The Spiral Arm Segments of the Galaxy within 3 kpc from the Sun: A Statistical Approach

doi:10.3847/1538-4357/aa7b37

	The Spiral Arm Segments of the Galaxy within 3 kpc from the Sun: A Statistical Approach
	Hou, Li-Gang3 ; Griv, Evgeny 1; Jiang, Ing-Guey 2
刊名	ASTROPHYSICAL JOURNAL
	2017-08-01
卷号	844 期号:2
关键词	Galaxies: Kinematics And Dynamics Galaxies: Structure Galaxy: Structure
DOI	10.3847/1538-4357/aa7b37
文献子类	Article
英文摘要	As can be reasonably expected, upcoming large-scale APOGEE, GAIA, GALAH, LAMOST, and WEAVE stellar spectroscopic surveys will yield rather noisy Galactic distributions of stars. In view of the possibility of employing these surveys, our aim is to present a statistical method to extract information about the spiral structure of the Galaxy from currently available data, and to demonstrate the effectiveness of this method. The model differs from previous works studying how objects are distributed in space in its calculation of the statistical significance of the hypothesis that some of the objects are actually concentrated in a spiral. A statistical analysis of the distribution of cold dust clumps within molecular clouds, H II regions, Cepheid stars, and open clusters in the nearby Galactic disk within 3 kpc from the Sun is carried out. As an application of the method, we obtain distances between the Sun and the centers of the neighboring Sagittarius arm segment, the Orion arm segment in which the Sun is located, and the Perseus arm segment. Pitch angles of the logarithmic spiral segments and their widths are also estimated. The hypothesis that the collected objects accidentally form spirals is refuted with almost 100% statistical confidence. We show that these four independent distributions of young objects lead to essentially the same results. We also demonstrate that our newly deduced values of the mean distances and pitch angles for the segments are not too far from those found recently by Reid et al. using VLBI-based trigonometric parallaxes of massive star-forming regions.
WOS关键词	STAR-FORMING REGIONS ; DENSITY-WAVE STRUCTURE ; MILKY-WAY ; TRIGONOMETRIC PARALLAXES ; GALACTIC DISK ; LAMOST ; VELOCITIES ; DISTANCES ; CLUSTERS ; HYDROGEN
WOS研究方向	Astronomy & Astrophysics
语种	英语
WOS记录号	WOS:000406476400007
资助机构	Ministry of Science and Technology in Taiwan ; Ministry of Science and Technology in Taiwan ; Israel Science Foundation ; Israel Science Foundation ; Binational U.S.-Israel Science Foundation ; Binational U.S.-Israel Science Foundation ; National Natural Science Foundation of China(11503033) ; National Natural Science Foundation of China(11503033) ; Ministry of Science and Technology in Taiwan ; Ministry of Science and Technology in Taiwan ; Israel Science Foundation ; Israel Science Foundation ; Binational U.S.-Israel Science Foundation ; Binational U.S.-Israel Science Foundation ; National Natural Science Foundation of China(11503033) ; National Natural Science Foundation of China(11503033)
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/20080]
专题	国家天文台_射电天文研究部
作者单位	1.Ben Gurion Univ Negev, Dept Phys, IL-84105 Beer Sheva, Israel 2.Natl Tsing Hua Univ, Dept Phys, Kuang Fu Rd 101, Hsinchu 30013, Taiwan 3.Chinese Acad Sci, Natl Astron Observ, Jia 20, Beijing 100012, Peoples R China
推荐引用方式 GB/T 7714	Hou, Li-Gang,Griv, Evgeny,Jiang, Ing-Guey. The Spiral Arm Segments of the Galaxy within 3 kpc from the Sun: A Statistical Approach[J]. ASTROPHYSICAL JOURNAL,2017,844(2).
APA	Hou, Li-Gang,Griv, Evgeny,&Jiang, Ing-Guey.(2017).The Spiral Arm Segments of the Galaxy within 3 kpc from the Sun: A Statistical Approach.ASTROPHYSICAL JOURNAL,844(2).
MLA	Hou, Li-Gang,et al."The Spiral Arm Segments of the Galaxy within 3 kpc from the Sun: A Statistical Approach".ASTROPHYSICAL JOURNAL 844.2(2017).