thespiralstructureofthemilkyway

	thespiralstructureofthemilkyway
	Xu Ye1 ; Hou Ligang 2; Wu Yuanwei 3
刊名	researchinastronomyandastrophysics
	2018
卷号	18 期号:12 页码:9
ISSN号	1674-4527
英文摘要	The 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.
语种	英语
内容类型	期刊论文
源URL	[http://libir.pmo.ac.cn/handle/332002/31800]
专题	中国科学院紫金山天文台
作者单位	1.中国科学院紫金山天文台 2.中国科学院国家天文台 3.中国科学院国家授时中心
推荐引用方式 GB/T 7714	Xu Ye,Hou Ligang,Wu Yuanwei. thespiralstructureofthemilkyway[J]. researchinastronomyandastrophysics,2018,18(12):9.
APA	Xu Ye,Hou Ligang,&Wu Yuanwei.(2018).thespiralstructureofthemilkyway.researchinastronomyandastrophysics,18(12),9.
MLA	Xu Ye,et al."thespiralstructureofthemilkyway".researchinastronomyandastrophysics 18.12(2018):9.