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题名:
The nearby spiral density-wave structure of the Galaxy: Line-of-sight and longitudinal velocities of 61 masers
作者: Griv, E.1; Jiang, I. -G.2; Hou, L. -G.3; Ngeow, C. -C.4
关键词: Galaxy: kinematics and dynamics ; Galaxy: structure ; galaxies: spiral
刊名: ASTRONOMISCHE NACHRICHTEN
发表日期: 2017-07-01
DOI: 10.1002/asna.201713150
卷: 338, 期:6, 页:729-739
文章类型: Article
收录类别: SCI
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Astronomy & Astrophysics
研究领域[WOS]: Astronomy & Astrophysics
关键词[WOS]: GALACTIC ROTATION CURVE ; MILKY-WAY-GALAXY ; DISK GALAXIES ; OPEN CLUSTERS ; STELLAR KINEMATICS ; UNSTABLE MODES ; YOUNG STARS ; OWN GALAXY ; ARMS ; PARAMETERS
英文摘要: This paper is the eighth in a series presenting the results of the dynamical analysis of velocity fields of Galactic objects on the assumption that the system is subject to moderately unstable, low-amplitude, tightly wound, and rigidly rotating Lin-Shu density waves. The data of 61 masers associated with star-forming regions having distances d<4 kpc from the Sun and h<200 pc from the plane are collected from the work by Reid et al. Both line-of-sight v(los) and transverse along the Galactic longitude v(l)velocities of these objects are analyzed. It is shown that there may coexist at least two radial scales of irregularity of a velocity field with different wavelengths approximate to 2 and approximate to 3.5 kpc and amplitudes of the perturbed gravitational potential for all values of the number of spiral arms considered, m = 1, 2, 3, and 4. To be consistent with the current ideas as to the spiral structure of the Galaxy, we argue respectively that the Sun is located at the inner edge of the Cygnus-Orion arm (very close to the arm center), between the nearby inner Carina-Sagittarius and outer Perseus arms (closer to the inner one). Estimates obtained from an analysis of two independent velocities v(los) and v(l) are fairly consistent. As for us, the latter establishes further evidence to support the Lin-Shu wave proposal.
语种: 英语
项目资助者: Israel Science Foundation ; Israeli Ministry of Immigrant Absorption ; Binational U.S.-Israel Science Foundation ; Ministry of Science and Technology in Taiwan ; National Natural Science Foundation of China(11503033)
WOS记录号: WOS:000408308300010
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内容类型: 期刊论文
URI标识: http://ir.bao.ac.cn/handle/114a11/20144
Appears in Collections:射电天文研究部_期刊论文

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作者单位: 1.Ben Gurion Univ Negev, Dept Phys, POB 653, IL-84105 Beer Sheva, Israel
2.Natl Tsing Hua Univ, Dept Phys, Hsinchu, Taiwan
3.Chinese Acad Sci, Natl Astron Observ, Beijing, Peoples R China
4.Natl Cent Univ, Grad Inst Astron, Jhongli, Taiwan

Recommended Citation:
Griv, E.,Jiang, I. -G.,Hou, L. -G.,et al. The nearby spiral density-wave structure of the Galaxy: Line-of-sight and longitudinal velocities of 61 masers[J]. ASTRONOMISCHE NACHRICHTEN,2017,338(6):729-739.
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