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The Spiral Arm Segments of the Galaxy within 3 kpc from the Sun: A Statistical Approach
Griv, Evgeny1; Jiang, Ing-Guey2; Hou, Li-Gang3
2017-08-01
Source PublicationASTROPHYSICAL JOURNAL
Volume844Issue:2
AbstractAs 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.
SubtypeArticle
KeywordGalaxies: Kinematics And Dynamics Galaxies: Structure Galaxy: Structure
WOS HeadingsScience & Technology ; Physical Sciences
Funding OrganizationMinistry 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)
DOI10.3847/1538-4357/aa7b37
WOS KeywordSTAR-FORMING REGIONS ; DENSITY-WAVE STRUCTURE ; MILKY-WAY ; TRIGONOMETRIC PARALLAXES ; GALACTIC DISK ; LAMOST ; VELOCITIES ; DISTANCES ; CLUSTERS ; HYDROGEN
Indexed BySCI
Language英语
Funding OrganizationMinistry 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)
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000406476400007
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/20080
Collection射电天文研究部
Affiliation1.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
Recommended Citation
GB/T 7714
Griv, Evgeny,Jiang, Ing-Guey,Hou, Li-Gang. The Spiral Arm Segments of the Galaxy within 3 kpc from the Sun: A Statistical Approach[J]. ASTROPHYSICAL JOURNAL,2017,844(2).
APA Griv, Evgeny,Jiang, Ing-Guey,&Hou, Li-Gang.(2017).The Spiral Arm Segments of the Galaxy within 3 kpc from the Sun: A Statistical Approach.ASTROPHYSICAL JOURNAL,844(2).
MLA Griv, Evgeny,et al."The Spiral Arm Segments of the Galaxy within 3 kpc from the Sun: A Statistical Approach".ASTROPHYSICAL JOURNAL 844.2(2017).
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