China
Recommended Citation
GB/T 7714
Xu, Ye,Hou, Li-Gang,Wu, Yuan-Wei. The spiral structure of the Milky Way[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2018,18(12):20.
APA Xu, Ye,Hou, Li-Gang,&Wu, Yuan-Wei.(2018).The spiral structure of the Milky Way.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,18(12),20.
MLA Xu, Ye,et al."The spiral structure of the Milky Way".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 18.12(2018):20.
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